webpack-cli v4-beta.8 ignoring loader's error.

[mstssk]

Describe the bug

webpack-cli v4-beta.8 ignoring loader's error.

Reproduction code: https://github.com/mstssk/webpack-cli-v4-beta8-ignore-loader-error

I wrote reproduction code of ts-loader, but this problem occurs with other loaders. e.g. file-loader.

What is the current behavior?

webpack-cli v3.3.11 fails and returns exit code 2 when an error occurs in loaders.
But webpack-cli v4.0.0-beta.8 does not fail and return exit code 0.

To Reproduce

Steps to reproduce the behavior:

1. Setup webpack@4.43.0, webpack-cli@4.0.0-beta.8, and some loaders
2. Write codes which raise error in loaders.
3. Run webpack
4. See error logs and status code.

Expected behavior

webpack fails and returns non-zero exit code when an error occurs in loaders.

Screenshots

Please paste the results of webpack-cli info here, and mention other relevant information

webpack-cli info fails in my env.

`webpack-cli info` Log

 $ npx webpack-cli info
[webpack-cli] Promise rejection: TypeError: Cannot convert undefined or null to object
[webpack-cli] TypeError: Cannot convert undefined or null to object
    at Function.entries (<anonymous>)
    at Object.<anonymous> (/private/tmp/webpack-cli-v4-beta8-ignore-loader-error/node_modules/@webpack-cli/info/index.js:45:41)
    at Generator.next (<anonymous>)
    at /private/tmp/webpack-cli-v4-beta8-ignore-loader-error/node_modules/@webpack-cli/info/index.js:8:71
    at new Promise (<anonymous>)
    at __awaiter (/private/tmp/webpack-cli-v4-beta8-ignore-loader-error/node_modules/@webpack-cli/info/index.js:4:12)
    at Object.info [as default] (/private/tmp/webpack-cli-v4-beta8-ignore-loader-error/node_modules/@webpack-cli/info/index.js:44:12)
    at Function.run (/private/tmp/webpack-cli-v4-beta8-ignore-loader-error/node_modules/webpack-cli/lib/commands/ExternalCommand.js:34:51)
    at WebpackCLI.runCommand (/private/tmp/webpack-cli-v4-beta8-ignore-loader-error/node_modules/webpack-cli/lib/webpack-cli.js:286:60)
    at runCLI (/private/tmp/webpack-cli-v4-beta8-ignore-loader-error/node_modules/webpack-cli/lib/bootstrap.js:61:26)

Additional context

#1222 (comment)

[consp1racy]

✖ ｢atl｣: Checking finished with 2 errors

and exits with 0.

[alexander-akait]

/cc @webpack/cli-team need fix and tests

[snitin315]

I will debug it.

[snitin315]

@mstssk I have the following observations

with webpack-4 and webpack-cli@3 - (As expected)

with webpack-4 and webpack-cli@4.0.0-beta.8 - (Not as expected)

with webpack@next and webpack-cli next branch (As expected)

[snitin315]

Expected behavior
webpack fails and returns exit code 0 when an error occurs in loaders.

Exit code 0 means the code was executed successfully without any failures. So if webpack fails it should exit with a non-zero exit code. Please correct me if I'm wrong.

[mstssk]

@snitin315 Thank you for your help.

Expected behavior
webpack fails and returns exit code 0 when an error occurs in loaders.

Oops! I typoed it.
non-zero exit code is correct.

I edit this issue's description.
Thank you.

[snitin315]

I think then it's working as expected against the webpack-cli next branch I will add tests for the same.

[alexander-akait]

@snitin315 Can you add test on this?

[snitin315]

Yes. Work in progress.