[no-unused-vars] Exception hit with string-key enums (previewing typescript-eslint v.4.0.0-alpha.8)

Repro

{
  "root": true,
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": {}
  },
  "env": {
    "node": true,
    "browser": true
  },
  "plugins": [
    "@typescript-eslint",
    "unused-imports"
  ],
  "rules": {
    "unused-imports/no-unused-vars": "warn"
  }
}

enum Colors {
  "Red" = 1,
  "Blue" = 2,
  "Green" = 3,
}

Expected Result

Warning over Colors, since it is unused in the file.

Actual Result

None - error is hit: “Cannot read property ‘loc’ of undefined Occurred while linting …/test.ts:1”

Additional Info

This is testing the latest alpha v4 of typescript-eslint; it’s likely due to some backwards-incompatible change for this plugin (I haven’t dug into the source yet).

Context: I’m looking to adopt this plugin at my company to clean up our old imports. So far, it’s working really slick! The only snag is that I had to add a commit stripping out our string-keyed enums (and we needed the latest typescript-eslint due to bugs with the underlying rule that have been addressed in the major rewrite).

To be clear, this error is only hit when running this plugin with typescript-eslint/eslint-plugin@v.4.0.0-alpha.8. The typescript-eslint rule does not hit this error, and latest versions of both plugins are fine, too. This is more a heads-up for down the line. 😃 (and/or if I have time to look into it sooner)

It is possible to bypass this failure by removing the string-keyed enums, i.e.:

enum Colors {
  Red = 1,
  Blue = 2,
  Green = 3,
}

Versions

package	version
@typescript-eslint/eslint-plugin	4.0.0-alpha.8
@typescript-eslint/parser	4.0.0-alpha.8
TypeScript	3.9.7
ESLint	7.6.0
node	14.6.0
npm	6.14.7

Debug details from flagged run

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  eslint:ignore-pattern   processed: { basePath: '/home/sean/Downloads/eslint', patterns: [ '/**/node_modules/*' ] } +0ms
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  eslint:rules Loading rule 'template-tag-spacing' (remaining=9) +0ms
  eslint:rules Loading rule 'unicode-bom' (remaining=8) +1ms
  eslint:rules Loading rule 'use-isnan' (remaining=7) +0ms
  eslint:rules Loading rule 'valid-jsdoc' (remaining=6) +0ms
  eslint:rules Loading rule 'valid-typeof' (remaining=5) +3ms
  eslint:rules Loading rule 'vars-on-top' (remaining=4) +1ms
  eslint:rules Loading rule 'wrap-iife' (remaining=3) +0ms
  eslint:rules Loading rule 'wrap-regex' (remaining=2) +1ms
  eslint:rules Loading rule 'yield-star-spacing' (remaining=1) +0ms
  eslint:rules Loading rule 'yoda' (remaining=0) +1ms
  eslint:config-array-factory Plugin /home/sean/Downloads/eslint/node_modules/eslint-plugin-unused-imports/lib/index.js loaded in: 341ms +341ms
  eslint:cascading-config-array-factory Stop traversing because of 'root:true'. +881ms
  eslint:cascading-config-array-factory Configuration was determined: ConfigArray(2) [ { type: 'config', name: 'DefaultIgnorePattern', filePath: '', criteria: null, env: undefined, globals: undefined, ignorePattern: IgnorePattern { patterns: [Array], basePath: '/home/sean/Downloads/eslint', loose: false }, noInlineConfig: undefined, parser: undefined, parserOptions: undefined, plugins: undefined, processor: undefined, reportUnusedDisableDirectives: undefined, root: undefined, rules: undefined, settings: undefined }, { type: 'config', name: '.eslintrc', filePath: '/home/sean/Downloads/eslint/.eslintrc', criteria: null, env: { node: true, browser: true }, globals: undefined, ignorePattern: undefined, noInlineConfig: undefined, parser: { error: null, filePath: '/home/sean/Downloads/eslint/node_modules/@typescript-eslint/parser/dist/index.js', id: '@typescript-eslint/parser', importerName: '.eslintrc', importerPath: '/home/sean/Downloads/eslint/.eslintrc' }, parserOptions: { ecmaVersion: 6, sourceType: 'module', ecmaFeatures: {} }, plugins: { '@typescript-eslint': [Object], 'unused-imports': [Object] }, processor: undefined, reportUnusedDisableDirectives: undefined, root: true, rules: { 'unused-imports/no-unused-vars': 'warn' }, settings: undefined } ] on /home/sean/Downloads/eslint +5ms
  eslint:ignore-pattern Create with: [ IgnorePattern { patterns: [ '/**/node_modules/*' ], basePath: '/home/sean/Downloads/eslint', loose: false } ] +890ms
  eslint:ignore-pattern   processed: { basePath: '/home/sean/Downloads/eslint', patterns: [ '/**/node_modules/*' ] } +1ms
  eslint:ignore-pattern Check {
  filePath: '/home/sean/Downloads/eslint/test.ts',
  dot: false,
  relativePath: 'test.ts',
  result: false
} +0ms
  eslint:cli-engine Lint /home/sean/Downloads/eslint/test.ts +0ms
  eslint:linter Linting code for /home/sean/Downloads/eslint/test.ts (pass 1) +0ms
  eslint:linter Verify +0ms
  eslint:linter With ConfigArray: /home/sean/Downloads/eslint/test.ts +0ms
  eslint:linter An error occurred while traversing +48ms
  eslint:linter Filename: /home/sean/Downloads/eslint/test.ts +0ms
  eslint:linter Line: 1 +0ms
  eslint:linter Parser Options: {
  ecmaFeatures: { globalReturn: false },
  ecmaVersion: 6,
  sourceType: 'module'
} +0ms
  eslint:linter Parser Path: /home/sean/Downloads/eslint/node_modules/@typescript-eslint/parser/dist/index.js +1ms
  eslint:linter Settings: {} +0ms

