[no-unused-vars] Exception hit with default parameter in v.4.0.0-alpha.5 #2369
Description
Repro
{
"rules": {
"@typescript-eslint/no-unused-vars": "error"
}
}export class Test {
constructor(@Optional() value: number[] = []) {
console.log(value);
}
}
function Optional<T>(): (targetClass: any, parameter: T, index: number) => void {
return (klass: any, parameter: T, index: number) => {
console.log(klass);
console.log(parameter);
console.log(index);
};
}Expected Result
No errors.
Actual Result
None - error is hit:
"Cannot read property 'type' of undefined Occurred while linting .../test.ts:1"
Additional Info
In previous versions of typescript-eslint, the function Optional is incorrectly reported as an unused var.
Removing the default parameter (= []) causes the rule to parse & the file to pass linting checks as expected (this was true in previous versions too).
Versions
| package | version |
|---|---|
@typescript-eslint/eslint-plugin |
4.0.0-alpha.5 |
@typescript-eslint/parser |
4.0.0-alpha.5 |
TypeScript |
3.7.5 |
ESLint |
7.6.0 |
node |
12.13.0 |
npm |
6.12.0 |
Debug details from flagged run
eslint:cli CLI args: [ '--ext', '.ts', 'folder/folder2/test.ts', '--debug' ] +0ms
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eslint:ignore-pattern processed: { basePath: '/home/seanm/project', patterns: [ '/**/node_modules/*' ] } +2ms
eslint:ignore-pattern Create with: [ IgnorePattern { patterns: [ '/**/node_modules/*' ], basePath: '/home/seanm/project', loose: false } ] +0ms
eslint:ignore-pattern processed: { basePath: '/home/seanm/project', patterns: [ '/**/node_modules/*' ] } +0ms
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eslint:rules Loading rule 'sort-imports' (remaining=22) +0ms
eslint:rules Loading rule 'sort-keys' (remaining=21) +1ms
eslint:rules Loading rule 'sort-vars' (remaining=20) +0ms
eslint:rules Loading rule 'space-before-blocks' (remaining=19) +0ms
eslint:rules Loading rule 'space-before-function-paren' (remaining=18) +0ms
eslint:rules Loading rule 'space-in-parens' (remaining=17) +1ms
eslint:rules Loading rule 'space-infix-ops' (remaining=16) +0ms
eslint:rules Loading rule 'space-unary-ops' (remaining=15) +0ms
eslint:rules Loading rule 'spaced-comment' (remaining=14) +0ms
eslint:rules Loading rule 'strict' (remaining=13) +0ms
eslint:rules Loading rule 'switch-colon-spacing' (remaining=12) +1ms
eslint:rules Loading rule 'symbol-description' (remaining=11) +0ms
eslint:rules Loading rule 'template-curly-spacing' (remaining=10) +0ms
eslint:rules Loading rule 'template-tag-spacing' (remaining=9) +0ms
eslint:rules Loading rule 'unicode-bom' (remaining=8) +0ms
eslint:rules Loading rule 'use-isnan' (remaining=7) +0ms
eslint:rules Loading rule 'valid-jsdoc' (remaining=6) +1ms
eslint:rules Loading rule 'valid-typeof' (remaining=5) +0ms
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) +0ms
eslint:rules Loading rule 'yield-star-spacing' (remaining=1) +0ms
eslint:rules Loading rule 'yoda' (remaining=0) +0ms
eslint:config-array-factory Plugin /home/seanm/project/node_modules/eslint-plugin-unused-imports/lib/index.js loaded in: 221ms +221ms
eslint:cascading-config-array-factory Stop traversing because of 'root:true'. +258ms
eslint:rules Loading rule 'no-var' (remaining=281) +0ms
eslint:rules Loading rule 'prefer-const' (remaining=280) +0ms
eslint:rules Loading rule 'curly' (remaining=279) +2ms
eslint:rules Loading rule 'sort-imports' (remaining=278) +5ms
eslint:cascading-config-array-factory Configuration was determined: ConfigArray [ { type: 'config', name: 'DefaultIgnorePattern', filePath: '', criteria: null, env: undefined, globals: undefined, ignorePattern: IgnorePattern { patterns: [Array], basePath: '/home/seanm/project', 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/seanm/project/.eslintrc', criteria: null, env: { node: true, browser: true }, globals: undefined, ignorePattern: undefined, noInlineConfig: undefined, parser: { error: null, filePath: '/home/seanm/project/node_modules/@typescript-eslint/parser/dist/index.js', id: '@typescript-eslint/parser', importerName: '.eslintrc', importerPath: '/home/seanm/project/.eslintrc' }, parserOptions: { ecmaVersion: 6, sourceType: 'module', ecmaFeatures: {} }, plugins: { '@typescript-eslint': [Object], 'simple-import-sort': [Object], import: [Object], 'unused-imports': [Object] }, processor: undefined, reportUnusedDisableDirectives: undefined, root: true, rules: { 'no-var': 'error', 'prefer-const': [Array], curly: 'warn', '@typescript-eslint/ban-types': [Array], '@typescript-eslint/explicit-member-accessibility': [Array], 'sort-imports': 'off', 'simple-import-sort/sort': 'warn', 'import/first': 'warn', 'import/newline-after-import': 'warn', 'import/no-duplicates': 'warn', '@typescript-eslint/no-unused-vars': 'error' }, settings: undefined }, { type: 'config', name: 'folder/folder2/.eslintrc', filePath: '/home/seanm/project/folder/folder2/.eslintrc', criteria: null, env: { node: true, browser: true }, globals: undefined, ignorePattern: undefined, noInlineConfig: undefined, parser: { error: null, filePath: '/home/seanm/project/node_modules/@typescript-eslint/parser/dist/index.js', id: '@typescript-eslint/parser', importerName: 'folder/folder2/.eslintrc', importerPath: '/home/seanm/project/folder/folder2/.eslintrc' }, parserOptions: { ecmaVersion: 6, sourceType: 'module', ecmaFeatures: {} }, plugins: { '@typescript-eslint': [Object] }, processor: undefined, reportUnusedDisableDirectives: undefined, root: undefined, rules: { '@typescript-eslint/no-unused-vars': 'error' }, settings: undefined }, { type: 'ignore', name: '.eslintignore', filePath: '/home/seanm/project/.eslintignore', criteria: null, env: undefined, globals: undefined, ignorePattern: IgnorePattern { patterns: [Array], basePath: '/home/seanm/project', loose: true }, noInlineConfig: undefined, parser: undefined, parserOptions: undefined, plugins: undefined, processor: undefined, reportUnusedDisableDirectives: undefined, root: undefined, rules: undefined, settings: undefined } ] on /home/seanm/project/folder/folder2 +11ms
eslint:ignore-pattern Create with: [ IgnorePattern { patterns: [ '/**/node_modules/*' ], basePath: '/home/seanm/project', loose: false }, IgnorePattern { patterns: [ '/bazel-*', 'node-modules', '**/js/app/externs/**/*.js', '**/js/plugins/**/*.js' ], basePath: '/home/seanm/project', loose: true } ] +533ms
eslint:ignore-pattern processed: { basePath: '/home/seanm/project', patterns: [ '/**/node_modules/*', '/bazel-*', 'node-modules', '**/js/app/externs/**/*.js', '**/js/plugins/**/*.js' ] } +0ms
eslint:ignore-pattern Check {
filePath: '/home/seanm/project/folder/folder2/test.ts',
dot: false,
relativePath: 'folder/folder2/test.ts',
result: false
} +1ms
eslint:cli-engine Lint /home/seanm/project/folder/folder2/test.ts +0ms
eslint:linter Linting code for /home/seanm/project/folder/folder2/test.ts (pass 1) +0ms
eslint:linter Verify +0ms
eslint:linter With ConfigArray: /home/seanm/project/folder/folder2/test.ts +0ms
eslint:linter An error occurred while traversing +28ms
eslint:linter Filename: /home/seanm/project/folder/folder2/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/seanm/project/node_modules/@typescript-eslint/parser/dist/index.js +0ms
eslint:linter Settings: {} +0ms
Oops! Something went wrong! :(
ESLint: 7.6.0
TypeError: Cannot read property 'type' of undefined
Occurred while linting /home/seanm/project/folder/folder2/test.ts:1
at isForInRef (/home/seanm/project/node_modules/eslint/lib/rules/no-unused-vars.js:449:24)
at /home/seanm/project/node_modules/eslint/lib/rules/no-unused-vars.js:486:21
at Array.some (<anonymous>)
at isUsedVariable (/home/seanm/project/node_modules/eslint/lib/rules/no-unused-vars.js:485:40)
at collectUnusedVariables (/home/seanm/project/node_modules/eslint/lib/rules/no-unused-vars.js:596:26)
at collectUnusedVariables (/home/seanm/project/node_modules/eslint/lib/rules/no-unused-vars.js:603:17)
at Program:exit (/home/seanm/project/node_modules/eslint/lib/rules/no-unused-vars.js:615:36)
at /home/seanm/project/node_modules/eslint/lib/linter/safe-emitter.js:45:58
at Array.forEach (<anonymous>)
at Object.emit (/home/seanm/project/node_modules/eslint/lib/linter/safe-emitter.js:45:38)