Note: v3 beta is now available on npm under the next tag

v3 Roadmap

General stuff

• BREAKING: Drop support for Node.js 4 and Node.js 6 (Update dependencies for node-fetch v3.x #489, Drop support for Node.js 4.x  #624)
• Update devDependencies (related to Update dependencies for node-fetch v3.x #489)
• When users clone(), automatically create streams with custom highWaterMark (When users clone(), automatically create streams with custom highWaterMark #386, PR open: Allow setting custom highWaterMark via node-fetch options (#386) #671)
• Bundle TypeScript types (Support for TypeScript without need of installing @types/node-fetch package) (feat: Migrated types #669)
• Replace Rollup with Microbundle (Plans to drop babel in v3 #643)
• Introduce linting to the project (Introduce linting to the project #303)
• Simplify Travis CI build matrix (related to Too big of a Travis CI matrix #431) - Dropping support for Node.js 4 & 6 will help
• Response.statusText should not default (Response.statusText should not default #578)
• Use w3c defined message for AbortError (Use w3c defined message for AbortError #657)
• URL is not encoded as UTF-8 (URL is not encoded as UTF-8 #245)
• Deprecate timeout in favor of AbortController (Should we deprecate timeout in favor of AbortController? #523)
• Data URI support (feat: Data URI support #659)
• Drop the optional dependency on encoding and move charset detection into a separate package. (In progress: Richienb/fetch-charset-detection (PR Open: refactor: Replace encoding with fetch-charset-detection. #694))
• Drop existing blob implementation code and use fetch-blob as dependency instead (v3 Roadmap #668 (comment))
• Fix stream piping (missing response stream error events #309, PR open: Fix stream piping #670)
• Fix stream resolving (Response promise resolves before response closes #642, Response.json() never resolves #665)
• Do not use constructor.name to check object (Do not use constructor.name to check object #667, PR open: fix: Better object checks #673)
• Properly forward request errors while piping response stream
• Convert Content-Encoding to lowercase (When server's Content-Encoding: GZip, response won't decompress #661, PR open: fix: Convert Content-Encoding to lowercase #672)
• More tests for data URI (v3 Roadmap #668 (comment))
• Drop credentials before redirection (When redirecting to a different host, strip Authorization header #274)
• Modernise the code behind FetchError and AbortError (v3 Roadmap #668 (comment))
• Propagate size and timeout to cloned response (Propagate size and timeout to cloned response #664)
• Replace the calls to url.parse and url.resolve with calls to new URL to use the new UTF-8 awareness and remove the utf8 package.
  • url.parse (refactor: Replace url.parse with new URL() #701)
  • url.resolve (e3cd4d2)
• Document types of fetch errors more thoroughly (Document types of fetch errors more thoroughly  #549)
• Should update host if there's a redirection (Redirect-following error (HTTP -> HTTPS + naked domain -> www subdomain) #570, PR Open: fix: Update host if there's a redirection #596)
• High priority doesn't correctly handle multiple content-type values (doesn't correctly handle multiple content-type values #783)

Additional:

• HTTP/2 support (Support HTTP/2 #342, PR open: chore: http2 support (WIP) #796)
• Plugin/middleware system (v3 Roadmap #668 (comment), PR open: feat: Add basic middleware functionality #677)
• WebStream API support (WebStream API support #387) - needs more discussion and standard.
• Support trailers (Support trailers #330) - trailer support has been removed (Consider removing trailers API whatwg/fetch#772).
• Caching (Offer caching #68) - would likely require opinionated implementation.
• Cookies (cookie jar #94) - would likely require opinionated implementation.

Other

• Enable Dependabot to automatically update dependencies if they pass tests and are within an appropriate version range.
• A way to back/sponsor the project (A way to back/sponsor the project #680)
• Create a final v2 release before releasing v3
• Update upgrade guide
• Release v1.x version of Richienb/fetch-charset-detection before release.
• Add this package to DefinitelyTyped/DefinitelyTyped/master/notNeededPackages.json since we now ship the typings.

cc @bitinn @jimmywarting @TimothyGu @jkantr @gr2m @Richienb