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@eslint-community/eslint-utils
Advanced tools
@eslint-community/eslint-utils is a utility library for working with ESLint. It provides a set of tools to help with creating, testing, and debugging ESLint rules and plugins.
getStaticValue
The `getStaticValue` function evaluates the static value of a given AST node. This is useful for determining the value of constants and literals in the code.
const { getStaticValue } = require('@eslint-community/eslint-utils');
const espree = require('espree');
const ast = espree.parse('const foo = 42;', { ecmaVersion: 2020 });
const node = ast.body[0].declarations[0].init;
const value = getStaticValue(node);
console.log(value); // { value: 42 }
ReferenceTracker
The `ReferenceTracker` class helps track references to global variables and properties. This is useful for identifying where and how certain variables or properties are used in the code.
const { ReferenceTracker } = require('@eslint-community/eslint-utils');
const espree = require('espree');
const eslintScope = require('eslint-scope');
const ast = espree.parse('const foo = { bar: 42 }; foo.bar;', { ecmaVersion: 2020 });
const scopeManager = eslintScope.analyze(ast);
const tracker = new ReferenceTracker(scopeManager);
for (const { node } of tracker.iterateGlobalReferences({ foo: { bar: true } })) {
console.log(node); // Node representing `foo.bar`
}
getFunctionHeadLocation
The `getFunctionHeadLocation` function returns the location of the function head, which includes the function keyword, name, and parameters. This is useful for reporting issues related to function definitions.
const { getFunctionHeadLocation } = require('@eslint-community/eslint-utils');
const espree = require('espree');
const ast = espree.parse('function foo() {}', { ecmaVersion: 2020 });
const node = ast.body[0];
const location = getFunctionHeadLocation(node, { sourceCode: { text: 'function foo() {}' } });
console.log(location); // { start: { line: 1, column: 0 }, end: { line: 1, column: 13 } }
ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. It is highly configurable and can be extended with custom rules and plugins. While @eslint-community/eslint-utils provides utilities for working with ESLint, ESLint itself is the core tool for linting JavaScript code.
eslint-plugin-import is a plugin that provides linting rules for validating proper imports. It helps ensure that import statements are valid and follow best practices. While @eslint-community/eslint-utils provides general utilities for ESLint, eslint-plugin-import focuses specifically on import/export syntax.
eslint-plugin-react is a plugin that provides linting rules for React applications. It helps enforce best practices and catch common issues in React code. While @eslint-community/eslint-utils provides general utilities for ESLint, eslint-plugin-react focuses specifically on React.
This package provides utility functions and classes for make ESLint custom rules.
For examples:
getStaticValue
evaluates static value on AST.ReferenceTracker
checks the members of modules/globals as handling assignments and destructuring.See documentation.
See releases.
Welcome contributing!
Please use GitHub's Issues/PRs.
npm test
runs tests and measures coverage.npm run clean
removes the coverage result of npm test
command.npm run coverage
shows the coverage result of the last npm test
command.npm run lint
runs ESLint.npm run watch
runs tests on each file change.FAQs
Utilities for ESLint plugins.
The npm package @eslint-community/eslint-utils receives a total of 16,228,110 weekly downloads. As such, @eslint-community/eslint-utils popularity was classified as popular.
We found that @eslint-community/eslint-utils demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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