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eslint / eslint

Find and fix problems in your JavaScript code.
https://eslint.org
MIT License
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Parsing error: Unexpected token = (destructuring) #11317

Closed iamogbz closed 5 years ago

iamogbz commented 5 years ago

Tell us about your environment

What parser (default, Babel-ESLint, etc.) are you using? default

Please show your full configuration:

Configuration ```sh yarn run v1.7.0 $ /Users/Emmanuel/Sources/yvm/node_modules/.bin/eslint --print-config . ``` ```js { "globals": { "__dirname": false, "__filename": false, "Buffer": false, "clearImmediate": false, "clearInterval": false, "clearTimeout": false, "console": false, "exports": true, "global": false, "Intl": false, "module": false, "process": false, "queueMicrotask": false, "require": false, "setImmediate": false, "setInterval": false, "setTimeout": false, "TextDecoder": false, "TextEncoder": false, "URL": false, "URLSearchParams": false, "AbortController": false, "AbortSignal": false, "addEventListener": false, "alert": false, "AnalyserNode": false, "Animation": false, "AnimationEffectReadOnly": false, "AnimationEffectTiming": false, "AnimationEffectTimingReadOnly": false, "AnimationEvent": false, "AnimationPlaybackEvent": false, "AnimationTimeline": false, "applicationCache": false, "ApplicationCache": false, "ApplicationCacheErrorEvent": false, "atob": false, "Attr": 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"no-misleading-character-class": "off", "no-mixed-operators": 0, "no-mixed-requires": "off", "no-mixed-spaces-and-tabs": "off", "no-multi-assign": "off", "no-multi-spaces": "off", "no-multi-str": "off", "no-multiple-empty-lines": "off", "no-native-reassign": "off", "no-negated-condition": "off", "no-negated-in-lhs": "off", "no-nested-ternary": "error", "no-new": "off", "no-new-func": "off", "no-new-object": "off", "no-new-require": "off", "no-new-symbol": "error", "no-new-wrappers": "off", "no-obj-calls": "error", "no-octal": "error", "no-octal-escape": "off", "no-param-reassign": "off", "no-path-concat": "off", "no-plusplus": "off", "no-process-env": "off", "no-process-exit": "off", "no-proto": "off", "no-prototype-builtins": "off", "no-redeclare": "error", "no-regex-spaces": "error", "no-restricted-globals": "off", "no-restricted-imports": "off", "no-restricted-modules": "off", "no-restricted-properties": "off", "no-restricted-syntax": "off", "no-return-assign": "off", "no-return-await": "off", "no-script-url": "off", "no-self-assign": "error", "no-self-compare": "off", "no-sequences": "off", "no-shadow": "off", "no-shadow-restricted-names": "off", "no-spaced-func": "off", "no-sparse-arrays": "error", "no-sync": "off", "no-tabs": 0, "no-template-curly-in-string": "off", "no-ternary": "off", "no-this-before-super": "error", "no-throw-literal": "off", "no-trailing-spaces": "off", "no-undef": "error", "no-undef-init": "off", "no-undefined": "off", "no-underscore-dangle": "off", "no-unexpected-multiline": 0, "no-unmodified-loop-condition": "off", "no-unneeded-ternary": "off", "no-unreachable": "error", "no-unsafe-finally": "error", "no-unsafe-negation": "error", "no-unused-expressions": "off", "no-unused-labels": "error", "no-unused-vars": "error", "no-use-before-define": "off", "no-useless-call": "off", "no-useless-computed-key": "error", "no-useless-concat": "off", "no-useless-constructor": "off", "no-useless-escape": "error", "no-useless-rename": "off", "no-useless-return": "off", "no-var": "error", "no-void": "off", "no-warning-comments": "off", "no-whitespace-before-property": "off", "no-with": "off", "nonblock-statement-body-position": "off", "object-curly-newline": "off", "object-curly-spacing": "off", "object-property-newline": "off", "object-shorthand": "off", "one-var": "off", "one-var-declaration-per-line": "off", "operator-assignment": "off", "operator-linebreak": "off", "padded-blocks": "off", "padding-line-between-statements": "off", "prefer-arrow-callback": "off", "prefer-const": "error", "prefer-destructuring": "off", "prefer-numeric-literals": "off", "prefer-object-spread": "off", "prefer-promise-reject-errors": "off", "prefer-reflect": "off", "prefer-rest-params": "off", "prefer-spread": "off", "prefer-template": "error", "quote-props": "off", "quotes": 0, "radix": "off", "require-atomic-updates": "off", "require-await": "off", "require-jsdoc": "off", "require-unicode-regexp": "off", "require-yield": "error", "rest-spread-spacing": "off", "semi": "off", "semi-spacing": "off", "semi-style": "off", "sort-imports": "off", "sort-keys": "off", "sort-vars": "off", "space-before-blocks": "off", "space-before-function-paren": "off", "space-in-parens": "off", "space-infix-ops": "off", "space-unary-ops": "off", "spaced-comment": "off", "strict": "off", "switch-colon-spacing": "off", "symbol-description": "off", "template-curly-spacing": "off", "template-tag-spacing": "off", "unicode-bom": "off", "use-isnan": "error", "valid-jsdoc": "off", "valid-typeof": "error", "vars-on-top": "off", "wrap-iife": "off", "wrap-regex": "off", "yield-star-spacing": "off", "yoda": "off", "generator-star": "off", "no-arrow-condition": "off", "no-comma-dangle": "off", "no-reserved-keys": "off", "no-space-before-semi": "off", "no-wrap-func": "off", "space-after-function-name": "off", "space-after-keywords": "off", "space-before-function-parentheses": "off", "space-before-keywords": "off", "space-in-brackets": "off", "space-return-throw-case": "off", "space-unary-word-ops": "off", "prettier/prettier": [ "error", { "printWidth": 80, "tabWidth": 4, "semi": false, "trailingComma": "all", "singleQuote": true } ], "jest/no-alias-methods": "warn", "jest/no-disabled-tests": "warn", "jest/no-focused-tests": "error", "jest/no-identical-title": "error", "jest/no-jest-import": "error", "jest/no-jasmine-globals": "warn", "jest/no-test-prefixes": "error", "jest/valid-describe": "error", "jest/valid-expect": "error", "jest/valid-expect-in-promise": "error", "jest/prefer-to-be-null": "error", "jest/prefer-to-be-undefined": "error", "jest/prefer-to-have-length": "error" }, "parserOptions": { "ecmaFeatures": { "globalReturn": true }, "ecmaVersion": 9, "sourceType": "module" }, "extends": [ "eslint:recommended", "prettier", "plugin:jest/recommended", "@tophat", "@tophat/eslint-config/jest" ], "plugins": [ "prettier", "jest" ] } ``` ```sh Done in 9.27s. ```