Oops! Something went wrong! :(

ESLint: 7.6.0

TypeError: Cannot read property 'loc' of undefined
Occurred while linting /home/sean/Downloads/eslint/test.ts:1
    at normalizeReportLoc (/home/sean/Downloads/eslint/node_modules/eslint-rule-composer/lib/rule-composer.js:47:26)
    at normalizeReport (/home/sean/Downloads/eslint/node_modules/eslint-rule-composer/lib/rule-composer.js:107:12)
    at Object.value [as report] (/home/sean/Downloads/eslint/node_modules/eslint-rule-composer/lib/rule-composer.js:143:72)
    at Program:exit (/home/sean/Downloads/eslint/node_modules/eslint-plugin-unused-imports/node_modules/eslint/lib/rules/no-unused-vars.js:596:33)
    at /home/sean/Downloads/eslint/node_modules/eslint/lib/linter/safe-emitter.js:45:58
    at Array.forEach (<anonymous>)
    at Object.emit (/home/sean/Downloads/eslint/node_modules/eslint/lib/linter/safe-emitter.js:45:38)
    at NodeEventGenerator.applySelector (/home/sean/Downloads/eslint/node_modules/eslint/lib/linter/node-event-generator.js:254:26)
    at NodeEventGenerator.applySelectors (/home/sean/Downloads/eslint/node_modules/eslint/lib/linter/node-event-generator.js:283:22)
    at NodeEventGenerator.leaveNode (/home/sean/Downloads/eslint/node_modules/eslint/lib/linter/node-event-generator.js:306:14)

[sweepline]

Thanks for this, hopefully it is not eslint-rule-composer that is causing this as it seems that the maintainer is not active anymore. I’ll take a closer look soon hopefully.

[mckennapsean]

Thanks for checking! Glad to see it is working again 😃

My company ended up going with this prettier plugin, since it sorts and removes unused imports automatically, which is more ideal for us. Thanks for your work here and the assist on this issue!