Strange webpack warnings during SJS builds

[pshirshov]

When I build my project for ScalaJS fastOptJS:webpack/fullOptJS:webpack tasks are throwing multiple strange warnings:

[warn] ./<ARTIFACT>-sjs-0.0.1-SNAPSHOT-fullopt.js
[warn] (Emitted value instead of an instance of Error) Cannot find source file '../../../../../../../../../../../lihaoyi/Github/fastparse/out/fastparse/js/2.12.7/generatedSources/dest/fastparse/SequencerGen.scala': Error: Can't resolve '../../../../../../../../../../../lihaoyi/Github/fastparse/out/fastparse/js/2.12.7/generatedSources/dest/fastparse/SequencerGen.scala' in '/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main'
[warn] NonErrorEmittedError: (Emitted value instead of an instance of Error) Cannot find source file '../../../../../../../../../../../lihaoyi/Github/fastparse/out/fastparse/js/2.12.7/generatedSources/dest/fastparse/SequencerGen.scala': Error: Can't resolve '../../../../../../../../../../../lihaoyi/Github/fastparse/out/fastparse/js/2.12.7/generatedSources/dest/fastparse/SequencerGen.scala' in '/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main'
[warn]     at emitWarning (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/webpack/lib/NormalModule.js:116:16)
[warn]     at /Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/source-map-loader/index.js:65:7
[warn]     at onError (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:65:10)
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at runAfter (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:158:4)
[warn]     at innerCallback (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:146:3)
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at next (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/tapable/lib/Tapable.js:252:11)
[warn]     at /Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/UnsafeCachePlugin.js:40:4
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at runAfter (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:158:4)
[warn]     at innerCallback (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:146:3)
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at next (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/tapable/lib/Tapable.js:252:11)
[warn]     at innerCallback (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:144:11)
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at next (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/tapable/lib/Tapable.js:249:35)
[warn]     at /Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/DescriptionFilePlugin.js:44:6
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at afterInnerCallback (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:168:10)
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at next (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/tapable/lib/Tapable.js:252:11)
[warn]     at afterInnerCallback (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:168:10)
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at next (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/tapable/lib/Tapable.js:252:11)
[warn]     at runAfter (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:158:4)
[warn]     at innerCallback (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:146:3)
[warn]     at loggingCallbackWrapper (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
[warn]     at next (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/tapable/lib/Tapable.js:252:11)
[warn]     at runAfter (/Users/<USER>/work/pf/<PROJECT>-toolchain-core/<ARTIFACT>/<ARTIFACT>-sjs/.js/target/scala-2.12/scalajs-bundler/main/node_modules/enhanced-resolve/lib/Resolver.js:158:4)
[warn]  @ multi ./<ARTIFACT>-sjs-0.0.1-SNAPSHOT-fullopt.js

I'm not sure if it's a fastparse issue but I'm using many other libraries (cats, circe, zio, etc, etc) and webpack whines only about fastparse.

I don't know what is it exactly, but these paths looks very strange:

../../../../../../../../../../../lihaoyi/Github/fastparse/out/fastparse/js/2.12.7/generatedSources/dest/fastparse/SequencerGen.scala