diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..beffa30
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,11 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 0000000..8493529
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,3 @@
+tmp
+node_modules/
+.git
diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..de3a642
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,11 @@
+{
+  "extends": "groupon",
+  "overrides": [
+    {
+      "files": "*.test.js",
+      "env": {
+        "mocha": true
+      }
+    }
+  ]
+}
diff --git a/.gitignore b/.gitignore
index 3c3629e..0e6f9ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,6 @@
-node_modules
+/.nyc_output
+node_modules/
+npm-debug.log
+/tmp
+*.log
+/target
diff --git a/.npmignore b/.npmignore
deleted file mode 100644
index 366f223..0000000
--- a/.npmignore
+++ /dev/null
@@ -1,3 +0,0 @@
-/examples
-/src
-/test
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..7061c24
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1,2 @@
+ignore-engines=true
+registry=https://registry.npmjs.org
diff --git a/.travis.yml b/.travis.yml
index e3447bf..1053e0e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,15 @@
 language: node_js
 node_js:
-  - "0.8"
-  - "0.10"
-  - "0.11"
+  - 8
+  - 10
+  - 12
+deploy:
+  - provider: script
+    script: npx nlm release
+    skip_cleanup: true
+    'on':
+      branch: master
+      node: 12
 services: memcached
+before_install:
+  - npm i -g npm@^6
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5aad14..a632447 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,106 @@
+### 5.0.2
+
+* misc updates - **[@dbushong](https://github.com/dbushong)** [#46](https://github.com/groupon/node-cached/pull/46)
+  - [`25732ff`](https://github.com/groupon/node-cached/commit/25732ffaf461edddb9c03db28bb3c6b4f8d91342) **chore:** run updater
+  - [`eb5db4e`](https://github.com/groupon/node-cached/commit/eb5db4e64de5e6472de68c9e18cd9b3d05e066d3) **chore:** lint fixes
+  - [`e301ea9`](https://github.com/groupon/node-cached/commit/e301ea90eb56b2ce143fc394eea869538f3a3716) **chore:** npm audit fix
+
+
+### 5.0.1
+
+* chore: Remove yarn check that breaks people - **[@jkrems](https://github.com/jkrems)** [#42](https://github.com/groupon/node-cached/pull/42)
+  - [`147a7f3`](https://github.com/groupon/node-cached/commit/147a7f3e1a5dd1a3690e134facf077b3b3329edf) **chore:** Remove yarn check that breaks people
+
+
+### 5.0.0
+
+#### Breaking Changes
+
+drops support for Node 6, which is a current LTS release.
+
+*See: [`f4ba4c9`](https://github.com/groupon/node-cached/commit/f4ba4c988b5d5db0cf07edfe9f0013d5fada075f)*
+
+#### Commits
+
+* feat: drop node4 support - **[@aaarichter](https://github.com/aaarichter)** [#39](https://github.com/groupon/node-cached/pull/39)
+  - [`29b26fa`](https://github.com/groupon/node-cached/commit/29b26fa240033cd7b5409407ea42b375a29c4c33) **feat:** drop node4 support
+  - [`23dcc6a`](https://github.com/groupon/node-cached/commit/23dcc6aa409f82be5485f3041948a9cdd1c1755e) **chore:** feedback addressed
+* Drop Node 6 support, and Babel as a result - **[@markowsiak](https://github.com/markowsiak)** [#40](https://github.com/groupon/node-cached/pull/40)
+  - [`2339fd1`](https://github.com/groupon/node-cached/commit/2339fd1d2064e6bab3f21fce0ca68af3916be129) **chore:** npm audit, drop babel
+  - [`f4ba4c9`](https://github.com/groupon/node-cached/commit/f4ba4c988b5d5db0cf07edfe9f0013d5fada075f) **chore:** drop support for node 6, keep async/await in test
+  - [`fe943d8`](https://github.com/groupon/node-cached/commit/fe943d8b7b34c7d4439e674cacc675699e3ba98e) **chore:** use npm 6 in travis
+
+
+### 4.3.2
+
+* Apply latest nlm generator - **[@markowsiak](https://github.com/markowsiak)** [#38](https://github.com/groupon/node-cached/pull/38)
+  - [`35b216e`](https://github.com/groupon/node-cached/commit/35b216e3d11b94502d968d40fcf7f34e7a5b507e) **chore:** Apply latest nlm generator
+
+
+### 4.3.1
+
+* docs: Clarify that timeout applies to unset - **[@Zanadar](https://github.com/Zanadar)** [#36](https://github.com/groupon/node-cached/pull/36)
+  - [`89209ce`](https://github.com/groupon/node-cached/commit/89209cefca9ad39ea1b2a789dd49e23d65eee960) **docs:** Clarify that timeout applies to unset
+* docs: Fix typo in contributing.md - **[@Zanadar](https://github.com/Zanadar)** [#35](https://github.com/groupon/node-cached/pull/35)
+  - [`a3e5efa`](https://github.com/groupon/node-cached/commit/a3e5efaeec84e115de7fea035d5f69efc08cae3e) **docs:** fix typo in contributing.md
+
+
+### 4.3.0
+
+* feat: expose `cache.unset` - **[@fdegiuli](https://github.com/fdegiuli)** [#31](https://github.com/groupon/node-cached/pull/31)
+  - [`4e296af`](https://github.com/groupon/node-cached/commit/4e296afed9ce305ed27f94fb9d0e011a01d0bd87) **feat:** expose `cache.unset`
+
+
+### 4.2.3
+
+* docs: Update memory backend docs - **[@fdegiuli](https://github.com/fdegiuli)** [#29](https://github.com/groupon/node-cached/pull/29)
+  - [`3cebdb3`](https://github.com/groupon/node-cached/commit/3cebdb3cdb0dc997803d81d6c8c615e308261b0b) **docs:** Update memory backend docs
+  - [`dabce45`](https://github.com/groupon/node-cached/commit/dabce45603667e7112a87bf5592eaab73aac3b0e) **docs:** Fix formatting
+
+
+### 4.2.2
+
+* Update documentation for `cached` and backends - **[@fdegiuli](https://github.com/fdegiuli)** [#27](https://github.com/groupon/node-cached/pull/27)
+  - [`b137f56`](https://github.com/groupon/node-cached/commit/b137f56b77f1278ca6ab3680b6a0d1187941f788) **docs:** Add memory, noop backends to docs
+  - [`e4bd666`](https://github.com/groupon/node-cached/commit/e4bd6667d8f9fa2f4017876badee9e28e9d0bd49) **docs:** Deprecate unnamed caches
+
+
+### 4.2.1
+
+* Apply latest nlm generator - **[@i-tier-bot](https://github.com/i-tier-bot)** [#24](https://github.com/groupon/node-cached/pull/24)
+  - [`ee2b354`](https://github.com/groupon/node-cached/commit/ee2b354f83c2ee0fa4cc865e49bb4c6c4434c001) **chore:** Apply latest nlm generator
+
+
+### 4.2.0
+
+* True timeouts for cache calls - **[@jkrems](https://github.com/jkrems)** [#22](https://github.com/groupon/node-cached/pull/22)
+  - [`0d9e48f`](https://github.com/groupon/node-cached/commit/0d9e48fc07b82723a481499084a9bf14f3bc1b0d) **feat:** True timeouts for cache calls
+
+
+### 4.1.1
+
+* Switch to nlm - **[@jkrems](https://github.com/jkrems)** [#21](https://github.com/groupon/node-cached/pull/21)
+  - [`bdac8c6`](https://github.com/groupon/node-cached/commit/bdac8c6f1f68e6296abf513c941736c88771149a) **chore:** Switch to nlm
+
+
+4.0.2
+-----
+* Fix unhandled rejections w/ lazy fetching - @jkrems
+  https://github.com/groupon/node-cached/pull/16
+
+4.0.1
+-----
+* Fixing memcached.set slowness - @chkhoo #15
+
+4.0.0
+-----
+* Recompiled using cs 1.9.1 - @jkrems #11
+* Bringing this package into the future, io.js support - @jkrems #10
+
+v3.0.1
+------
+* exchange cs (for csr) and lodash (for underscore) - @Kofia5 #8
+
 v3.0.0
 ------
 Upgrading to this version changes the key hashing.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index bcf866b..1ef00de 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,30 +1,171 @@
-# Contribution Guide
+<!-- Generated by npm init @grpn -->
 
-Please follow this guide when
-creating issues or pull requests.
+# Contributing
 
-## Reporting a Bug
+🎉🏅 Thanks for helping us improve this project! 🙏
 
-Before reporting a bug,
-make sure you are using the latest versions of cached.
+This document outlines some of the practices we care about.
+If you have any questions or suggestions about the process,
+feel free to [open an issue](#reporting-issues)
+.
 
-When reporting a bug with cached,
-please provide a minimal test case.
-This can be a gist,
-inline in the description,
-or in the form of a pull request
-that includes a failing test.
+## How Can I Contribute?
 
-If you are contributing a bug fix,
-make sure it has a passing test
-in your pull request.
+### Reporting Issues
 
-## Adding a Feature
+If you find any mistakes in the docs or a bug in the code,
+please [open an issue in Github](https://github.com/groupon/node-cached/issues/new) so we can look into it.
+You can also [create a PR](#contributing-code) fixing it yourself, or course.
 
-Before implementing features,
-try to make sure that
-(1) no one else is currently working on that and
-(2) you have checked with the maintainers
-that this is something they would like to see.
+If you report a bug, please follow these guidelines:
+
+* Make sure the bug exists in the latest version.
+* Include instructions on how to reproduce the issue.
+  The instructions should be as minimal as possible
+  and answer the three big questions:
+  1. What are the exact steps you took? This includes the exact versions of
+      node, npm, and any packages involved.
+  1. What result are you expecting?
+  1. What is the actual result?
+
+### Improving Documentation
+
+For small documentation changes, you can use [Github's editing feature][ghedit].
+The only thing to keep in mind is to prefix the commit message with "docs: ".
+The default commit message generated by Github will lead to a failing CI build.
+
+[ghedit]: https://help.github.com/articles/editing-files-in-another-user-s-repository/
+
+For larger updates to the documentation
+it might be better to follow the
+[instructions for contributing code below](#contributing-code).
+
+### Contributing Code
+
+**Note:** If you're planning on making substantial changes,
+please [open an issue first to discuss your idea](#reporting-issues).
+Otherwise you might end up investing a lot of work
+only to discover that it conflicts with plans the maintainers might have.
+
+The general steps for creating a pull request are:
+
+1. Create a branch for your change.  Always start your branch from the latest
+    `master`.  We recommend using `git wf start some-feature-name` by using
+    [git workflow][gitwf].  Run `npm install` to install the dependencies.
+1. If you're fixing a bug, be sure to write a test *first*.  That way you can
+    validate that the test actually catches the bug and doesn't pass.
