• Operating System: Fedora 32
• Node Version: 12
• NPM Version: 6
• webpack Version: 4
• terser-webpack-plugin Version: 4.2.0

Expected Behavior

extractComments to extract and add a banner always.

Actual Behavior

extractComments doesn't reliably add the banner. Sometimes, maybe 50% of the time, it will remove comments, but won't add the banner. The [contenthash] is the same regardless which causes caching and SRI issues as the hash does not reflect the content without the banner.

Code

I can try to provide code, but I noticed the tests for extractComments is failing so possibly that will help.

https://github.com/webpack-contrib/terser-webpack-plugin/runs/1103414191?check_suite_focus=true

FAIL test/minify-option.test.js
  ● Console

    console.log
      Current webpack version: 4

      at Object.<anonymous> (test/helpers/snapshotResolver.js:10:9)

  ● minify option › should snapshot with extracting comments

    EINVAL: invalid argument, rmdir '/Users/runner/work/terser-webpack-plugin/terser-webpack-plugin/node_modules/.cache/terser-webpack-plugin/content-v2/sha512/12/ec'

How Do We Reproduce?

See above.