babel-eslint
Advanced tools
Package description
The babel-eslint npm package is a parser that allows you to lint all valid Babel code with the ESLint linter. It is designed to be used with ESLint and Babel, providing compatibility between the two and allowing developers to use ESLint on code that contains Babel-specific syntax.
Parsing Babel Code for ESLint
This feature allows developers to configure ESLint to use babel-eslint as the parser, enabling ESLint to understand and lint code that includes Babel-specific syntax that is not yet supported by ESLint's default parser.
module.exports = { parser: 'babel-eslint', rules: { /* ESLint rules */ } };Experimental Syntax Support
babel-eslint can parse experimental syntax such as class properties and async functions, which might not be supported by ESLint's default parser. This allows developers to use ESLint on projects that make use of the latest JavaScript features.
class MyClass { async myMethod() { /* ... */ } }Custom Babel Configuration
babel-eslint allows developers to specify a custom Babel configuration file, ensuring that the parser understands the code in the same way Babel does when it transpiles the code.
{ "parserOptions": { "babelOptions": { "configFile": "path/to/your/babel.config.js" } } }This package is a parser that allows ESLint to lint TypeScript code. It is similar to babel-eslint in that it extends ESLint's capabilities to understand syntax not natively supported by ESLint. However, it is specifically designed for TypeScript, whereas babel-eslint is focused on Babel-specific JavaScript syntax.
This package is an ESLint plugin that provides linting rules for Flow, a static type checker for JavaScript. Like babel-eslint, it extends ESLint's functionality to additional syntax features, but it is tailored for Flow type annotations rather than Babel's JavaScript transformations.
Prettier is an opinionated code formatter that supports many languages, including JavaScript. While it is not a linter like ESLint or a parser like babel-eslint, it is often used in conjunction with ESLint to enforce consistent code formatting. Prettier can parse and format code with Babel-specific syntax when used with the appropriate plugins.
Readme
babel-eslint allows you to lint ALL valid Babel code with the fantastic ESLint.
If there is an issue, first check if it can be reproduced with the regular parser or with the latest versions of
eslintandbabel-eslint!
For questions and support please visit the #linting babel slack channel (sign up here)!
Note that the
ecmaFeaturesconfig property may still be required for ESLint to work properly with features not in ECMAScript 5 by default. Examples areglobalReturnandmodules)
Flow:
Check out eslint-plugin-flow-vars: An
eslintplugin that makes flow type annotations global variables and marks declarations as used. Solves the problem of false positives withno-undefandno-unused-vars.
no-undef for global flow types: ReactElement, ReactClass #130
.eslintrc or define types and import them import type ReactElement from './types'no-unused-vars/no-undef with Flow declarations (declare module A {}) #132Modules/strict mode
no-unused-vars: [2, {vars: local}] #136Please check out eslint-plugin-react for React/JSX issues
no-unused-vars with jsxPlease check out eslint-plugin-babel for other issues such as (and more):
ESLint allows custom parsers. This is great but some of the syntax nodes that Babel supports aren't supported by ESLint. When using this plugin, ESLint is monkeypatched and your code is transformed into code that ESLint can understand. All location info such as line numbers, columns is also retained so you can track down errors with ease.
Basically babel-eslint exports an index.js that a linter can use.
It just needs to export a parse method that takes in a string of code and outputs an AST.
$ npm install eslint@1.x babel-eslint@5 --save-dev
$ npm install eslint@2.x babel-eslint@6 --save-dev
.eslintrc
{
"parser": "babel-eslint",
"rules": {
"strict": 0
}
}
Check out the ESLint docs for all possible rules.
sourceType can be set to 'module'(default) or 'script' if your code isn't using ECMAScript modules.
allowImportExportEverywhere can be set to true to allow import and export declarations to appear anywhere a statement is allowed if your build environment supports that. By default, import and export declarations can only appear at a program's top level.
.eslintrc
{
"parser": "babel-eslint",
"parserOptions": {
"sourceType": "module",
"allowImportExportEverywhere": false
}
}
$ eslint your-files-here
FAQs
Custom parser for ESLint
We found that babel-eslint demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 12 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
The Python Software Foundation has secured a 5-year sponsorship from Fastly that supports PSF's activities and events, most notably the security and reliability of the Python Package Index (PyPI).
Security News
LDAPjs, an LDAP Client and Server API for Node.js, was decommissioned after its maintainer received an abusive email from a user, raising concerns about this form of abuse as a potential attack vector.
Security News
CISA launched a new project called Vulnrichment to enrich CVEs with details that help prioritize patching and mitigation efforts, as the NVD backlog of unenriched CVEs awaiting analysis surpasses 10,000.