+1. Make your changes to the code.  Remember to update the tests if you add new
+    features or change behavior.
+1. Run the tests via `npm test`. This will also run style checks and other
+    validations.  You might see errors about uncommitted files.  This is
+    expected until you commit your changes.
+1. Once you're done, `git add .` and `git commit`.  Please follow the
+    [commit message conventions](#commits--commit-messages) described below.
+1. Push your branch to Github & create a PR.
+
+[gitwf]: https://github.com/groupon/git-workflow
+
+#### Code Style
+
+In addition to any linting rules the project might include, a few general rules
+of thumb:
+
+* Try to match the style of the rest of the code.
+* We prefer simple code that is easy to understand over terse, expressive code.
+* We try to structure projects by semantics instead of role.  E.g. we'd rather
+    have a `tree.js` module that contains tree traversal-related helpers than
+    a `helpers.js` module.
+* Actually, if you create helpers you might want to put those into a separate
+    package. That way it's easier to reuse them.
+
+#### Commits & Commit Messages
+
+Please follow the [angular commit message conventions][angular-commits].  We
+use an automated tool for generating releases that depends on the conventions
+to determine the next version and the content of the changelog.  Commit messages
+that don't follow the conventions will cause `npm test` (and thus CI) to fail.
+
+The short summary - a commit message should look like this:
+
+```
+<type>: <subject>
+
+<body>
+
+<references>
+
+<footer>
+```
+
+Everything but the first line is optional.  The empty lines between the
+different parts are required.
+
+* `<type>`: One of the following:
+  - **feat:** Introduces a new feature. This will cause the minor version to go
+      up.  If this commit adds a feature to this module's public API, it's a
+      `feat:`
+  - **fix:** A bug fix. Causes a patch version bump.  A new feature is not (by
+      itself) a fix.
+  - **docs:** Changes to the documentation. This will also cause an increase of
+      the patch version so that the changes show up in the npm registry.
+  - **style:** Syntax cleanup & lint rule fixes.  Note that often it's better to
+      just amend the previous commit if it introduced lint errors, and tools
+      like `prettier` should be taking care of most `style` issues.
+  - **refactor:** Changes to the code structure without fixing bugs or adding
+      features.  If the functionality is unchanged, but you're touching active
+      code in the package, it's a `refactor`.
+  - **perf:** Performance optimizations.
+  - **test:** Fixing existing tests or adding missing ones.
+      Just like with **style**, if you add tests to a feature you just
+      introduced in the previous commit, consider keeping the tests and the
+      feature in the same commit instead.
+  - **chore:** Changes to the project setup and tools, dependency bumps,
+      and package-building house-keeping.  `chore` is not a judgement on how you
+      feel about a given work.  Changes to actual code are **NEVER** `chore`
+      commits.  If you're fixing, refactoring, or adding a feature, that is
+      by definition a `fix`, `refactor`, or `feat`.  If you're upgrading some
+      dev dependency, fiddling with the package.json author field, etc., that's
+      a `chore` commit.
+* `<subject>`: A [good git commit message subject][limit50].
+  - Keep it brief. If possible the whole first line should have at most 50
+      characters.
+  - Use imperative mood. "Create" instead of "creates" or "created".
+  - No period (".") at the end.
+* `<body>`: Motivation for the change and any context required for understanding
+    the choices made.  Just like the subject, it should use imperative mood.
+* `<references>`: Any URLs relevant to the PR go here.  Use one line per URL and
+    prefix it with the kind of relationship, e.g. "Closes: " or "See: ".  If you
+    are referencing an issue in your commit body or PR description, never use
+    `#123` but the full URL to the issue or PR you are referencing.  That way
+    the reference is easy to resolve from the git history without having to
+    "guess" the correct link even if the commit got cherry-picked or merged
+    into a different project.
+* `<footer>`: This part only applies if your commit introduces a breaking
+    change.  It's important this is present, otherwise the major version will
+    not increase.  See below for an example.
+
+[angular-commits]: https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#commit-message-format
+[limit50]: http://chris.beams.io/posts/git-commit/#limit-50
+
+##### Examples
+
+A feature that introduces a breaking change:
+
+```
+feat: Support --yes CLI option
+
+For existing projects all prompts can be inferred automatically.
+Manual confirmation for each default provides no value in that case.
+
+Closes https://github.com/my/project/issues/123
+
+BREAKING CHANGE: This removes support for interactive password entry.
+Users will have to login beforehand.
+```
+
+A simple bug fix:
+
+```
+fix: Handle multi-byte characters in search logic
+```
 
-All features should have tests.
diff --git a/Makefile b/Makefile
deleted file mode 100644
index 76a3bc6..0000000
--- a/Makefile
+++ /dev/null
@@ -1,36 +0,0 @@
-
-SRC = $(shell find src -name "*.coffee" -type f | sort)
-LIB = $(SRC:src/%.coffee=lib/%.js)
-
-COFFEE=node_modules/.bin/coffee --js
-MOCHA=node_modules/.bin/mocha --recursive --compilers coffee:coffee-script-redux/register -u tdd --timeout 6000
-
-all: clean setup test check-checkout-clean
-
-build: $(LIB)
-	@./node_modules/.bin/npub prep lib
-
-prepublish:
-	./node_modules/.bin/npub prep
-
-lib/%.js: src/%.coffee
-	dirname "$@" | xargs mkdir -p
-	$(COFFEE) <"$<" >"$@"
-
-clean:
-	rm -rf lib
-	rm -rf node_modules
-
-test: build
-	$(MOCHA) -R spec test/*.coffee
-
-release: all
-	git push --tags origin HEAD:master
-	npm publish
-
-setup:
-	npm install
-
-# This will fail if there are unstaged changes in the checkout
-check-checkout-clean:
-	git diff --exit-code
diff --git a/README.md b/README.md
index 9c46ab9..73bccd3 100644
--- a/README.md
+++ b/README.md
@@ -88,14 +88,44 @@ cached('myStuff', { backend: {
 }});
 ```
 
+### Memory
+
+Stores all the data in an in-memory object. 
+*__Caveat:__ `get()` will return a reference to the stored value. Mutating the returned value will affect the value in the cache.*
+
+#### Example
+
+```js
+cached('myStuff', { backend: {
+  type: 'memory'
+}});
+```
+
+### Noop
+
+Doesn't store data at all. All `set` operations succeed and `get` operations behave as if the value were not found in the cache.
+
+#### Examples
+
+```js
+cached('myStuff', { backend: {
+  type: 'noop'
+}});
+```
+
+```js
+cached('myStuff');
+```
+
+
 ## API
 
 ### cached(name: string, options) -> Cache
 
 Creates a new named cache or returns a previously initialized cache.
 
-* **name:** A meaningful name for what is in the cache, default: `"default"`. This will also be used as a key-prefix. If the name is `"cars"`, all keys will be prefixed with `"cars:"`
-* **options:**
+* **name:** (required) A meaningful name for what is in the cache. This will also be used as a key-prefix. If the name is `"cars"`, all keys will be prefixed with `"cars:"`
+* **options:** (optional)
   * **backend:** An object that has at least a `type` property. If no backend is configured, the cache will run in "noop"-mode, not caching anything. All other properties are forwarded to the backend, see [using different backends](#supported-backends) for which backend types exist and what options they support.
   * **defaults:** Defaults to apply for all cache operations. See `Cache.setDefaults`
 
@@ -138,6 +168,11 @@ The two important ones are `freshFor` and `expire`:
 
 * `expire` is the time in seconds after which a value should be deleted from the cache (or whatever expiring natively means for the backend). Usually you'd want this to be `0` (never expire).
 * `freshFor` is the time in seconds after which a value should be replaced. Replacing the value is done in the background and while the new value is generated (e.g. data is fetched from some service) the stale value is returned. Think of `freshFor` as a smarter `expire`.
+* `timeout` is the maximum time in milliseconds to wait for cache operations to complete.
+  Configuring a timeout ensures that all `get`, `set`, and `unset` operations fail fast.
+  Otherwise there will be situations where one of the cache hosts goes down and reads hang for minutes while the memcached client retries to establish a connection.
+  It's **highly** recommended to set a timeout.
+  If `timeout` is left `undefined`, no timeout will be set and the operations will only fail once the underlying client, e.g. [`memcached`](https://github.com/3rd-Eden/memcached), gave up.
 
 ### Cache.set(key, value, opts, cb) -> Promise[Value]
 
@@ -167,3 +202,8 @@ When multiple `getOrElse` calls concurrently encounter the same stale value, it
 This is done on a per-instance level, so if you create many cache instances reading and writing the same keys, you are asking for trouble.
 If you don't, the worst case is every process in your system fetching the value at once.
 Which should be a smaller number than the number of concurrent requests in most cases.
+
+### Cache.unset(key, cb) -> Promise
+
+Cache delete operation.
+`key` has to be a string.
diff --git a/examples/cached-usage.coffee b/examples/cached-usage.coffee
deleted file mode 100644
index 59484af..0000000
--- a/examples/cached-usage.coffee
+++ /dev/null
@@ -1,40 +0,0 @@
-# 1. Create a named cache
-#    Once created, you can retrieve the same cache-instance later by
-#    just calling `cached "divisions"` without any additional arguments.
-cached = require ".."
-divisionsCache = cached "divisions", backend: "memcached"
-
-# 2. Dump stuff in the cache
-divisionsCache.set "chicago", { name: "Chicago" }, ->
-  console.log "Stored in cache."
-
-  # 3. Get stuff from the cache
-  divisionsCache.get "chicago", (err, data) ->
-    console.log "Got data:", data
-
-    # 4. Make it smarter: getOrElse
-    # This function allows you to (almost) always keep the cache populated
-    # and refetch the data in the background. It uses two settings:
-    #
-    # * freshFor: Age in seconds after which data in the cache will be replaced
-    # * expire: Age in seconds when data will be invalidated
-    #
-    # As long as you don't let data expire, you will always get the values
-    # directly from the cache and it will be updated asynchronously from getting.
-    callCounter = 0
-    fetchSF = cached.deferred (cb) ->
-      ++callCounter
-      setTimeout (->
-        # Some fetch operation
-        cb null, { name: "San Francisco" }
-      ), 1000
-
-    opts = { freshFor: 2, expire: 60 }
-    divisionsCache.getOrElse "san-francisco", fetchSF, opts, (err, data) ->
-      console.log "Got data:", data
-
-    divisionsCache.getOrElse "san-francisco", fetchSF, opts, (err, data) ->
-      console.log "Got data:", data
-
-      # It's smart enough to only fetch once.
