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[no-unused-vars] Exception hit with default parameter in v.4.0.0-alpha.5 #2369

Assignees
bradzacher
Labels
bugSomething isn't workingpackage: eslint-pluginIssues related to @typescript-eslint/eslint-plugin
Milestone
@mckennapsean

Description

@mckennapsean

Repro

{"rules": {"@typescript-eslint/no-unused-vars":"error"   }}
exportclassTest{constructor(@Optional()value:number[]=[]){console.log(value);}}functionOptional<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 functionOptional 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

packageversion
@typescript-eslint/eslint-plugin4.0.0-alpha.5
@typescript-eslint/parser4.0.0-alpha.5
TypeScript3.7.5
ESLint7.6.0
node12.13.0
npm6.12.0

Debug details from flagged run

  eslint:cli CLI args: [ '--ext', '.ts', 'folder/folder2/test.ts', '--debug' ] +0ms  eslint:cli Running on files +4ms  eslint:config-array-factory Loading .eslintignore file: /home/seanm/project/.eslintignore +0ms  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/*' ] } +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  eslint:file-enumerator Start to iterate files: [ 'folder/folder2/test.ts' ] +0ms  eslint:file-enumerator File: /home/seanm/project/folder/folder2/test.ts +0ms  eslint:cascading-config-array-factory Load config files for /home/seanm/project/folder/folder2. +0ms  eslint:cascading-config-array-factory No cache found: /home/seanm/project/folder/folder2. +0ms  eslint:config-array-factory Loading legacy config file: /home/seanm/project/folder/folder2/.eslintrc +4ms  eslint:config-array-factory Config file found: /home/seanm/project/folder/folder2/.eslintrc +11ms  eslint:config-array-factory Loading parser "@typescript-eslint/parser" from /home/seanm/project/folder/folder2/.eslintrc +0ms  eslint:config-array-factory Loaded: @typescript-eslint/parser@4.0.0-alpha.5+35295892 (/home/seanm/project/node_modules/@typescript-eslint/parser/dist/index.js) +0ms  eslint:config-array-factory Loading plugin "@typescript-eslint" from /home/seanm/project/folder/folder2/.eslintrc +156ms  eslint:config-array-factory Loaded: @typescript-eslint/eslint-plugin@4.0.0-alpha.5+35295892 (/home/seanm/project/node_modules/@typescript-eslint/eslint-plugin/dist/index.js) +1ms  eslint:config-array-factory Plugin /home/seanm/project/node_modules/@typescript-eslint/eslint-plugin/dist/index.js loaded in: 92ms +92ms  eslint:cascading-config-array-factory No cache found: /home/seanm/project/folder/folder2. +261ms  eslint:config-array-factory Config file not found on /home/seanm/project/folder/folder2 +0ms  eslint:cascading-config-array-factory No cache found: /home/seanm/project/folder. +0ms  eslint:config-array-factory Config file not found on /home/seanm/project/folder +0ms  eslint:cascading-config-array-factory No cache found: /home/seanm/project/app/webroot. +0ms  eslint:config-array-factory Config file not found on /home/seanm/project/app/webroot +1ms  eslint:cascading-config-array-factory No cache found: /home/seanm/project/app. +1ms  eslint:config-array-factory Config file not found on /home/seanm/project/app +0ms  eslint:cascading-config-array-factory No cache found: /home/seanm/project. +0ms  eslint:config-array-factory Loading legacy config file: /home/seanm/project/.eslintrc +0ms  eslint:config-array-factory Config file found: /home/seanm/project/.eslintrc +1ms  eslint:config-array-factory Loading parser "@typescript-eslint/parser" from /home/seanm/project/.eslintrc +0ms  eslint:config-array-factory Loaded: @typescript-eslint/parser@4.0.0-alpha.5+35295892 (/home/seanm/project/node_modules/@typescript-eslint/parser/dist/index.js) +0ms  eslint:config-array-factory Loading plugin "@typescript-eslint" from /home/seanm/project/.eslintrc +0ms  eslint:config-array-factory Loaded: @typescript-eslint/eslint-plugin@4.0.0-alpha.5+35295892 (/home/seanm/project/node_modules/@typescript-eslint/eslint-plugin/dist/index.js) +0ms  eslint:config-array-factory Plugin /home/seanm/project/node_modules/@typescript-eslint/eslint-plugin/dist/index.js loaded in: 0ms +0ms  eslint:config-array-factory Loading plugin "simple-import-sort" from /home/seanm/project/.eslintrc +0ms  eslint:config-array-factory Loaded: eslint-plugin-simple-import-sort@5.0.3 (/home/seanm/project/node_modules/eslint-plugin-simple-import-sort/index.js) +0ms  eslint:config-array-factory Plugin /home/seanm/project/node_modules/eslint-plugin-simple-import-sort/index.js loaded in: 1ms +1ms  eslint:config-array-factory Loading plugin "import" from /home/seanm/project/.eslintrc +0ms  eslint:config-array-factory Loaded: eslint-plugin-import@2.22.0 (/home/seanm/project/node_modules/eslint-plugin-import/lib/index.js) +0ms  eslint:config-array-factory Plugin /home/seanm/project/node_modules/eslint-plugin-import/lib/index.js loaded in: 34ms +34ms  eslint:config-array-factory Loading plugin "unused-imports" from /home/seanm/project/.eslintrc +0ms  eslint:config-array-factory Loaded: eslint-plugin-unused-imports@0.1.3 (/home/seanm/project/node_modules/eslint-plugin-unused-imports/lib/index.js) +1ms  eslint:rules Loading rule 'accessor-pairs' (remaining=274) +0ms  eslint:rules Loading rule 'array-bracket-newline' (remaining=273) +0ms  eslint:rules Loading rule 'array-bracket-spacing' (remaining=272) +1ms  eslint:rules Loading rule 'array-callback-return' (remaining=271) +0ms  eslint:rules Loading rule 'array-element-newline' (remaining=270) +0ms  eslint:rules Loading rule 'arrow-body-style' (remaining=269) +0ms  eslint:rules Loading rule 'arrow-parens' (remaining=268) +0ms  eslint:rules Loading rule 'arrow-spacing' (remaining=267) +1ms  eslint:rules Loading rule 'block-scoped-var' (remaining=266) +0ms  eslint:rules Loading rule 'block-spacing' (remaining=265) +0ms  eslint:rules Loading rule 'brace-style' (remaining=264) +0ms  eslint:rules Loading rule 'callback-return' (remaining=263) +0ms  eslint:rules Loading rule 'camelcase' (remaining=262) +0ms  eslint:rules Loading rule 'capitalized-comments' (remaining=261) +1ms  eslint:rules Loading rule 'class-methods-use-this' (remaining=260) +0ms  eslint:rules Loading rule 'comma-dangle' (remaining=259) +0ms  eslint:rules Loading rule 'comma-spacing' (remaining=258) +0ms  eslint:rules Loading rule 'comma-style' (remaining=257) +1ms  eslint:rules Loading rule 'complexity' (remaining=256) +0ms  eslint:rules Loading rule 'computed-property-spacing' (remaining=255) +0ms  eslint:rules Loading rule 'consistent-return' (remaining=254) +0ms  eslint:rules Loading rule 'consistent-this' (remaining=253) +0ms  eslint:rules Loading rule 'constructor-super' (remaining=252) +1ms  eslint:rules Loading rule 'curly' (remaining=251) +0ms  eslint:rules Loading rule 'default-case' (remaining=250) +0ms  eslint:rules Loading rule 'default-param-last' (remaining=249) +0ms  eslint:rules Loading rule 'dot-location' (remaining=248) +0ms  eslint:rules Loading rule 'dot-notation' (remaining=247) +1ms  eslint:rules Loading rule 'eol-last' (remaining=246) +0ms  eslint:rules Loading rule 'eqeqeq' (remaining=245) +0ms  eslint:rules Loading rule 'for-direction' (remaining=244) +0ms  eslint:rules Loading rule 'func-call-spacing' (remaining=243) +0ms  eslint:rules Loading rule 'func-name-matching' (remaining=242) 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'no-eq-null' (remaining=167) +1ms  eslint:rules Loading rule 'no-eval' (remaining=166) +0ms  eslint:rules Loading rule 'no-ex-assign' (remaining=165) +0ms  eslint:rules Loading rule 'no-extend-native' (remaining=164) +0ms  eslint:rules Loading rule 'no-extra-bind' (remaining=163) +0ms  eslint:rules Loading rule 'no-extra-boolean-cast' (remaining=162) +0ms  eslint:rules Loading rule 'no-extra-label' (remaining=161) +1ms  eslint:rules Loading rule 'no-extra-parens' (remaining=160) +0ms  eslint:rules Loading rule 'no-extra-semi' (remaining=159) +0ms  eslint:rules Loading rule 'no-fallthrough' (remaining=158) +0ms  eslint:rules Loading rule 'no-floating-decimal' (remaining=157) +0ms  eslint:rules Loading rule 'no-func-assign' (remaining=156) +0ms  eslint:rules Loading rule 'no-global-assign' (remaining=155) +0ms  eslint:rules Loading rule 'no-implicit-coercion' (remaining=154) +1ms  eslint:rules Loading rule 'no-implicit-globals' (remaining=153) +0ms  