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eslint-scope

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eslint-scope

ECMAScript scope analyzer for ESLint


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Maintainers
3
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61,118,411
decreased by-8.26%

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Package description

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);

Other packages similar to eslint-scope

Readme

Source

ESLint Scope

ESLint Scope is the ECMAScript scope analyzer used in ESLint. It is a fork of escope.

Usage

Install:

npm i eslint-scope --save

Example:

var eslintScope = require('eslint-scope');
var espree = require('espree');
var estraverse = require('estraverse');

var ast = espree.parse(code);
var scopeManager = eslintScope.analyze(ast);

var currentScope = scopeManager.acquire(ast);   // global scope

estraverse.traverse(ast, {
    enter: function(node, parent) {
        // do stuff

        if (/Function/.test(node.type)) {
            currentScope = scopeManager.acquire(node);  // get current function scope
        }
    },
    leave: function(node, parent) {
        if (/Function/.test(node.type)) {
            currentScope = currentScope.upper;  // set to parent scope
        }

        // do stuff
    }
});

Contributing

Issues and pull requests will be triaged and responded to as quickly as possible. We operate under the ESLint Contributor Guidelines, so please be sure to read them before contributing. If you're not sure where to dig in, check out the issues.

Build Commands

  • npm test - run all linting and tests
  • npm run lint - run all linting

License

ESLint Scope is licensed under a permissive BSD 2-clause license.

FAQs

Last updated on 15 Mar 2019

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