-      console.log "Called the fetch function #{callCounter} times."
diff --git a/examples/memcached.coffee b/examples/memcached.coffee
deleted file mode 100644
index 5028800..0000000
--- a/examples/memcached.coffee
+++ /dev/null
@@ -1,35 +0,0 @@
-
-cached = require '..'
-
-cache = cached 'my-cache', backend: 'memcached'
-
-values =
-  key1: 'Value 1'
-  key2: 'Value 2'
-  key3: 'Value 3'
-
-cache.set 'key1', values.key1, ->
-  console.log 'key1: Set callback style'
-
-cache.set('key2', values.key2, { expire: 1 })
-.then ->
-  console.log 'key2: Set promise style, expires after 1 second'
-
-cache.set('key3', values.key3, freshFor: 2)
-.then ->
-  console.log 'key3: Fresh for 2 seconds'
-
-[ 100, 3000 ].map (timeout) ->
-  tryGetFromCache = ->
-    console.log "Trying to get values after #{timeout} msecs"
-    [ 'key1', 'key2', 'key3' ].map (key) ->
-      cache.get key, (err, data) ->
-        console.log "get (callback):\t#{key}: #{data}"
-
-      cache.get(key).then (data) ->
-        console.log "get (promise):\t#{key}: #{data}"
-
-      cache.getOrElse(key, "New value for #{key}").then (data) ->
-        console.log "getOrElse:\t#{key}: #{data}"
-
-  setTimeout(tryGetFromCache, timeout)
diff --git a/examples/memory.coffee b/examples/memory.coffee
deleted file mode 100644
index 70d52ce..0000000
--- a/examples/memory.coffee
+++ /dev/null
@@ -1,35 +0,0 @@
-
-cached = require '..'
-
-cache = cached 'my-cache', backend: 'memory'
-
-values =
-  key1: 'Value 1'
-  key2: 'Value 2'
-  key3: 'Value 3'
-
-cache.set 'key1', values.key1, ->
-  console.log 'key1: Set callback style'
-
-cache.set('key2', values.key2, { expire: 1 })
-.then ->
-  console.log 'key2: Set promise style, expires after 1 second'
-
-cache.set('key3', values.key3, freshFor: 2)
-.then ->
-  console.log 'key3: Fresh for 2 seconds'
-
-[ 100, 3000 ].map (timeout) ->
-  tryGetFromCache = ->
-    console.log "Trying to get values after #{timeout} msecs"
-    [ 'key1', 'key2', 'key3' ].map (key) ->
-      cache.get key, (err, data) ->
-        console.log "get (callback):\t#{key}: #{data}"
-
-      cache.get(key).then (data) ->
-        console.log "get (promise):\t#{key}: #{data}"
-
-      cache.getOrElse(key, "New value for #{key}").then (data) ->
-        console.log "getOrElse:\t#{key}: #{data}"
-
-  setTimeout(tryGetFromCache, timeout)
diff --git a/lib/backend.js b/lib/backend.js
index e8ff473..ef6b81d 100644
--- a/lib/backend.js
+++ b/lib/backend.js
@@ -1,58 +1,66 @@
 /*
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-// Generated by CoffeeScript 2.0.0-beta7
-void function () {
-  var backend, typeMap;
-  backend = module.exports = {};
-  typeMap = {};
-  backend.addType = function (type, klass) {
-    return typeMap[type] = klass;
-  };
-  backend.create = function (options) {
-    var klass, type;
-    if (null != options)
-      options;
-    else
-      options = {};
-    if ('function' === typeof options.get && 'function' === typeof options.set)
-      return options;
-    type = null != options.type ? options.type : 'noop';
-    klass = typeMap[type];
-    if (!(null != klass))
-      throw new Error('' + type + ' is not a supported cache backend type');
-    return new klass(options);
-  };
-  backend.addType('noop', require('./backends/noop'));
-  backend.addType('memory', require('./backends/memory'));
-  backend.addType('memcached', require('./backends/memcached'));
-}.call(this);
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+'use strict';
+
+const typeMap = new Map();
+
+function isBackend(object) {
+  return typeof object.get === 'function' && typeof object.set === 'function';
+}
+
+exports.create = function create(options) {
+  options = options || {};
+
+  if (isBackend(options)) {
+    return options;
+  }
+
+  const type = options.type || 'noop';
+  const BackendClass = typeMap.get(type);
+  if (!BackendClass) {
+    throw new Error(`${type} is not a supported cache backend type`);
+  }
+  return new BackendClass(options);
+};
+
+function addType(type, BackendClass) {
+  typeMap.set(type, BackendClass);
+  return BackendClass;
+}
+exports.addType = addType;
+
+addType('noop', require('./backends/noop'));
+
+addType('memory', require('./backends/memory'));
+
+addType('memcached', require('./backends/memcached'));
diff --git a/lib/backends/memcached.js b/lib/backends/memcached.js
index e642b74..c30ed83 100644
--- a/lib/backends/memcached.js
+++ b/lib/backends/memcached.js
@@ -1,82 +1,77 @@
 /*
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
+'use strict';
 
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
+const promisify = require('bluebird').promisify;
+const Memcached = require('memcached');
 
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
+const noop = () => undefined;
 
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
+function createClient(options) {
+  if (options.client) {
+    return options.client;
+  }
+  const hosts = options.hosts || '127.0.0.1:11211';
+  return new Memcached(hosts, options);
+}
 
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
+function normalizeValue(value) {
+  return value === false ? null : value;
+}
 
-// Generated by CoffeeScript 2.0.0-beta7
-void function () {
-  var Memcached, MemcachedBackend;
-  Memcached = require('memcached');
-  MemcachedBackend = function () {
-    var description;
-    description = 'Uses anything supporting the memcache protocol';
-    function MemcachedBackend(options) {
-      var hosts;
-      this.type = 'memcached';
-      if (null != options.client) {
-        this.client = options.client;
-      } else {
-        hosts = null != options.hosts ? options.hosts : '127.0.0.1:11211';
-        this.client = new Memcached(hosts, options);
-      }
-    }
-    MemcachedBackend.prototype.get = function (key, callback) {
-      return this.client.get(key, function (err, answer) {
-        if (answer === false)
-          answer = null;
-        if (null != err) {
-          return callback(err);
-        } else {
-          return callback(null, answer);
-        }
-      });
-    };
-    MemcachedBackend.prototype.set = function (key, value, options, callback) {
-      return this.client.set(key, value, options.expire, function (err, ok) {
-        if (null != err) {
-          return callback(err);
-        } else {
-          return callback(null, value);
-        }
-      });
-    };
-    MemcachedBackend.prototype.unset = function (key, callback) {
-      delete this.cache[key];
-      if (null != callback)
-        callback(null);
-      return null;
-    };
-    MemcachedBackend.prototype.end = function () {
-      return this.client.end();
-    };
-    return MemcachedBackend;
-  }();
-  module.exports = MemcachedBackend;
-}.call(this);
+/* Uses anything supporting the memcache protocol */
+function MemcachedBackend(options) {
+  this.type = 'memcached';
+  const client = (this.client = createClient(options));
+  this._clientGet = promisify(client.get, { context: client });
+  this._clientSet = promisify(client.set, { context: client });
+  this._clientDel = promisify(client.del, { context: client });
+}
+module.exports = MemcachedBackend;
+
+MemcachedBackend.prototype.get = function get(key) {
+  return this._clientGet(key).then(normalizeValue);
+};
+
+MemcachedBackend.prototype.set = function set(key, value, options) {
+  const constant = () => value;
+  return this._clientSet(key, value, options.expire).then(constant);
+};
+
+MemcachedBackend.prototype.unset = function unset(key) {
+  return this._clientDel(key).then(noop);
+};
+
+MemcachedBackend.prototype.end = function end() {
+  return this.client.end();
+};
diff --git a/lib/backends/memory.js b/lib/backends/memory.js
index f7f06bc..2c2c5bf 100644
--- a/lib/backends/memory.js
+++ b/lib/backends/memory.js
@@ -1,82 +1,66 @@
 /*
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
+'use strict';
 
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
+const Bluebird = require('bluebird');
 
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
+const util = require('../util');
 
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
+/* Stores everything just in memory */
+function MemoryBackend() {
+  this.cache = new Map();
+  this.type = 'memory';
+}
+module.exports = MemoryBackend;
 
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
+MemoryBackend.prototype.get = function get(key) {
+  let wrappedValue = this.cache.get(key) || null;
+  if (util.isExpired(wrappedValue && wrappedValue.e)) {
+    wrappedValue = null;
+    this.cache.delete(key);
+  }
+  return Bluebird.resolve(wrappedValue ? wrappedValue.d : null);
+};
 
-// Generated by CoffeeScript 2.0.0-beta7
-void function () {
-  var MemoryBackend;
-  MemoryBackend = function () {
-    var description;
-    description = 'Stores everything just in memory';
-    function MemoryBackend() {
-      this.cache = {};
-      this.type = 'memory';
-    }
-    MemoryBackend.prototype.get = function (key, callback) {
-      if (this.isExpired(null != this.cache[key] ? this.cache[key].e : void 0))
-        delete this.cache[key];
-      if (null != callback)
-        callback(null, null != (null != this.cache[key] ? this.cache[key].d : void 0) ? null != this.cache[key] ? this.cache[key].d : void 0 : null);
-      return null;
-    };
-    MemoryBackend.prototype.expiresAt = function (seconds) {
-      if (seconds === 0) {
-        return 0;
-      } else {
-        return new Date().getTime() + parseInt(seconds) * 1e3;
-      }
-    };
-    MemoryBackend.prototype.isExpired = function (expires) {
-      if (!(null != expires))
-        return false;
-      if (expires === 0)
-        return false;
-      return new Date().getTime() > new Date(expires).getTime();
-    };
-    MemoryBackend.prototype.set = function (key, value, options, callback) {
-      this.cache[key] = {
-        d: value,
-        e: this.expiresAt(options.expire)
-      };
-      if (null != callback)
-        callback(null, value);
-      return null;
-    };
-    MemoryBackend.prototype.unset = function (key, callback) {
-      delete this.cache[key];
-      if (null != callback)
-        callback(null);
-      return null;
-    };
-    return MemoryBackend;
-  }();
-  module.exports = MemoryBackend;
-}.call(this);
+MemoryBackend.prototype.set = function set(key, value, options) {
+  this.cache.set(key, {
+    d: value,
+    e: util.expiresAt(options.expire),
+  });
+  return Bluebird.resolve(value);
+};
+
+MemoryBackend.prototype.unset = function unset(key) {
+  this.cache.delete(key);
+  return Bluebird.resolve();
+};
diff --git a/lib/backends/noop.js b/lib/backends/noop.js
index c0cbde1..dbcf862 100644