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

async function run() {
    // ...
             log('Querying github release API to determine latest version')
             { downloadUrl, versionTag } = await getLatestYvmVersion()
    // ...
}
yarn eslint scripts/install.js

What did you expect to happen? Errors should be output and shown in VS Code.

What actually happened? Please include the actual, raw output from ESLint.

yarn run v1.7.0
$ /Users/Emmanuel/Sources/yvm/node_modules/.bin/eslint scripts/install.js

/Users/Emmanuel/Sources/yvm/scripts/install.js
  89:41  error  Parsing error: Unexpected token

  87 |         } else {
  88 |             log('Querying github release API to determine latest version')
> 89 |             { downloadUrl, versionTag } = await getLatestYvmVersion()
     |                                         ^
  90 |         }
  91 |         zipFile = ZIP_DOWNLOAD_PATH
  92 |         downloadFile(downloadUrl, zipFile)

✖ 1 problem (1 error, 0 warnings)

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

VS Code integration breaks: the first = is underlined with the message: [eslint] Parsing error: unexpected token = Linting is broken for entire file, no other errors are shown even though they exist.

Conversely this is accepted:

const { downloadUrl, versionTag } = await getLatestYvmVersion()

Are you willing to submit a pull request to fix this bug? Sure :)

platinumazure commented 5 years ago

I'm not super familiar with Typescript so I don't know if there are Typescript-specific concerns here. But in vanilla JS, you can't use an object destructuring in an assignment expression without parentheses. This is because there is a parsing ambiguity between whether the brace is opening an object pattern or a block. So JavaScript interpreters assume a block unless you wrap the expression in parentheses.

Similarly, when in a variable declaration, the const tells the interpreter that it's definitely a declaration and there's no way the brace could mean block, so the brace must mean an object pattern, unambiguously.

Again, I'm talking about JS, not TS, so hopefully a team member can correct me if TS handles this differently. But in JS, you just need to wrap the whole assignment expression in parentheses:

({ downloadUrl, versionTag } = await getLatestYvmVersion())
iamogbz commented 5 years ago

Oops my bad