Version 4.0.0-alpha.2

Minor

• Transpile and polyfill for Node.js v6.10+ (down from v7.6+) to support AWS Lambda, fixing #33.
• Modular project structure that works better for native ESM.
• Added tests.
• Set up Travis to test using the latest stable Node.js version and the oldest supported in package.json engines (v6.10).
• Added a Travis readme badge.
• Improved error handling, fixing #26:
  • Custom errors are thrown or emitted with meaningful messages that are exported so consumers can use instanceof with them.
  • Where it makes sense, errors cause relevant HTTP status codes to be set in middleware.
  • Misordered multipart fields cause processRequest to throw MapBeforeOperationsUploadError and FilesBeforeMapUploadError errors in middleware.
  • The map field provided by the client is used to naively check the maxFiles option is not exceeded for a speedy MaxFilesUploadError error in middleware. The real number of files parsed is checked too, incase the request is malformed.
  • If files are missing from the request the scalar Upload promises reject with a FileMissingUploadError error.
  • Already if a file exceeds the maxFileSize option the file is truncated, the stream emits a limit event and stream.truncated === true. Now an error event is also emitted with a MaxFileSizeUploadError.
  • Aborting requests from the client causes scalar Upload promises to reject with a UploadPromiseDisconnectUploadError error for file upload streams that have not yet been parsed. For streams being parsed an error event is emitted with an FileStreamDisconnectUploadError error and stream.truncated === true. It is up to consumers to cleanup aborted streams in their resolvers.

Patch

• Updated dependencies.
• Smarter Babel config with .babelrc.js.
• Refactor to use fewer Busboy event listeners.