--- a/lib/backends/noop.js
+++ b/lib/backends/noop.js
@@ -1,54 +1,53 @@
 /*
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
+'use strict';
 
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
+const Bluebird = require('bluebird');
 
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
+/* Simple backend doing nothing */
+function NoopBackend() {
+  this.type = 'noop';
+}
+module.exports = NoopBackend;
 
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
+NoopBackend.prototype.get = function get(/* key */) {
+  return Bluebird.resolve(null);
+};
 
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
+NoopBackend.prototype.set = function set(key, value) {
+  return Bluebird.resolve(value);
+};
 
-// Generated by CoffeeScript 2.0.0-beta7
-void function () {
-  var NoopBackend;
-  NoopBackend = function () {
-    var description;
-    description = 'Simple backend doing nothing';
-    function NoopBackend() {
-      this.type = 'noop';
-    }
-    NoopBackend.prototype.get = function (key, callback) {
-      return callback(null, null);
-    };
-    NoopBackend.prototype.set = function (key, value, options, callback) {
-      return callback(null, value);
-    };
-    NoopBackend.prototype.unset = function (key, callback) {
-      return callback(null);
-    };
-    return NoopBackend;
-  }();
-  module.exports = NoopBackend;
-}.call(this);
+NoopBackend.prototype.unset = function unset(/* key */) {
+  return Bluebird.resolve();
+};
diff --git a/lib/cache.js b/lib/cache.js
index 657d7d3..ac96e3a 100644
--- a/lib/cache.js
+++ b/lib/cache.js
@@ -1,182 +1,152 @@
 /*
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-// Generated by CoffeeScript 2.0.0-beta7
-void function () {
-  var Backend, Cache, expiresAt, extend, isExpired, optionalOpts, Q, toPromise;
-  extend = require('underscore').extend;
-  Q = require('q');
-  Backend = require('./backend');
-  toPromise = function (val) {
-    if ('function' === typeof val) {
-      return Q(val());
-    } else {
-      return Q(val);
-    }
-  };
-  expiresAt = function (seconds) {
-    if (seconds === 0) {
-      return 0;
-    } else {
-      return Date.now() + parseInt(seconds, 10) * 1e3;
-    }
-  };
-  isExpired = function (expires) {
-    if (expires === 0)
-      return false;
-    return Date.now() > new Date(expires).getTime();
-  };
-  optionalOpts = function (opts, cb) {
-    if (!(null != cb) && 'function' === typeof opts) {
-      return {
-        cb: opts,
-        opts: null
-      };
-    } else {
-      return {
-        cb: cb,
-        opts: opts
-      };
-    }
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const Backend = require('./backend');
+const getOrElse = require('./get-or-else');
+const util = require('./util');
+
+function Cache(options) {
+  this.defaults = {
+    freshFor: 0,
+    expire: 0,
   };
-  Cache = function () {
-    function Cache(param$) {
-      var backend, cache$, defaults, name;
+  this.name = options.name || 'default';
+  this.prefix = `${this.name}:`;
+  this.staleOrPending = {};
+
+  this.setDefaults(options.defaults);
+  this.setBackend(options.backend);
+}
+
+Cache.prototype.applyPrefix = function applyPrefix(key) {
+  return [this.prefix, key].join('');
+};
+
+Cache.prototype.setDefaults = function setDefaults(defaults) {
+  this.defaults = this.prepareOptions(defaults);
+  return this.defaults;
+};
+
+Cache.prototype.setBackend = function setBackend(backendOptions) {
+  backendOptions =
+    typeof backendOptions === 'string'
+      ? {
+          type: backendOptions,
+        }
+      : backendOptions || {};
+  this.end();
+  this.backend = Backend.create(backendOptions);
+  return this.backend;
+};
+
+Cache.prototype.end = function end() {
+  if (this.backend && this.backend.end) {
+    return this.backend.end();
+  }
+  return null;
+};
+
+Cache.prototype.prepareOptions = function prepareOptions(options) {
+  return Object.assign({}, this.defaults, options);
+};
+
+Cache.prototype._set = function _set(key, val, options) {
+  const self = this;
+  function writeToBackend(resolvedValue) {
+    return self.backend.set(
+      key,
       {
-        cache$ = param$;
-        backend = cache$.backend;
-        defaults = cache$.defaults;
-        name = cache$.name;
-      }
-      this.defaults = {
-        freshFor: 0,
-        expire: 0
-      };
-      this.name = name || 'default';
-      this.prefix = '' + this.name + ':';
-      this.staleOrPending = {};
-      this.setDefaults(defaults);
-      this.setBackend(backend);
-    }
-    Cache.prototype.applyPrefix = function (key) {
-      return '' + this.prefix + key;
-    };
-    Cache.prototype.setDefaults = function (defaults) {
-      return this.defaults = this.prepareOptions(defaults);
-    };
-    Cache.prototype.setBackend = function (backendOptions) {
-      backendOptions = 'string' === typeof backendOptions ? { type: backendOptions } : null != backendOptions ? backendOptions : {};
-      this.end();
-      return this.backend = Backend.create(backendOptions);
-    };
-    Cache.prototype.end = function () {
-      if (null != (null != this.backend ? this.backend.end : void 0))
-        return this.backend.end();
-    };
-    Cache.prototype.prepareOptions = function (options) {
-      return extend({}, this.defaults, options);
-    };
-    Cache.prototype.set = function (key, val, opts, cb) {
-      var backend, cache$;
-      cache$ = optionalOpts(opts, cb);
-      cb = cache$.cb;
-      opts = cache$.opts;
-      key = this.applyPrefix(key);
-      backend = this.backend;
-      opts = this.prepareOptions(opts);
-      return toPromise(val).then(function (resolvedValue) {
-        var wrappedValue;
-        wrappedValue = {
-          b: expiresAt(opts.freshFor),
-          d: resolvedValue
-        };
-        return Q.npost(backend, 'set', [
-          key,
-          wrappedValue,
-          opts
-        ]);
-      }).nodeify(cb);
-    };
-    Cache.prototype.getWrapped = function (key) {
-      return Q.npost(this.backend, 'get', [key]);
-    };
-    Cache.prototype.get = function (rawKey, cb) {
-      var key;
-      key = this.applyPrefix(rawKey);
-      return this.getWrapped(key).then(function (wrappedValue) {
-        return null != (null != wrappedValue ? wrappedValue.d : void 0) ? null != wrappedValue ? wrappedValue.d : void 0 : null;
-      }).nodeify(cb);
-    };
-    Cache.prototype.getOrElse = function (rawKey, val, opts, cb) {
-      var cache$, handleError, key, refreshValue, verifyFreshness;
-      key = this.applyPrefix(rawKey);
-      cache$ = optionalOpts(opts, cb);
-      cb = cache$.cb;
-      opts = cache$.opts;
-      opts = this.prepareOptions(opts);
-      refreshValue = function (this$) {
-        return function () {
-          var generatedValue;
-          generatedValue = toPromise(val);
-          return this$.set(rawKey, generatedValue, opts).then(function (this$1) {
-            return function (rawValue) {
-              delete this$1.staleOrPending[key];
-              return null != (null != rawValue ? rawValue.d : void 0) ? null != rawValue ? rawValue.d : void 0 : null;
-            };
-          }(this$), function (this$1) {
-            return function (err) {
-              delete this$1.staleOrPending[key];
-              return null != generatedValue ? generatedValue : null;
-            };
-          }(this$));
-        };
-      }(this);
-      verifyFreshness = function (this$) {
-        return function (wrappedValue) {
-          var expired, hit, loadingNewValue;
-          hit = null != wrappedValue;
-          expired = isExpired(null != wrappedValue ? wrappedValue.b : void 0);
-          loadingNewValue = null != this$.staleOrPending[key];
-          if ((!hit || expired) && !loadingNewValue)
-            this$.staleOrPending[key] = refreshValue();
-          return null != (null != wrappedValue ? wrappedValue.d : void 0) ? null != wrappedValue ? wrappedValue.d : void 0 : this$.staleOrPending[key];
-        };
-      }(this);
-      handleError = function (error) {
-        return null;
-      };
-      return this.getWrapped(key)['catch'](handleError).then(verifyFreshness).nodeify(cb);
-    };
-    return Cache;
-  }();
-  module.exports = Cache;
-}.call(this);
+        b: util.expiresAt(options.freshFor),
+        d: resolvedValue,
+      },
+      options
+    );
+  }
+
+  return this._applyTimeout(util.toPromise(val).then(writeToBackend));
+};
+
+Cache.prototype.set = function set(rawKey, val, _opts, _cb) {
+  const args = util.optionalOpts(_opts, _cb);
+  const key = this.applyPrefix(rawKey);
+  const optsWithDefaults = this.prepareOptions(args.opts);
+
+  return this._set(key, val, optsWithDefaults).nodeify(args.cb);
+};
+
+Cache.prototype._applyTimeout = function _applyTimeout(value) {
+  const timeoutMs = this.defaults.timeout;
+  if (timeoutMs > 0) {
+    return value.timeout(timeoutMs);
+  }
+  return value;
+};
+
+Cache.prototype._getWrapped = function _getWrapped(key) {
+  return this._applyTimeout(this.backend.get(key));
+};
+
+// For backwards compatibility, eventually we should deprecate this.
+// It *should* be a private API.
+Cache.prototype.getWrapped = Cache.prototype._getWrapped;
+
+Cache.prototype.get = function get(rawKey, cb) {
+  const key = this.applyPrefix(rawKey);
+
+  return this._getWrapped(key)
+    .then(util.extractValue)
+    .nodeify(cb);
+};
+
+Cache.prototype.getOrElse = function _getOrElse(rawKey, val, _opts, _cb) {
+  const key = this.applyPrefix(rawKey);
+  const args = util.optionalOpts(_opts, _cb);
+  const optsWithDefaults = this.prepareOptions(args.opts);
+
+  return getOrElse(this, key, val, optsWithDefaults).nodeify(args.cb);
+};
+
+Cache.prototype.unset = function unset(rawKey, cb) {
+  const key = this.applyPrefix(rawKey);
+
+  return this._unset(key).nodeify(cb);
+};
+
+Cache.prototype._unset = function _unset(key) {
+  return this._applyTimeout(this.backend.unset(key));
+};
+
+module.exports = Cache;
diff --git a/lib/cached.js b/lib/cached.js
index 9db958e..957db05 100644
--- a/lib/cached.js
+++ b/lib/cached.js
@@ -1,75 +1,89 @@
 /*
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
+'use strict';
 
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
+const Bluebird = require('bluebird');
+const util = require('util');
 
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
+const Cache = require('./cache');
 
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
+const namedCaches = new Map();
 
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
+const getName = util.deprecate(
+  name => name || 'default',
+  'Unnamed caches and caches with non-string names are deprecated.'
