problem with running eslint with npm node js

Question

eslint . --ext .js

Error: .eslintrc: Environment key "es2021" is unknown

at Object.keys.forEach.id (Image api/node_modules/eslint/lib/shared/config-validator.js:169:19)
at Array.forEach (<anonymous>)
at validateEnvironment (Image api/node_modules/eslint/lib/shared/config-validator.js:163:30)
at validateConfigArray (Image api/node_modules/eslint/lib/shared/config-validator.js:334:9)
at CascadingConfigArrayFactory._finalizeConfigArray (Image api/node_modules/eslint/lib/cli-engine/cascading-config-array-factory.js:417:13)
at CascadingConfigArrayFactory.getConfigArrayForFile (Image api/node_modules/eslint/lib/cli-engine/cascading-config-array-factory.js:271:21)
at FileEnumerator._iterateFilesRecursive (Image api/node_modules/eslint/lib/cli-engine/file-enumerator.js:396:49)
at _iterateFilesRecursive.next (<anonymous>)
at FileEnumerator.iterateFiles (Image api/node_modules/eslint/lib/cli-engine/file-enumerator.js:251:49)
at iterateFiles.next (<anonymous>)

npm ERR! code ELIFECYCLE npm ERR! errno 2 npm ERR! [email protected] lint: eslint . --ext .js npm ERR! Exit status 2 npm ERR! npm ERR! Failed at the [email protected] lint script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in: npm ERR! /home/marwan/.npm/_logs/2022-01-10T23_00_43_567Z-debug.log

.eslintrc

{ "env": { "browser": true, "es2021": true }, "parser": "@typescript-eslint/parser", "parserOptions": { "ecmaVersion": 12, "sourceType": "module" }, "plugins": [ "@typescript-eslint" ], "rules": { "indent": [ "error", 2 ], "linebreak-style": [ "error", "unix" ], "quotes": [ "error", "single" ], "semi": [ "error", "always" ], "no-multiple-empty-lines": [ 2, { "max": 1, "maxEOF": 0, "maxBOF": 0 } ], "no-trailing-spaces": "error", "import/no-extraneous-dependencies": 0 } }

Can you show us your .eslintrc.json config file please. Or alternatively whichever config file format you chose. config-validator.js is throwing an error implying there is an error in your configuration — Matt Davis
– Matt Davis, Commented Jan 10, 2022 at 23:33
Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. — Community
– Community Bot, Commented Jan 18, 2022 at 20:21
Maybe you need to ignore node_modules folder eslint . --ext .js --ignore-pattern node_modules/ — Knyazik01
– Knyazik01, Commented May 18, 2024 at 22:40

GOTO 0 · Accepted Answer · 2022-01-11 00:04:58Z

0

The environment es2021 was added with ESLint 8 (ESLint 7 does not have it). The error message is a hint that you are using an older version of ESLint.

Look into your package.json, update the ESLint version to >= 8, then run npm install.

answered Jan 11, 2022 at 0:04

GOTO 0

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2 Comments

marwan Ahmed Over a year ago

I'm using eslint 8.4.0

GOTO 0 Over a year ago

@marwanAhmed I doubt that. Looking at your stack trace, an error is thrown in config-validator.js on line 169 for the code Object.keys.forEach.id, but in ESLint 8.4.0 that code is on line 176: github.com/eslint/eslint/blob/v8.4.0/lib/shared/…

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