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eslint-scope

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eslint-scope

ECMAScript scope analyzer for ESLint

8.3.0
latest
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npm
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89M
4.76%
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What is eslint-scope?

The eslint-scope npm package is used to analyze the scope of variables within JavaScript code. It is part of the ESLint family of tools and is used to determine where variables are declared and how they are used throughout the code. This can be particularly useful for identifying issues with variable shadowing, undeclared variables, or potential scope leaks.

What are eslint-scope's main functionalities?

Analyzing variable scope in a JavaScript file

This code sample demonstrates how to use eslint-scope to analyze the scope of variables in a JavaScript file. It reads the file, parses it into an AST (Abstract Syntax Tree) using espree, and then analyzes the scope with eslint-scope. The resulting globalScope object contains information about the variables and references in the global scope of the file.

const eslintScope = require('eslint-scope');
const espree = require('espree');
const fs = require('fs');

const code = fs.readFileSync('myfile.js', 'utf8');
const ast = espree.parse(code, { ecmaVersion: 6 });
const scopeManager = eslintScope.analyze(ast);

const globalScope = scopeManager.globalScope;
// Inspect the variables and references in the global scope
console.log(globalScope.variables);
console.log(globalScope.references);

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Package last updated on 07 Mar 2025

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