+);
 
-// Generated by CoffeeScript 2.0.0-beta7
-void function () {
-  var Cache, cached, extend, namedCaches, Q;
-  try {
-    Q = require('../node_modules/q');
-    Q.stopUnhandledRejectionTracking();
-  } catch (e$) {
-    Q = require('q');
+function cached(name, options) {
+  if (typeof name !== 'string') {
+    name = getName(name);
   }
-  Cache = require('./cache');
-  extend = require('underscore').extend;
-  namedCaches = {};
-  cached = function (name, options) {
-    if (null == name)
-      name = 'default';
-    if (null == options)
-      options = {};
-    options = extend({ name: name }, options);
-    return null != namedCaches[name] ? namedCaches[name] : namedCaches[name] = cached.createCache(options);
-  };
-  cached.createCache = function (options) {
-    if (null == options)
-      options = {};
-    return new Cache(options);
-  };
-  cached.dropNamedCaches = function () {
-    namedCaches = {};
-    return cached;
-  };
-  cached.dropNamedCache = function (name) {
-    delete namedCaches[name];
-    return cached;
-  };
-  cached.knownCaches = function () {
-    return Object.keys(namedCaches);
-  };
-  cached.deferred = function (fn) {
-    return function () {
-      return Q.nfcall(fn);
-    };
-  };
-  module.exports = cached;
-}.call(this);
+
+  if (!namedCaches.has(name)) {
+    namedCaches.set(
+      name,
+      cached.createCache(
+        Object.assign(
+          {
+            name,
+          },
+          options || {}
+        )
+      )
+    );
+  }
+  return namedCaches.get(name);
+}
+module.exports = cached;
+
+cached.createCache = function createCache(options) {
+  return new Cache(options || {});
+};
+
+cached.dropNamedCaches = function dropNamedCaches() {
+  namedCaches.clear();
+  return cached;
+};
+
+cached.dropNamedCache = function dropNamedCache(name) {
+  namedCaches.delete(name);
+  return cached;
+};
+
+cached.knownCaches = function knownCaches() {
+  return [...namedCaches.keys()];
+};
+
+cached.deferred = function deferred(fn) {
+  return Bluebird.promisify(fn);
+};
diff --git a/lib/get-or-else.js b/lib/get-or-else.js
new file mode 100644
index 0000000..724592b
--- /dev/null
+++ b/lib/get-or-else.js
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* eslint-disable no-underscore-dangle */
+
+'use strict';
+
+const Bluebird = require('bluebird');
+
+const util = require('./util');
+
+function getOrElse(cache, key, val, opts) {
+  function resetStaleOrPending(passThroughData) {
+    delete cache.staleOrPending[key];
+    return passThroughData;
+  }
+
+  function writeValue(generatedValue) {
+    function fallbackToLoadedValue() {
+      return generatedValue === undefined ? null : generatedValue;
+    }
+
+    return cache
+      ._set(key, generatedValue, opts)
+      .then(util.extractValue)
+      .catch(fallbackToLoadedValue);
+  }
+
+  function refreshValue() {
+    let refreshed;
+
+    function handleWriteError(err) {
+      resetStaleOrPending();
+      if (refreshed.wasEverReturned) {
+        return Bluebird.reject(err);
+      }
+      return null;
+    }
+
+    refreshed = util
+      .toPromise(val)
+      .then(writeValue)
+      .then(resetStaleOrPending, handleWriteError);
+
+    return refreshed;
+  }
+
+  function verifyFreshness(wrappedValue) {
+    const hit = !!wrappedValue;
+    let loadingNewValue = cache.staleOrPending[key] !== undefined;
+
+    if (
+      !loadingNewValue &&
+      (!hit || util.isExpired(wrappedValue && wrappedValue.b))
+    ) {
+      cache.staleOrPending[key] = refreshValue();
+      loadingNewValue = true;
+    }
+
+    const dataFromCache = util.extractValue(wrappedValue);
+    if (dataFromCache === null && loadingNewValue) {
+      cache.staleOrPending[key].wasEverReturned = true;
+      return cache.staleOrPending[key];
+    }
+
+    return dataFromCache;
+  }
+
+  return cache
+    ._getWrapped(key)
+    .catch(() => null)
+    .then(verifyFreshness);
+}
+module.exports = getOrElse;
diff --git a/lib/util.js b/lib/util.js
new file mode 100644
index 0000000..dc6798b
--- /dev/null
+++ b/lib/util.js
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2014, Groupon, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of GROUPON nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+'use strict';
+
+const Bluebird = require('bluebird');
+
+exports.expiresAt = function expiresAt(seconds) {
+  if (seconds === 0) {
+    return 0;
+  }
+  return Date.now() + parseInt(seconds, 10) * 1000;
+};
+
+exports.isExpired = function isExpired(expires) {
+  if (!expires) {
+    return false;
+  }
+  return Date.now() > new Date(expires).getTime();
+};
+
+exports.extractValue = function extractValue(wrappedValue) {
+  const value = wrappedValue && wrappedValue.d;
+  // Normalize `undefined` into `null`
+  return value === undefined ? null : value;
+};
+
+exports.toPromise = function toPromise(val) {
+  if (typeof val === 'function') {
+    return Bluebird.resolve(val());
+  }
+  return Bluebird.resolve(val);
+};
+
+exports.optionalOpts = function optionalOpts(opts, cb) {
+  if (!cb && typeof opts === 'function') {
+    return { cb: opts, opts: null };
+  }
+  return { cb, opts };
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..07b78e2
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2789 @@
+{
+  "name": "cached",
+  "version": "5.0.2",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "JSONStream": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
+      "integrity": "sha512-E+iruNOY8VV9s4JEbe1aNEm6MiszPRr/UfcHMz0TQh1BXSxHK+ASV1R6W4HpjBhSeS+54PIsAMCBmwD06LLsqQ==",
+      "dev": true,
+      "requires": {
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
+      }
+    },
+    "acorn": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
+      "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
+      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
+    "ansi-colors": {
+      "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
+      "integrity": "sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw==",
+      "dev": true
+    },
+    "ansi-escapes": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.0.tgz",
+      "integrity": "sha512-EiYhwo0v255HUL6eDyuLrXEkTi7WwVCLAw+SeOQ7M7qdun1z1pum4DEm/nuqIVbPvi9RPPc9k9LbyBv6H0DwVg==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.8.1"
+      }
+    },
+    "ansi-regex": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
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+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "dev": true
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
+    "yargs": {
+      "version": "13.3.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
+      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.1"
+      },
+      "dependencies": {
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.1.tgz",
+          "integrity": "sha512-85Tk+90UCVWvbDavCLKPOLC9vvY8OwEX/RtKF+/1OADJMVlFfEHOiMTPVyxg7mk/dKa+ipdHm0OUkTvCpMTuwg==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.15",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+          "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
+          "dev": true
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 3eae46c..3e06fe5 100644
--- a/package.json
+++ b/package.json
@@ -1,42 +1,69 @@
 {
   "name": "cached",
-  "version": "3.0.0",
+  "version": "5.0.2",
   "description": "Simple access to a cache",
+  "license": "BSD-3-Clause",
   "main": "lib/cached.js",
-  "keywords": [
-    "memcached",
-    "stampede",
-    "cache"
-  ],
-  "scripts": {
-    "test": "make test"
-  },
+  "homepage": "https://github.com/groupon/node-cached",
   "repository": {
     "type": "git",
-    "url": "git://github.com/groupon/node-cached.git"
+    "url": "https://github.com/groupon/node-cached"
   },
-  "author": {
-    "name": "Jan Krems",
-    "email": "jan.krems@groupon.com>"
+  "bugs": {
+    "url": "https://github.com/groupon/node-cached/issues"
   },
-  "publishConfig": {
-    "registry": "https://registry.npmjs.org",
+  "scripts": {
+    "lint": "npm-run-all lint:*",
+    "lint:js": "eslint .",
+    "pretest": "npm-run-all pretest:*",
+    "test": "npm-run-all test:*",
+    "posttest": "npm-run-all posttest:*",
+    "pretest:lint": "npm-run-all lint:*",
+    "posttest:nlm": "nlm verify",
+    "test:unit": "mocha"
+  },
+  "engines": {
+    "node": ">=8.3.0",
+    "npm": "^6.0.0"
+  },
+  "nlm": {
     "license": {
-      "exclude": [
-        "test"
+      "files": [
+        "lib"
       ]
     }
   },
   "dependencies": {
-    "underscore": "~1.4.4",
-    "q": "~0.9.7",
-    "memcached": "2.0.0"
+    "bluebird": "^3.3.3",
+    "memcached": "^2.2.2"
   },
   "devDependencies": {
-    "bondjs": "~1.0.0",
-    "coffee-script-redux": "2.0.0-beta7",
-    "expect.js": "0.2.0",
-    "mocha": "1.7.4",
-    "npub": "0.0.5"
+    "assertive": "^2.1.0",
+    "eslint": "^6.6.0",
+    "eslint-config-groupon": "^8.0.0",
+    "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-mocha": "^6.1.0",
+    "eslint-plugin-node": "^10.0.0",
+    "eslint-plugin-prettier": "^3.1.0",
+    "lodash": "^4.17.15",
+    "mocha": "^6.2.0",
+    "nlm": "^3.6.1",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^1.18.2"
+  },
+  "author": {
+    "name": "Groupon",
+    "email": "opensource@groupon.com"
+  },
+  "keywords": [
+    "memcached",
+    "stampede",
+    "cache"
+  ],
+  "files": [
+    "lib"
+  ],
+  "publishConfig": {
+    "registry": "https://registry.npmjs.org"
   }
 }
diff --git a/scripts/release.coffee b/scripts/release.coffee
deleted file mode 100755
index 5437772..0000000
--- a/scripts/release.coffee
+++ /dev/null
@@ -1,26 +0,0 @@
-#!/usr/bin/env coffee
-{exec} = require 'child_process'
-moduleInfo = require '../package.json'
-
-versionTag = 'v' + moduleInfo.version
-
-console.log "Releasing #{moduleInfo.name} #{versionTag}\n"
-
-findTagCmd = "git tag | grep #{versionTag}"
-exec findTagCmd, (err, stdout, stderr) ->
-  if not err?
-    throw new Error("Version #{versionTag} already exists")
-
-  # push to default remote
-  pushToRemoteCmd = "git push"
-  console.log '* Pushing latest changes...'
-  exec pushToRemoteCmd, (err, stdout, stderr) ->
-    if err?
-      throw new Error("Could not push. Do you have a default remote?")
-
-    console.log '* Tag version and push tags...'
-    makeTagCmd = "git tag #{versionTag} && git push --tags"
-    exec makeTagCmd, (err) ->
-      if err?
