[Full Changelog](https://github.com/nodegit/nodegit/compare/v0.17.0...v0.18.0)

- All callbacks that go to libgit2 now have an optional `waitForResult` flag that can be `true`/`false`. Defaults to false. When true it will not stop libgit2 from continuing on before the JS code is fully executed and resolved (in cases of a Promise). This is useful for progress callbacks (like fetching) where the bubbling up of the progress to JS doesn't really need the C/C++ code to wait for the JS code to fully handle the event before continuing. This can have serious performance implications for many callbacks that can be fired quite frequently.

- `given_opts` in `Revert.revert` are now optional

- `checkout_opts` in `Reset.fromAnnotated` and `Reset.reset` are now optional

- `Reset.fromAnnotated` is now async

- `message` on `Stash.save` is now optional

- `options` on `Stash.apply` and `Stash.pop` is now optional

- Added `processMergeMessageCallback` on `Repository#mergeBranches` to allow for custom merge messages

- Add `beforeFinishFn` to `Repository#rebaseBranches` and `Repository#continueRebase`. This is called before the invocation of `finish()`. If the callback returns a promise, `finish()` will be called when the promise resolves. The `beforeFinishFn` will be called with an object that has on it:

- `ontoName` The name of the branch that we rebased onto

- `ontoSha` The sha that we rebased onto

- `originalHeadName` The name of the branch that we rebased

- `originalHeadSha` The sha of the branch that was rebased

- `rewitten` which is an array of sha pairs that contain which contain what the commit sha was before the rebase and what the commit sha is after the rebase

[PR #1123](https://github.com/nodegit/nodegit/pull/1223) bumped libgit2 which brought in many changes and bug fixes.

- [Use a shared buffer in calls of git_treebuilder_write to avoid heap contention #3892](https://github.com/libgit2/libgit2/pull/3892)

- [WinHTTP: set proper error messages when SSL fails #4050](https://github.com/libgit2/libgit2/pull/4050)

- [Clang analyzer run #4051](https://github.com/libgit2/libgit2/pull/4051)

- [Extend packfile in increments of page_size. #4053](https://github.com/libgit2/libgit2/pull/4053)

- [Fix general example memory leaks #4078](https://github.com/libgit2/libgit2/pull/4078)

- [WIP: some coverity & compiler warning fixes #4086](https://github.com/libgit2/libgit2/pull/4086)

- [Fix a few recent warnings #4087](https://github.com/libgit2/libgit2/pull/4087)

- [Fix uninitialized variable warning #4095](https://github.com/libgit2/libgit2/pull/4095)

- [Update docs for git_oid_fromstrn and p #4096](https://github.com/libgit2/libgit2/pull/4096)

- [Fix digest credentials for proxy in windows #4104](https://github.com/libgit2/libgit2/pull/4104)

- [Vector reverse overflow #4105](https://github.com/libgit2/libgit2/pull/4105)

- [Flag given_opts in git_revert as optional #4108](https://github.com/libgit2/libgit2/pull/4108)

- [Flag checkout_opts in git_reset as optional #4109](https://github.com/libgit2/libgit2/pull/4109)

- [dirname with DOS prefixes #4111](https://github.com/libgit2/libgit2/pull/4111)

- [Add support for lowercase proxy environment variables #4112](https://github.com/libgit2/libgit2/pull/4112)

- [Flag options in git_stash_apply and git_stash_pop as being optional #4117](https://github.com/libgit2/libgit2/pull/4117)

- [rename detection: don't try to detect submodule renames #4119](https://github.com/libgit2/libgit2/pull/4119)

- [tests: fix permissions on testrepo.git index file #4121](https://github.com/libgit2/libgit2/pull/4121)

- [negotiate always fails via libcurl #4126](https://github.com/libgit2/libgit2/pull/4126)

- [Fix proxy auto detect not utilizing callbacks #4097](https://github.com/libgit2/libgit2/pull/4097)

- Don't overwrite C++ files for things that haven't changed [PR #1091](https://github.com/nodegit/nodegit/pull/1091)

- Add the option to "fire and forget" callbacks so libgit2 doesn't wait for JS to finish before proceeding [PR #1208](https://github.com/nodegit/nodegit/pull/1208)

- Send back the error code from libgit2 when a call fails [PR #1209](https://github.com/nodegit/nodegit/pull/1209)

- Initialize pointers to null [PR #1210](https://github.com/nodegit/nodegit/pull/1210)

- Replace Gitter with Slack [PR #1212](https://github.com/nodegit/nodegit/pull/1212)

- Make `given_opts` in `Revert.revert` optional [PR #1213](https://github.com/nodegit/nodegit/pull/1213)

- Make `Reset.fromAnnotated` async and `checkout_opts` optional [PR #1214](https://github.com/nodegit/nodegit/pull/1214)

- Make `message` on `Stash.save` optional [PR #1215](https://github.com/nodegit/nodegit/pull/1215)

- Add `Remote.ls` to NodeGit [PR #1218](https://github.com/nodegit/nodegit/pull/1218)

- Add `processMergeMessageCallback` to `Repository#mergeBranches` to allow for custom merge messages [PR #1219](https://github.com/nodegit/nodegit/pull/1219)

- Bump libgit2 to 43275f5 [PR #1223](https://github.com/nodegit/nodegit/pull/1223) from srajko/bump-libgit

- Provide rebase details on finish [PR #1224](https://github.com/nodegit/nodegit/pull/1224)

- Use wider int to calculate throttle window [PR #1232](https://github.com/nodegit/nodegit/pull/1232)

- Update comment to reflect the correct path for generated code output [PR #1236](https://github.com/nodegit/nodegit/pull/1236)

- Remove nwjs example from the docs [PR #1238](https://github.com/nodegit/nodegit/pull/1238)

- Remove `sudo` requirement from linux 32-bit builds [PR #1241](https://github.com/nodegit/nodegit/pull/1241)