💻

• Would you like to work on a fix? (not sure if I can help on it but I can try 😛)

How are you using Babel?

@babel/eslint-parser

Input code

Here is the repository: https://github.com/devfservant/babel-eslint-parser-error/

Configuration file name

babel.config.js

Configuration

const getBaseConfig = () => ({
  presets: [
    [
      '@babel/preset-env',
      {
        debug: false,
        targets: {
          node: 'current',
          browsers: ['ie 11', '>0.15%', 'not dead', 'not op_mini all'],
        },
      },
    ],
    '@babel/preset-react',
  ],
  plugins: [
    ['babel-plugin-styled-components', { fileName: false }],
    ['@babel/plugin-transform-runtime', { corejs: 3 }],
    '@babel/plugin-syntax-dynamic-import',
  ],
})

module.exports = (api) => {
  api.cache(true)

  const baseConfig = getBaseConfig()

  if (process.env.NODE_ENV !== 'test') {
    baseConfig.ignore = [
      '**/__snapshots__/**',
      '**/*.test.js',
      '**/*.test.jsx',
      '**/*.test.ts',
      '**/*.test.tsx',
    ]

    // If not in tests, add the babel assets import plugin
    baseConfig.plugins.push([
      'transform-assets-import-to-string',
      { baseDir: '/assets' },
    ])
  }

  return baseConfig
}

Current and expected behavior

Current behaviour

The command npx eslint "packages/**" --debug is crashing with the error:

eslint:linter Parsing error: Cannot read property 'push' of undefined
eslint:linter TypeError: Cannot read property 'push' of undefined
  at maybeParse (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\@babel\eslint-parser\lib\worker\maybeParse.cjs:24:19)
  at handleMessage (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\@babel\eslint-parser\lib\worker\index.cjs:31:16)
  at exports.maybeParse (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\@babel\eslint-parser\lib\client.cjs:9:41)
  at baseParse (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\@babel\eslint-parser\lib\index.cjs:47:7)
  at Object.exports.parseForESLint (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\@babel\eslint-parser\lib\index.cjs:63:15)
  at parse (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\eslint\lib\linter\linter.js:655:22)
  at Linter._verifyWithoutProcessors (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\eslint\lib\linter\linter.js:1129:33)
  at Linter._verifyWithoutProcessors (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\eslint-plugin-eslint-comments\lib\utils\patch.js:166:36)       
  at Linter._verifyWithConfigArray (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\eslint\lib\linter\linter.js:1273:21)
  at Linter.verify (C:\Users\me\Workspace\babel-eslint-parser-error\node_modules\eslint\lib\linter\linter.js:1228:25) +5ms

(see babel-eslint-parser-error#debug-logs for more details)

Expected behaviour

No error

Environment

System:
OS: Windows 10 10.0.19042
Binaries:
Node: 12.20.1 - C:\Program Files\nodejs\node.EXE
Yarn: 1.22.10 - ~\AppData\Roaming\npm\yarn.CMD
npm: 6.14.10 - C:\Program Files\nodejs\npm.CMD
Monorepos:
Yarn Workspaces: 1.22.10
Lerna: 4.0.0
npmPackages:
@babel/cli: ^7.13.16 => 7.14.3
@babel/core: ^7.14.2 => 7.14.3
@babel/eslint-parser: ^7.14.2 => 7.14.3
@babel/eslint-plugin: ^7.13.16 => 7.13.16
@babel/plugin-syntax-dynamic-import: ^7.8.3 => 7.8.3
@babel/plugin-transform-runtime: ^7.14.2 => 7.14.3
@babel/preset-env: ^7.14.2 => 7.14.2
@babel/preset-react: ^7.13.13 => 7.13.13
@babel/runtime-corejs3: ^7.14.0 => 7.14.0
babel-plugin-styled-components: ^1.12.0 => 1.12.0
babel-plugin-transform-assets-import-to-string: ^1.2.0 => 1.2.0
eslint: ^7.26.0 => 7.26.0
jest: ^26.6.3 => 26.6.3
lerna: ^4.0.0 => 4.0.0

Possible solution

No response

Additional context

I faced this issue using a monorepo project (managed with lerna).
I got this error when switching from babel-eslint / babel-eslint-plugin
to @babel/eslint-parser / @babel/eslint-plugin (following https://babeljs.io/blog/2020/07/13/the-state-of-babel-eslint#the-future and https://stackoverflow.com/a/63489530/12292636)

Thanks a lot for your help,
if I can contribute just tell me and I'll try to do my best 🙏