1.0.1 • Public • Published


    Official ESLint rules for Lightning Web Components (LWC).


    $ npm install eslint @babel/core @babel/eslint-parser @lwc/eslint-plugin-lwc --save-dev


    Add @lwc/eslint-plugin-lwc to the plugins section of your configuration. Then configure the desired rules in the rules sections. Some of the syntax used in Lightning Web Components is not yet stage 4 (eg. class fields or decorators), and the out-of-the-box parser from ESLint doesn't support this syntax yet. In order to parse the LWC files properly, set the parser field to @babel/eslint-parser.

    Example of .eslintrc:

        "parser": "@babel/eslint-parser",
        "parserOptions": {
            "requireConfigFile": false,
            "babelOptions": {
                "parserOpts": {
                    "plugins": ["classProperties", ["decorators", { "decoratorsBeforeExport": false }]]
        "plugins": ["@lwc/eslint-plugin-lwc"],
        "rules": {
            "@lwc/lwc/no-deprecated": "error",
            "@lwc/lwc/valid-api": "error",
            "@lwc/lwc/no-document-query": "error"

    For more details about configuration please refer to the dedicated section in the ESLint documentation: https://eslint.org/docs/user-guide/configuring


    To choose from three configuration settings, install the eslint-config-lwc sharable configuration package.



    Rule ID Description Fixable
    lwc/consistent-component-name ensure component class name matches file name 🔧
    lwc/no-api-reassignments prevent public property reassignments
    lwc/no-deprecated disallow usage of deprecated LWC APIs
    lwc/no-document-query disallow DOM query at the document level
    lwc/no-attributes-during-construction disallow setting attributes during construction
    lwc/no-leading-uppercase-api-name ensure public property doesn't start with an upper-case character
    lwc/no-unexpected-wire-adapter-usages enforce wire adapters to be used with wire decorator
    lwc/no-unknown-wire-adapters disallow usage of unknown wire adapters
    lwc/valid-api validate api decorator usage
    lwc/valid-track validate track decorator usage
    lwc/valid-wire validate wire decorator usage

    Best practices

    Rule ID Description Fixable
    lwc/no-async-operation restrict usage of async operations
    lwc/no-dupe-class-members disallow duplicate class members
    lwc/no-inner-html disallow usage of innerHTML
    lwc/no-leaky-event-listeners prevent event listeners from leaking memory
    lwc/prefer-custom-event suggest usage of CustomEvent over Event constructor

    Compat performance

    Older browsers like IE11 run LWC in compatibility mode. For more information about browser performance, please refer to Supported Browsers in the Lightning Web Components Developer Guide.

    Rule ID Description Fixable
    lwc/no-async-await disallow usage of the async-await syntax
    lwc/no-for-of disallow usage of the for-of syntax
    lwc/no-rest-parameter disallow usage of the rest parameter syntax


    npm i @lwc/eslint-plugin-lwc

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