to keep track of runtimes, used exports depending on runtime
modules can have different hashes and generated code depending on runtime
chunks are only considered as equal for MergeDuplicateChunks and SplitChunks when exports used in contained modules are equal
added `optimization.usedExports: "global"` to opt-out from used exports analysis per runtime
added `splitChunks.usedExports` and `splitChunks.cacheGroups[x].usedExports` to enable/disable used exports comparing for modules
`splitChunks.usedExports` defaults to `true` in production
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
As i walk through the source, i've tried to trace the webpack running stack.
Then, i find the missing constructors result in uncleasr stack and create a patch
for them.