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

[mckennapsean]

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

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  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: {} +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)