-        throw new Error("Failed to tag & push to remote")
-      console.log "\n=> Published version #{versionTag}\n"
diff --git a/src/backend.coffee b/src/backend.coffee
deleted file mode 100644
index d261896..0000000
--- a/src/backend.coffee
+++ /dev/null
@@ -1,52 +0,0 @@
-###
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-###
-
-backend = module.exports = {}
-typeMap = {}
-
-backend.addType = (type, klass) -> typeMap[type] = klass
-
-backend.create = (options) ->
-  options ?= {}
-
-  # make the whole thing idempotent
-  if 'function' is typeof options.get and 'function' is typeof options.set
-    return options
-
-  type = options.type ? 'noop'
-  klass = typeMap[type]
-  throw new Error("#{type} is not a supported cache backend type") unless klass?
-  new klass(options)
-
-backend.addType 'noop', require("./backends/noop")
-backend.addType 'memory', require("./backends/memory")
-backend.addType 'memcached', require("./backends/memcached")
diff --git a/src/backends/memcached.coffee b/src/backends/memcached.coffee
deleted file mode 100644
index 077ae4e..0000000
--- a/src/backends/memcached.coffee
+++ /dev/null
@@ -1,64 +0,0 @@
-###
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-###
-
-Memcached = require 'memcached'
-
-class MemcachedBackend
-  description = "Uses anything supporting the memcache protocol"
-
-  constructor: (options) ->
-    @type = 'memcached'
-
-    if options.client?
-      @client = options.client
-    else
-      hosts = options.hosts ? '127.0.0.1:11211'
-      @client = new Memcached hosts, options
-
-  get: (key, callback) ->
-    @client.get key, (err, answer) ->
-      answer = null if answer == false
-      if err? then callback(err) else callback(null, answer)
-
-  set: (key, value, options, callback) ->
-    @client.set key, value, options.expire, (err, ok) ->
-      if err? then callback(err) else callback(null, value)
-
-  unset: (key, callback) ->
-    delete @cache[key]
-    callback(null) if callback?
-    null
-
-  end: ->
-    @client.end()
-
-module.exports = MemcachedBackend
diff --git a/src/backends/memory.coffee b/src/backends/memory.coffee
deleted file mode 100644
index d6d6451..0000000
--- a/src/backends/memory.coffee
+++ /dev/null
@@ -1,68 +0,0 @@
-###
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-###
-
-class MemoryBackend
-  description = "Stores everything just in memory"
-
-  constructor: -> @cache = {}; @type = 'memory'
-
-  get: (key, callback) ->
-    if @isExpired(@cache[key]?.e)
-      delete @cache[key] # make sure it does not exist
-
-    callback(null, @cache[key]?.d ? null) if callback?
-    null
-
-  expiresAt: (seconds) ->
-    if seconds is 0 then 0
-    else (new Date()).getTime() + (parseInt(seconds) * 1000)
-
-  isExpired: (expires) ->
-    return false unless expires?
-    return false if expires is 0
-    # "now is greater than expires"
-    return (new Date()).getTime() > (new Date(expires)).getTime()
-
-  set: (key, value, options, callback) ->
-    @cache[key] =
-      d: value
-      e: @expiresAt(options.expire)
-
-    callback(null, value) if callback?
-    null
-
-  unset: (key, callback) ->
-    delete @cache[key]
-    callback(null) if callback?
-    null
-
-module.exports = MemoryBackend
diff --git a/src/backends/noop.coffee b/src/backends/noop.coffee
deleted file mode 100644
index 9402e73..0000000
--- a/src/backends/noop.coffee
+++ /dev/null
@@ -1,42 +0,0 @@
-###
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-###
-
-class NoopBackend
-  description = "Simple backend doing nothing"
-
-  constructor: -> @type = 'noop'
-
-  get: (key, callback) -> callback(null, null)
-  set: (key, value, options, callback) -> callback(null, value)
-  unset: (key, callback) -> callback(null)
-
-module.exports = NoopBackend
diff --git a/src/cache.coffee b/src/cache.coffee
deleted file mode 100644
index 4740166..0000000
--- a/src/cache.coffee
+++ /dev/null
@@ -1,169 +0,0 @@
-###
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-###
-
-{extend} = require 'underscore'
-Q = require 'q'
-Backend = require './backend'
-
-toPromise = (val) ->
-  # If val is a function, evaluate it first, convert into promise afterwards
-  if 'function' is typeof val
-    Q val()
-  else Q val
-
-expiresAt = (seconds) ->
-  if seconds is 0 then 0
-  else Date.now() + parseInt(seconds, 10) * 1000
-
-isExpired = (expires) ->
-  return false if expires is 0
-  Date.now() > new Date(expires).getTime()
-
-optionalOpts = (opts, cb) ->
-  if not cb? and 'function' is typeof opts
-    { cb: opts, opts: null }
-  else
-    { cb, opts }
-
-class Cache
-  constructor: ({backend, defaults, name}) ->
-    @defaults =
-      freshFor: 0
-      expire: 0
-
-    @name = name or 'default'
-    @prefix = "#{@name}:"
-
-    # stale keys that are loaded right now
-    @staleOrPending = {}
-
-    @setDefaults defaults
-    @setBackend backend
-
-  applyPrefix: (key) -> "#{@prefix}#{key}"
-
-  setDefaults: (defaults) ->
-    @defaults = @prepareOptions defaults
-
-  setBackend: (backendOptions) ->
-    backendOptions =
-      if 'string' is typeof backendOptions
-        { type: backendOptions }
-      else
-        backendOptions ? {}
-
-    @end()
-    @backend = Backend.create backendOptions
-
-  end: ->
-    @backend.end() if @backend?.end?
-
-  prepareOptions: (options) ->
-    extend {}, @defaults, options
-
-  set: (key, val, opts, cb) ->
-    {cb,opts} = optionalOpts(opts, cb)
-
-    key = @applyPrefix key
-
-    backend = @backend
-    opts = @prepareOptions opts
-
-    toPromise(val).then( (resolvedValue) ->
-      wrappedValue =
-        b: expiresAt(opts.freshFor)
-        d: resolvedValue
-
-      Q.npost backend, 'set', [ key, wrappedValue, opts ]
-    ).nodeify cb
-
-  # Every value we cache is wrapped to enable graceful expire:
-  # {
-  #   "d": <data, the actual data that is cached>
-  #   "b": <best before, timestamp when the data is considered stale>
-  # }
-  # This allows us to have stale values stored in the cache and fetch a
-  # replacement in the background.
-  getWrapped: (key) ->
-    Q.npost(@backend, 'get', [ key ])
-
-  get: (rawKey, cb) ->
-    key = @applyPrefix rawKey
-    @getWrapped(key).then(
-      (wrappedValue) ->
-        # blindly return the wrapped value, ignoring freshness
-        wrappedValue?.d ? null
-    ).nodeify cb
-
-  # Get from a cache or generate if not present or stale.
-  # A value is stale when it was generated more than `freshFor` seconds ago
-  getOrElse: (rawKey, val, opts, cb) ->
-    key = @applyPrefix rawKey
-
-    {cb,opts} = optionalOpts(opts, cb)
-    opts = @prepareOptions opts
-
-    refreshValue = =>
-      generatedValue = toPromise(val)
-
-      @set(rawKey, generatedValue, opts).then(
-        (rawValue) =>
-          delete @staleOrPending[key]
-          rawValue?.d ? null
-
-        (err) =>
-          # return generated value instead of error
-          # tracking backend errors should be done with wrapping your backend clients
-          delete @staleOrPending[key]
-          generatedValue ? null
-      )
-
-    verifyFreshness = (wrappedValue) =>
-      # best before is expired, we have to reload
-      hit = wrappedValue?
-      expired = isExpired wrappedValue?.b
-      loadingNewValue = @staleOrPending[key]?