eslint:rules Loading rule 'no-implied-eval' (remaining=152) +0ms  eslint:rules Loading rule 'no-import-assign' (remaining=151) +0ms  eslint:rules Loading rule 'no-inline-comments' (remaining=150) +0ms  eslint:rules Loading rule 'no-inner-declarations' (remaining=149) +1ms  eslint:rules Loading rule 'no-invalid-regexp' (remaining=148) +0ms  eslint:rules Loading rule 'no-invalid-this' (remaining=147) +0ms  eslint:rules Loading rule 'no-irregular-whitespace' (remaining=146) +0ms  eslint:rules Loading rule 'no-iterator' (remaining=145) +0ms  eslint:rules Loading rule 'no-label-var' (remaining=144) +0ms  eslint:rules Loading rule 'no-labels' (remaining=143) +0ms  eslint:rules Loading rule 'no-lone-blocks' (remaining=142) +1ms  eslint:rules Loading rule 'no-lonely-if' (remaining=141) +0ms  eslint:rules Loading rule 'no-loop-func' (remaining=140) +0ms  eslint:rules Loading rule 'no-magic-numbers' (remaining=139) +0ms  eslint:rules Loading rule 'no-misleading-character-class' (remaining=138) +0ms  eslint:rules Loading 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'no-restricted-imports' (remaining=107) +0ms  eslint:rules Loading rule 'no-restricted-modules' (remaining=106) +1ms  eslint:rules Loading rule 'no-restricted-properties' (remaining=105) +0ms  eslint:rules Loading rule 'no-restricted-syntax' (remaining=104) +0ms  eslint:rules Loading rule 'no-return-assign' (remaining=103) +0ms  eslint:rules Loading rule 'no-return-await' (remaining=102) +0ms  eslint:rules Loading rule 'no-script-url' (remaining=101) +0ms  eslint:rules Loading rule 'no-self-assign' (remaining=100) +1ms  eslint:rules Loading rule 'no-self-compare' (remaining=99) +0ms  eslint:rules Loading rule 'no-sequences' (remaining=98) +0ms  eslint:rules Loading rule 'no-setter-return' (remaining=97) +0ms  eslint:rules Loading rule 'no-shadow' (remaining=96) +0ms  eslint:rules Loading rule 'no-shadow-restricted-names' (remaining=95) +0ms  eslint:rules Loading rule 'no-spaced-func' (remaining=94) +1ms  eslint:rules Loading rule 'no-sparse-arrays' (remaining=93) +0ms  eslint:rules 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'padding-line-between-statements' (remaining=48) +0ms  eslint:rules Loading rule 'prefer-arrow-callback' (remaining=47) +1ms  eslint:rules Loading rule 'prefer-const' (remaining=46) +0ms  eslint:rules Loading rule 'prefer-destructuring' (remaining=45) +0ms  eslint:rules Loading rule 'prefer-exponentiation-operator' (remaining=44) +0ms  eslint:rules Loading rule 'prefer-named-capture-group' (remaining=43) +1ms  eslint:rules Loading rule 'prefer-numeric-literals' (remaining=42) +0ms  eslint:rules Loading rule 'prefer-object-spread' (remaining=41) +0ms  eslint:rules Loading rule 'prefer-promise-reject-errors' (remaining=40) +0ms  eslint:rules Loading rule 'prefer-reflect' (remaining=39) +1ms  eslint:rules Loading rule 'prefer-regex-literals' (remaining=38) +0ms  eslint:rules Loading rule 'prefer-rest-params' (remaining=37) +0ms  eslint:rules Loading rule 'prefer-spread' (remaining=36) +0ms  eslint:rules Loading rule 'prefer-template' (remaining=35) +0ms  eslint:rules Loading rule 'quote-props' (remaining=34) +0ms  eslint:rules Loading rule 'quotes' (remaining=33) +1ms  eslint:rules Loading rule 'radix' (remaining=32) +0ms  eslint:rules Loading rule 'require-atomic-updates' (remaining=31) +0ms  eslint:rules Loading rule 'require-await' (remaining=30) +0ms  eslint:rules Loading rule 'require-jsdoc' (remaining=29) +0ms  eslint:rules Loading rule 'require-unicode-regexp' (remaining=28) +1ms  eslint:rules Loading rule 'require-yield' (remaining=27) +0ms  eslint:rules Loading rule 'rest-spread-spacing' (remaining=26) +0ms  eslint:rules Loading rule 'semi' (remaining=25) +0ms  eslint:rules Loading rule 'semi-spacing' (remaining=24) +0ms  eslint:rules Loading rule 'semi-style' (remaining=23) +0ms  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: {} +0msOops! Something went wrong! :(ESLint: 7.6.0TypeError: Cannot read property 'type' of undefinedOccurred 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)

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