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Filename : README.html
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<h1>ESLint Scope</h1>
<p>ESLint Scope is the <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">ECMAScript</a> scope analyzer used in ESLint. It is a fork of <a href="http://github.com/estools/escope">escope</a>.</p>
<h2>Install</h2>
<pre><code>npm i eslint-scope --save
</code></pre>
<h2>📖 Usage</h2>
<p>To use in an ESM file:</p>
<pre><code class="language-js">import * as eslintScope from 'eslint-scope';
</code></pre>
<p>To use in a CommonJS file:</p>
<pre><code class="language-js">const eslintScope = require('eslint-scope');
</code></pre>
<p>Example:</p>
<pre><code class="language-js">import * as eslintScope from 'eslint-scope';
import * as espree from 'espree';
import estraverse from 'estraverse';

const ast = espree.parse(code, { range: true });
const scopeManager = eslintScope.analyze(ast);

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

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

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

        // do stuff
    }
});
</code></pre>
<h2>Contributing</h2>
<p>Issues and pull requests will be triaged and responded to as quickly as possible. We operate under the <a href="http://eslint.org/docs/developer-guide/contributing">ESLint Contributor Guidelines</a>, so please be sure to read them before contributing. If you're not sure where to dig in, check out the <a href="https://github.com/eslint/eslint-scope/issues">issues</a>.</p>
<h2>Build Commands</h2>
<ul>
<li><code>npm test</code> - run all linting and tests</li>
<li><code>npm run lint</code> - run all linting</li>
</ul>
<h2>License</h2>
<p>ESLint Scope is licensed under a permissive BSD 2-clause license.</p>