-
-      if (!hit or expired) && !loadingNewValue
-        @staleOrPending[key] = refreshValue()
-
-      # Return the value even if it's stale, we want the result ASAP
-      wrappedValue?.d ? @staleOrPending[key]
-
-    handleError = (error) ->
-      # we should let the refreshValue method work if getWrapped has problems
-      # tracking backend errors should be done with wrapping your backend clients
-      return null
-
-    @getWrapped(key).catch(handleError).then(verifyFreshness).nodeify cb
-
-module.exports = Cache
diff --git a/src/cached.coffee b/src/cached.coffee
deleted file mode 100644
index 7fcb5ae..0000000
--- a/src/cached.coffee
+++ /dev/null
@@ -1,70 +0,0 @@
-###
-Copyright (c) 2014, Groupon, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-
-Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-
-Neither the name of GROUPON nor the names of its contributors may be
-used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-###
-
-try
-  # This makes sure we don't spam the CPU if we have our own Q
-  Q = require '../node_modules/q'
-  Q.stopUnhandledRejectionTracking()
-catch
-  Q = require 'q'
-
-Cache = require './cache'
-
-{extend} = require 'underscore'
-
-namedCaches = {}
-
-cached = (name="default", options={}) ->
-  options = extend { name }, options
-  namedCaches[name] ?= cached.createCache(options)
-
-cached.createCache = (options={}) ->
-  new Cache(options)
-
-cached.dropNamedCaches = () ->
-  namedCaches = {}
-  return cached
-
-cached.dropNamedCache = (name) ->
-  delete namedCaches[name]
-  return cached
-
-cached.knownCaches = ->
-  Object.keys namedCaches
-
-cached.deferred = (fn) ->
-  # a simple function that returns a promise of the execution of a
-  # given nodejs callback-style function `fn`
-  ->
-    Q.nfcall fn
-
-module.exports = cached
diff --git a/test/_backends.js b/test/_backends.js
new file mode 100644
index 0000000..923adcb
--- /dev/null
+++ b/test/_backends.js
@@ -0,0 +1,26 @@
+'use strict';
+
+/* eslint-env mocha */
+
+const { defaults } = require('lodash');
+
+const Cache = require('../lib/cache');
+
+const backendOptions = {
+  hosts: `${process.env.MEMCACHED__HOST || '127.0.0.1'}:11211`,
+};
+
+module.exports = function withBackends(createTestCases) {
+  ['memory', 'memcached'].forEach(backendType => {
+    describe(`with backend "${backendType}"`, () => {
+      const cache = new Cache({
+        backend: defaults({ type: backendType }, backendOptions),
+        name: 'awesome-name',
+        debug: true,
+      });
+      after(() => cache.end());
+
+      createTestCases(cache);
+    });
+  });
+};
diff --git a/test/_unhandled-rejection.js b/test/_unhandled-rejection.js
new file mode 100644
index 0000000..e55b345
--- /dev/null
+++ b/test/_unhandled-rejection.js
@@ -0,0 +1,19 @@
+'use strict';
+
+/* eslint no-console:0 */
+/* eslint-env mocha */
+
+const Bluebird = require('bluebird');
+
+const unhandledRejections = [];
+Bluebird.onPossiblyUnhandledRejection(error => {
+  console.error('Possibly unhandled rejection:', error.stack);
+  unhandledRejections.push(error);
+});
+
+after('Check for unhandled rejections', () => {
+  if (unhandledRejections.length) {
+    console.error('Found %d unhandled rejections', unhandledRejections.length);
+    throw unhandledRejections[0];
+  }
+});
diff --git a/test/cache.coffee b/test/cache.coffee
deleted file mode 100644
index 27aad6a..0000000
--- a/test/cache.coffee
+++ /dev/null
@@ -1,166 +0,0 @@
-
-expect = require 'expect.js'
-bond = require 'bondjs'
-
-Q = require 'q'
-{defaults} = require 'underscore'
-Cache = require '../lib/cache'
-cached = require '../lib/cached'
-
-cache = null
-values =
-  key1: 'Value 1'
-  key2: 'Value 2'
-  key3: 'Value 3'
-
-backendOptions =
-  hosts: if process.env.MEMCACHED__HOST then "#{process.env.MEMCACHED__HOST}:11211" else '127.0.0.1:11211'
-
-wait = (ms) ->
-  deferred = Q.defer()
-  setTimeout deferred.resolve, ms
-  deferred.promise
-
-describe 'Cache', ->
-  it 'always has a backend', ->
-    cache = new Cache {}
-    expect(cache.backend).not.to.be undefined
-
-  it 'has a "noop" backend by default', ->
-    cache = new Cache {}
-    expect(cache.backend.type).to.equal 'noop'
-
-  describe 'Cache#set', ->
-    beforeEach ->
-      cache = new Cache backend: 'memory'
-
-    it 'supports callback style', (done) ->
-      cache.set 'key1', values.key1, done
-
-    it 'supports promise style', (done) ->
-      cache.set('key2', values.key2, { expire: 1 }).nodeify done
-
-  [ 'memory', 'memcached' ].map (backendType) ->
-    describe "with backend \"#{backendType}\"", ->
-
-      beforeEach ->
-        cache = new Cache backend: defaults({ type: backendType }, backendOptions), name: 'awesome-name', debug: true
-      afterEach ->
-        cache.end()
-
-      describe 'Cache#get', ->
-        it 'gets a previously set key', (done) ->
-          [
-            ->
-              cache.set 'key1', values.key1
-            -> cache.get 'key1'
-            (val) ->
-              expect(val).to.be values.key1
-          ].reduce(Q.when, Q()).nodeify done
-
-        it 'is aware of expires', (done) ->
-          [
-            -> Q.all [
-              cache.set 'key1', values.key1, expire: 1
-              cache.set 'key2', values.key2, expire: 0
-              cache.set 'key3', values.key3, expire: 4
-            ]
-            -> wait 2000
-            -> Q.all [
-              cache.get 'key1'
-              cache.get 'key2'
-              cache.get 'key3'
-            ]
-            ([ val1, val2, val3 ]) ->
-              expect(val1).to.be null # less than 2 seconds lifetime
-              expect(val2).to.equal values.key2 # eternal lifetime
-              expect(val3).to.equal values.key3 # more than 2 seconds lifetime
-          ].reduce(Q.when, Q()).nodeify done
-
-      describe 'Cache#getOrElse', ->
-        it 'replaces values lazily', (done) ->
-          generatorCalled = 0
-          # generate a value in a certain time
-          valueGenerator = (v, ms) -> ->
-            ++generatorCalled
-            Q.delay(ms).then -> v
-
-          originalValue = values.key1
-          generatedValue = 'G1'
-
-          valueA = 'NOT_SET' # initial set
-          valueB = 'NOT_SET' # getOrElse #1 (should be original value)
-          valueC = 'NOT_SET' # getOrElse #2 (should be original value)
-          valueD = 'NOT_SET' # getOrElse #3 (should be generated value)
-
-          chainIsOver = false
-
-          # abstract:
-          # * First we set a value that is fresh for one second.
-          # * We then wait 1sec+ to be sure that the value is stale
-          # * When we #get the value now, it should be returned though it's stale
-          # * Then we call #getOrElse with an "expensive" value generator
-          # * #getOrElse should immediately return with the stale value while starting
-          #   to generate the new value in the background
-          # * While generation is running, a second call to #getOrElse should
-          #   - not start another value generator
-          #   - return immediately with the stale value
-          # * After generating the value is done we call #getOrElse a 3rd time. We should
-          #   be getting the generated value and not be starting another generator
-          [
-            -> cache.set 'key1', originalValue, freshFor: 1
-            -> wait 1200
-            -> cache.get('key1')
-            (v) -> expect(v).to.be originalValue
-
-            -> cache.getOrElse 'key1', valueGenerator(generatedValue, 100), freshFor: 5
-            (v) ->
-              expect(v).to.be originalValue
-            -> wait 50 # while generating
-            -> cache.getOrElse 'key1', valueGenerator('G2', 5000), freshFor: 5
-            (v) ->
-              expect(v).to.be originalValue
-            -> wait 100
-            -> cache.getOrElse 'key1', valueGenerator('G3', 5000), freshFor: 5
-            (v) ->
-              expect(v).to.be generatedValue
-              expect(generatorCalled).to.be 1
-          ].reduce(Q.when, Q()).nodeify done
-
-        it 'throws errors', (done) ->
-          errorGenerator = cached.deferred (cb) ->
-            cb new Error 'Big Error'
-
-          theCallback = (err, data) ->
-            expect(err)
-            expect(err.message).to.be 'Big Error'
-            expect(data).to.be undefined
-            done()
-
-          cache.getOrElse 'bad_keys', errorGenerator, freshFor: 1, theCallback
-
-        it 'handles thrown get errors by falling back on the value refresher', (done) ->
-          valueGenerator = cached.deferred (cb) ->
-            cb null, 'fresh cats'
-
-          theCallback = (err, data) ->
-            expect(err).to.be null
-            expect(data).to.be 'fresh cats'
-            done()
-
-          bond(cache, 'getWrapped').return Q.reject new Error('backend get troubles')
-
-          cache.getOrElse 'bad_get', valueGenerator, freshFor: 5, theCallback
-
-        it 'handles thrown set errors by falling back on the generated value', (done) ->
-          valueGenerator = cached.deferred (cb) ->
-            cb null, 'generated bunnies'
-
-          theCallback = (err, data) ->
-            expect(err).to.be null
-            expect(data).to.be 'generated bunnies'
-            done()
-
-          bond(cache, 'set').return Q.reject new Error('backend set troubles')
-
-          cache.getOrElse 'bad_set', valueGenerator, freshFor: 5, theCallback
diff --git a/test/cache.test.js b/test/cache.test.js
new file mode 100644
index 0000000..5e207c2
--- /dev/null
+++ b/test/cache.test.js
@@ -0,0 +1,17 @@
+'use strict';
+
+const assert = require('assertive');
+
+const Cache = require('../lib/cache');
+
+describe('Cache', () => {
+  it('always has a backend', () => {
+    const cache = new Cache({});
+    assert.truthy(cache.backend);
+  });
+
+  it('has a "noop" backend by default', () => {
+    const cache = new Cache({});
+    assert.equal('noop', cache.backend.type);
+  });
+});
diff --git a/test/cached.coffee b/test/cached.coffee
deleted file mode 100644
index d041d7d..0000000
--- a/test/cached.coffee
+++ /dev/null
@@ -1,25 +0,0 @@
-
-expect = require 'expect.js'
-
-cached = require '..'
-
-describe 'cached', ->
-  beforeEach ->
-    cached.dropNamedCaches()
-
-  it 'is a function', ->
-    expect(typeof cached).to.be 'function'
-
-  it 'can create different named caches', ->
-    expect(cached('foo')).not.to.be(cached('bar'))
-    expect(cached('foo')).not.to.be(cached())
-    expect(cached.knownCaches()).to.eql [ 'foo', 'bar', 'default' ]
-
-  it 'the default cache is named "default"', ->
-    expect(cached()).to.be(cached('default'))
-
-  it 'returns the same named cache for subsequent calls', ->
-    expect(cached('foo')).to.be(cached('foo'))
-
-  it 'knows no caches', ->
-    expect(cached.knownCaches()).to.eql []
diff --git a/test/cached.test.js b/test/cached.test.js
new file mode 100644
index 0000000..28690d4
--- /dev/null
+++ b/test/cached.test.js
@@ -0,0 +1,26 @@
+'use strict';
+
+const assert = require('assertive');
+
+const cached = require('..');
+
+describe('cached', () => {
+  beforeEach(() => cached.dropNamedCaches());
+
+  it('is a function', () => assert.hasType(Function, cached));
+
+  it('starts out with no known caches', () =>
+    assert.deepEqual([], cached.knownCaches()));
+
+  it('can create different named caches', () => {
+    assert.notEqual(cached('bar'), cached('foo'));
+    assert.notEqual(cached(), cached('foo'));
+    assert.deepEqual(['bar', 'foo', 'default'], cached.knownCaches());
+  });
+
+  it('the default cache is named "default"', () =>
+    assert.equal(cached('default'), cached()));
+
+  it('returns the same named cache for subsequent calls', () =>
+    assert.equal(cached('foo'), cached('foo')));
+});
diff --git a/test/get-or-else.test.js b/test/get-or-else.test.js
new file mode 100644
index 0000000..8ed8c98
--- /dev/null
+++ b/test/get-or-else.test.js
@@ -0,0 +1,158 @@
+'use strict';
+
+const assert = require('assertive');
+const Bluebird = require('bluebird');
+
+const Cache = require('../lib/cache');
+const withBackends = require('./_backends');
+
+function assertRejects(promise) {
+  return promise.then(
+    () => {
+      throw new Error('Did not fail as expected');
+    },
+    error => error
+  );
+}
+
+describe('Cache::getOrElse', () => {
+  describe('backed.get failing', () => {
+    let cache;
+    before(() => {
+      cache = new Cache({ backend: 'memory', name: 'awesome-name' });
+      cache.getWrapped = () =>
+        Bluebird.reject(new Error('backend get troubles'));
+    });
+
+    function generateCats() {
+      return 'fresh cats';
+    }
+
+    it('falls back on the value refresher', async () => {
+      const value = await cache.getOrElse('bad_get', generateCats, {
+        freshFor: 5,
+      });
+      assert.equal('fresh cats', value);
+    });
+  });
+
+  describe('backend.set failing', () => {
+    let cache;
+    before(() => {
+      cache = new Cache({ backend: 'memory', name: 'awesome-name' });
+      cache.set = () => Bluebird.reject(new Error('backend set troubles'));
+    });
+
+    function generateBunnies() {
+      return 'generated bunnies';
+    }
+
+    it('falls back on the generated value', async () => {
+      const value = await cache.getOrElse('bad_set', generateBunnies, {
+        freshFor: 5,
+      });
+      assert.equal('generated bunnies', value);
+    });
+  });
+
+  withBackends(cache => {
+    it('replaces values lazily', async () => {
+      let generatorCalled = 0;
+      // generate a value in a certain time
+      function valueGenerator(v, ms) {
+        return () => {
+          ++generatorCalled;
+          return Bluebird.resolve(v).delay(ms);
+        };
+      }
+
+      const originalValue = 'original-value';
+
+      // 1. Set the value with a freshFor of 1 second
+      await cache.set('key1', originalValue, { freshFor: 1 });
+      // 2. Wait more than 1 second (the value is now stale)
+      await Bluebird.delay(1200);
+      // 3. Make sure we can still retrieve the original value.
