add code generation phase to Compilation
add `output.iife` options to remove iife wrapper
add `experiments.outputModule` which enabled `output.module`
add `output.module` which sets defaults to `output.iife: false`, `output.libraryTarget: "module"`, `output.jsonpScriptType: "module"`, `terserOptions.module: true`
add `output.module` example
improve runtime requirements needed by ConcatenatedModule
add entry inlining, which inlines entry module code into runtime scope (only when safe)
make whole bundle strict when all modules are strict
fix a bug with prefetching initial chunks
InitFragments have get[End]Content methods which get a sourceContext
RuntimeModules have implicit chunk and compilation
changed default to `output.ecmaVersion: 2015`
Chunks are now always in ChunkGroups
ChunkGroups have parents and children, Chunks no longer have this
AsyncDependenciesBlocks point to a ChunkGroup instead of a list of chunks
Entrypoint is now a ChunkGroup (extends from it)
move stuff graph modification methods into GraphHelpers
Change chunk id recording to source-based
Chunks have parents, siblings and children in Stats
rename AutomaticCommonsChunksPlugin to SplitChunksPlugin
add request property to origin (ChunkGroup)
remove moveToParent from AggressiveMergingPlugin
fix issues with AggressiveSplittingPlugin
remove CommonsChunkPlugin
add optimization.runtimeChunk (RuntimeChunkPlugin)
fix a filename bug for initial chunks
remove extract-text-webpack-plugin from test suite
add DebugHash to help debugging hash issues
fix issues with entry modules in different chunk as runtime
redo optimization.splitChunks options
Compilation.entrypoints is now a Map
Compilation.chunkGroups has been added
remove some unittests
update examples
update tests with CommonsChunkPlugin
exportsType falsy: It's non-harmony module
exportsType "namespace": It's a harmony module, the exports is the namespace object
exportsType "default": It's a harmony module, the exports is the default exports, named exports are properties of the default export