Cannot find module if the path contains illegal character

[csutorasa]

Expected Behaviour

Loaders work if the path contains # character.

Actual Behaviour

Webpack build fails with ERROR (tested on ts-loader and css-loader):

../../a#/ts-loader-path-issue/src/index.ts 39 bytes [not cacheable] [built] [code generated] [1 error]

ERROR in ../../a#/ts-loader-path-issue/src/index.ts
Module build failed (from ../../a#/ts-loader-path-issue/node_modules/ts-loader/index.js):
Error: Cannot find module 'C:\a#\ts-loader-path-issue\node_modules\ts-loader\index.js'
Require stack:
- C:\a#\ts-loader-path-issue\node_modules\loader-runner\lib\loadLoader.js
- C:\a#\ts-loader-path-issue\node_modules\loader-runner\lib\LoaderRunner.js
- C:\a#\ts-loader-path-issue\node_modules\webpack\lib\NormalModule.js
- C:\a#\ts-loader-path-issue\node_modules\webpack\lib\NormalModuleFactory.js
- C:\a#\ts-loader-path-issue\node_modules\webpack\lib\Compiler.js
- C:\a#\ts-loader-path-issue\node_modules\webpack\lib\webpack.js
- C:\a#\ts-loader-path-issue\node_modules\webpack\lib\index.js
- C:\a#\ts-loader-path-issue\node_modules\webpack-cli\lib\webpack-cli.js
- C:\a#\ts-loader-path-issue\node_modules\webpack-cli\lib\bootstrap.js
- C:\a#\ts-loader-path-issue\node_modules\webpack-cli\bin\cli.js
- C:\a#\ts-loader-path-issue\node_modules\webpack\bin\webpack.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
    at Function.Module._load (internal/modules/cjs/loader.js:725:27)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (C:\a#\ts-loader-path-issue\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
    at loadLoader (C:\a#\ts-loader-path-issue\node_modules\loader-runner\lib\loadLoader.js:19:17)
    at iteratePitchingLoaders (C:\a#\ts-loader-path-issue\node_modules\loader-runner\lib\LoaderRunner.js:182:2)
    at runLoaders (C:\a#\ts-loader-path-issue\node_modules\loader-runner\lib\LoaderRunner.js:395:2)
    at NormalModule.doBuild (C:\a#\ts-loader-path-issue\node_modules\webpack\lib\NormalModule.js:631:3)
    at NormalModule.build (C:\a#\ts-loader-path-issue\node_modules\webpack\lib\NormalModule.js:775:15)
    at C:\a#\ts-loader-path-issue\node_modules\webpack\lib\Compilation.js:1236:12

Steps to Reproduce the Problem

On Windows 10 with run these commands in PowerShell (tested with 5.1):

mkdir C:\a#
cd C:\a#
git clone https://github.com/csutorasa/ts-loader-path-issue.git
cd ts-loader-path-issue
npm install
.\node_modules\.bin\webpack
# if webpack fails set execution policy and run the last command again
# Set-ExecutionPolicy Bypass -Scope Process -Force

On Linux run these commands in bash (tested with 5.0.17):

mkdir -p ~/a#
cd ~/a#
git clone https://github.com/csutorasa/ts-loader-path-issue.git
cd ts-loader-path-issue
npm install
node_modules/.bin/webpack

Location of a Minimal Repository that Demonstrates the Issue.

https://github.com/csutorasa/ts-loader-path-issue (ts-loader repo)
https://github.com/csutorasa/loader-path-issue (css-loader repo)

[davidecarlier]

This took me some time to track down on a coworker machine.
The error happened with style-loader and with html-loader.

This is the log:

ERROR in ../../###projects###/cc-widget-contact/src/css/main.css
Module build failed (from ../../###projects###/cc-widget-contact/node_modules/style-loader/dist/cjs.js):
Error: Cannot find module 'D:\###projects###\cc-widget-contact\node_modules\style-loader\dist\cjs.js'
Require stack:
- D:\###projects###\cc-widget-contact\node_modules\loader-runner\lib\loadLoader.js
- D:\###projects###\cc-widget-contact\node_modules\loader-runner\lib\LoaderRunner.js
- D:\###projects###\cc-widget-contact\node_modules\webpack\lib\NormalModule.js
- D:\###projects###\cc-widget-contact\node_modules\webpack\lib\NormalModuleFactory.js
- D:\###projects###\cc-widget-contact\node_modules\webpack\lib\Compiler.js
- D:\###projects###\cc-widget-contact\node_modules\webpack\lib\webpack.js
- D:\###projects###\cc-widget-contact\node_modules\webpack\lib\index.js
- D:\###projects###\cc-widget-contact\node_modules\webpack-cli\lib\webpack-cli.js
- D:\###projects###\cc-widget-contact\node_modules\webpack-cli\lib\bootstrap.js
- D:\###projects###\cc-widget-contact\node_modules\webpack-cli\bin\cli.js
- D:\###projects###\cc-widget-contact\node_modules\webpack\bin\webpack.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:793:17)
    at Function.Module._load (internal/modules/cjs/loader.js:686:27)
    at Module.require (internal/modules/cjs/loader.js:848:19)
    at require (D:\###projects###\cc-widget-contact\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
    at loadLoader (D:\###projects###\cc-widget-contact\node_modules\loader-runner\lib\loadLoader.js:19:17)
    at iteratePitchingLoaders (D:\###projects###\cc-widget-contact\node_modules\loader-runner\lib\LoaderRunner.js:182:2)
    at runLoaders (D:\###projects###\cc-widget-contact\node_modules\loader-runner\lib\LoaderRunner.js:397:2)
    at NormalModule.doBuild (D:\###projects###\cc-widget-contact\node_modules\webpack\lib\NormalModule.js:646:3)
    at NormalModule.build (D:\###projects###\cc-widget-contact\node_modules\webpack\lib\NormalModule.js:791:15)
    at D:\###projects###\cc-widget-contact\node_modules\webpack\lib\Compilation.js:1242:12
 @ ../../###projects###/cc-widget-contact/src/index.js 1:0-24