+      //    It's stale - but not expired/gone.
+      assert.equal(originalValue, await cache.get('key1'));
+
+      // 4. The value is stale, so it should be calling the value generator.
+      //    But it should *return* the original value asap.
+      assert.equal(
+        originalValue,
+        await cache.getOrElse('key1', valueGenerator('G1', 100), {
+          freshFor: 5,
+        })
+      );
+
+      // Let the generator be generating...
+      await Bluebird.delay(50);
+
+      // 5. Generating 'G1' in the last step takes 100ms but we only waited 50ms yet.
+      //    This means we still expect to see the original value.
+      //    'G2' should never be generated since there's already a pending value.
+      assert.equal(
+        originalValue,
+        await cache.getOrElse('key1', valueGenerator('G2', 5000), {
+          freshFor: 5,
+        })
+      );
+
+      // Let the generator be generating...
+      await Bluebird.delay(100);
+
+      // 6. Now G1 is done generating (we waited a total of 150ms), so we shouldn't
+      //    see the original value anymore but the new, improved 'G1'.
+      assert.equal(
+        'G1',
+        await cache.getOrElse('key1', valueGenerator('G3', 5000), {
+          freshFor: 5,
+        })
+      );
+
+      // 7. Making sure that the value generator was only called once during this test.
+      //    We just generated 'G1', the other times we either had a pending value
+      //    or the value was still fresh (last/'G3' call).
+      assert.equal(1, generatorCalled);
+    });
+
+    it('throws errors', async () => {
+      function errorGenerator() {
+        throw new Error('Big Error');
+      }
+
+      const error = await assertRejects(
+        cache.getOrElse('bad_keys', errorGenerator, { freshFor: 1 })
+      );
+      assert.equal('Big Error', error.message);
+    });
+
+    describe('refresh of expired value failing', () => {
+      const key = 'refresh-key';
+      const value = 'refresh-value';
+
+      before('set value that is stale after a second', () =>
+        cache.set(key, value, { freshFor: 1, expire: 3 })
+      );
+
+      before('wait >1 seconds', () => Bluebird.delay(1100));
+
+      function generator() {
+        return Bluebird.reject(new Error('Oops'));
+      }
+
+      it('returns the original value if generating a new value fails', async () => {
+        assert.equal(value, await cache.getOrElse(key, generator));
+      });
+
+      describe('after two more second', () => {
+        before('wait >2 seconds', () => Bluebird.delay(2100));
+
+        it('fails to return a value if generating fails again', async () => {
+          const error = await assertRejects(cache.getOrElse(key, generator));
+          assert.equal('Oops', error.message);
+        });
+      });
+    });
+  });
+});
diff --git a/test/get-set.test.js b/test/get-set.test.js
new file mode 100644
index 0000000..f87c9b2
--- /dev/null
+++ b/test/get-set.test.js
@@ -0,0 +1,84 @@
+'use strict';
+
+const assert = require('assertive');
+const Bluebird = require('bluebird');
+
+const withBackends = require('./_backends');
+
+describe('Cache::{get,set,unset}', () => {
+  withBackends(cache => {
+    it('get/set (callback style)', done => {
+      cache.set('callback-key', 'callback-value', setError => {
+        if (setError) return done(setError);
+        cache.get('callback-key', (getError, value) => {
+          if (getError) return done(getError);
+          let assertError = null;
+          try {
+            assert.equal('callback-value', value);
+          } catch (error) {
+            assertError = error;
+          }
+          return done(assertError);
+        });
+        return null;
+      });
+    });
+
+    it('get/set (promise style)', async () => {
+      await cache.set('promise-key', 'promise-value', { expire: 1 });
+      assert.equal('promise-value', await cache.get('promise-key'));
+    });
+
+    it('set/unset (callback style', done => {
+      cache.set('callback-key', 'callback-value', setError => {
+        if (setError) return done(setError);
+        cache.unset('callback-key', unsetError => {
+          if (unsetError) return done(unsetError);
+          cache.get('callback-key', (getError, value) => {
+            if (getError) return done(getError);
+            let assertError = null;
+            try {
+              assert.equal(null, value);
+            } catch (error) {
+              assertError = error;
+            }
+            return done(assertError);
+          });
+          return null;
+        });
+        return null;
+      });
+    });
+
+    it('set/unset (promise style)', async () => {
+      await cache.set('promise-key', 'promise-value', { expire: 1 });
+      await cache.unset('promise-key');
+      assert.equal(null, await cache.get('promise-key'));
+    });
+
+    it('honors expires', async () => {
+      const values = {
+        key1: 'Value 1',
+        key2: 'Value 2',
+        key3: 'Value 3',
+      };
+
+      await Bluebird.all([
+        cache.set('key1', values.key1, { expire: 1 }),
+        cache.set('key2', values.key2, { expire: 0 }),
+        cache.set('key3', values.key3, { expire: 4 }),
+      ]);
+
+      await Bluebird.delay(2000);
+
+      const [expired, eternal, hit] = await Bluebird.map(
+        ['key', 'key2', 'key3'],
+        key => cache.get(key)
+      );
+
+      assert.equal(null, expired);
+      assert.equal(values.key2, eternal);
+      assert.equal(values.key3, hit);
+    });
+  });
+});
diff --git a/test/mocha.opts b/test/mocha.opts
new file mode 100644
index 0000000..3e51a2f
--- /dev/null
+++ b/test/mocha.opts
@@ -0,0 +1,3 @@
+--recursive
+--timeout 6000
+--slow 4000
diff --git a/test/prefix.coffee b/test/prefix.coffee
deleted file mode 100644
index c6d9bf0..0000000
--- a/test/prefix.coffee
+++ /dev/null
@@ -1,24 +0,0 @@
-
-expect = require 'expect.js'
-Q = require 'q'
-
-cached = require '..'
-
-describe 'cache prefix', ->
-  it 'adds a prefix to named caches', (done) ->
-    cacheA = cached 'a', backend: { type: 'memory' }
-    cacheB = cached 'b'
-    # simulate "writing to the same store"
-    cacheB.backend = cacheA.backend
-
-    aValue = 'a-value'
-    bValue = 'b-value'
-
-    [
-      -> cacheA.set 'key', aValue
-      -> cacheB.set 'key', bValue
-      -> cacheA.get 'key'
-      (v) -> expect(v).to.be(aValue)
-      -> cacheB.get 'key'
-      (v) -> expect(v).to.be(bValue)
-    ].reduce(Q.when, Q()).nodeify done
diff --git a/test/prefix.test.js b/test/prefix.test.js
new file mode 100644
index 0000000..0f495b9
--- /dev/null
+++ b/test/prefix.test.js
@@ -0,0 +1,23 @@
+'use strict';
+
+const assert = require('assertive');
+
+const cached = require('..');
+
+describe('cache prefix', () => {
+  it('adds a prefix to named cached', async () => {
+    const cacheA = cached('a', { backend: { type: 'memory' } });
+    const cacheB = cached('b');
+    // Simulate writing to the same store
+    cacheB.backend = cacheA.backend;
+
+    const aValue = 'a-value';
+    const bValue = 'b-value';
+
+    await cacheA.set('key', aValue);
+    await cacheB.set('key', bValue);
+
+    assert.equal(aValue, await cacheA.get('key'));
+    assert.equal(bValue, await cacheB.get('key'));
+  });
+});
diff --git a/test/timeout.test.js b/test/timeout.test.js
new file mode 100644
index 0000000..b1d724f
--- /dev/null
+++ b/test/timeout.test.js
@@ -0,0 +1,83 @@
+'use strict';
+
+const assert = require('assertive');
+const Bluebird = require('bluebird');
+
+const identity = val => val;
+
+const Cache = require('../lib/cache');
+
+describe('Cache timeouts', () => {
+  const cache = new Cache({
+    backend: {
+      get() {
+        return Bluebird.resolve({ d: 'get result' }).delay(150);
+      },
+      set() {
+        return Bluebird.resolve('set result').delay(150);
+      },
+    },
+    name: 'awesome-name',
+    debug: true,
+  });
+
+  describe('with a timeout <150ms', () => {
+    before(() => (cache.defaults.timeout = 50));
+
+    it('get fails fast', async () => {
+      const err = await Bluebird.race([
+        cache.get('my-key').then(null, identity),
+        Bluebird.delay(100, 'too slow'), // this should not be used
+      ]);
+      assert.expect(err instanceof Error);
+      assert.equal('TimeoutError', err.name);
+    });
+
+    it('set fails fast', async () => {
+      const err = await Bluebird.race([
+        cache.set('my-key', 'my-value').then(null, identity),
+        Bluebird.delay(100, 'too slow'), // this should not be used
+      ]);
+      assert.expect(err instanceof Error);
+      assert.equal('TimeoutError', err.name);
+    });
+
+    it('getOrElse fails fast', async () => {
+      const value = await Bluebird.race([
+        cache.getOrElse('my-key', 'my-value').then(null, identity),
+        // We need to add a bit of time here because we'll run into the
+        // timeout twice - once when trying to read and once while writing.
+        Bluebird.delay(150, 'too slow'), // this should not be used
+      ]);
+      assert.equal('my-value', value);
+    });
+  });
+
+  describe('with a timeout >150ms', () => {
+    before(() => (cache.defaults.timeout = 250));
+
+    it('receives the value', async () => {
+      const value = await Bluebird.race([
+        cache.get('my-key').then(null, identity),
+        Bluebird.delay(200, 'too slow'), // this should not be used
+      ]);
+      assert.equal('get result', value);
+    });
+
+    it('sets the value', async () => {
+      const value = await Bluebird.race([
+        cache.set('my-key', 'my-value').then(null, identity),
+        Bluebird.delay(200, 'too slow'), // this should not be used
+      ]);
+      assert.equal('set result', value);
+    });
+
+    it('getOrElse can retrieve a value', async () => {
+      const value = await Bluebird.race([
+        cache.getOrElse('my-key', 'my-value').then(null, identity),
+        Bluebird.delay(200, 'too slow'), // this should not be used
+      ]);
+      assert.equal('get result', value);
+    });
+  });
+});