node_modules/eslint-scope/README.md - devtools/devtools-frontend - Git at Google

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 # ESLint Scope

 ESLint Scope is the [ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm) scope analyzer used in ESLint. It is a fork of [escope](http://github.com/estools/escope).

 ## Install

 ```
 npm i eslint-scope --save
 ```

 ## 📖 Usage

 To use in an ESM file:

 ```js
 import * as eslintScope from 'eslint-scope';
 ```

 To use in a CommonJS file:

 ```js
 const eslintScope = require('eslint-scope');
 ```

 In order to analyze scope, you'll need to have an [ESTree](https://github.com/estree/estree) compliant AST structure to run it on. The primary method is `eslintScope.analyze()`, which takes two arguments:

 1. `ast` - the ESTree-compliant AST structure to analyze.
 2. `options` (optional) - Options to adjust how the scope is analyzed, including:
   * `ignoreEval` (default: `false`) - Set to `true` to ignore all `eval()` calls (which would normally create scopes).
   * `nodejsScope` (default: `false`) - Set to `true` to create a top-level function scope needed for CommonJS evaluation.
   * `impliedStrict` (default: `false`) - Set to `true` to evaluate the code in strict mode even outside of modules and without `"use strict"`.
   * `ecmaVersion` (default: `5`) - The version of ECMAScript to use to evaluate the code.
   * `sourceType` (default: `"script"`) - The type of JavaScript file to evaluate. Change to `"module"` for ECMAScript module code.
   * `childVisitorKeys` (default: `null`) - An object with visitor key information (like [`eslint-visitor-keys`](https://github.com/eslint/js/tree/main/packages/eslint-visitor-keys)). Without this, `eslint-scope` finds child nodes to visit algorithmically. Providing this option is a performance enhancement.
   * `fallback` (default: `"iteration"`) - The strategy to use when `childVisitorKeys` is not specified. May be a function.
   * `jsx` (default: `false`) - Enables the tracking of JSX components as variable references.

 Example:

 ```js
 import * as eslintScope from 'eslint-scope';
 import * as espree from 'espree';
 import estraverse from 'estraverse';

 const options = {
     ecmaVersion: 2022,
     sourceType: "module"
 };

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

 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
     }
 });
 ```

 ## Contributing

 Issues and pull requests will be triaged and responded to as quickly as possible. We operate under the [ESLint Contributor Guidelines](http://eslint.org/docs/developer-guide/contributing), so please be sure to read them before contributing. If you're not sure where to dig in, check out the [issues](https://github.com/eslint/js/issues).

 ## Security Policy

 We work hard to ensure that ESLint Scope is safe for everyone and that security issues are addressed quickly and responsibly. Read the full [security policy](https://github.com/eslint/.github/blob/master/SECURITY.md).

 ## 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.

 <!-- NOTE: This section is autogenerated. Do not manually edit.-->
 <!--sponsorsstart-->
 ## Sponsors

 The following companies, organizations, and individuals support ESLint's ongoing maintenance and development. [Become a Sponsor](https://eslint.org/donate)
 to get your logo on our READMEs and [website](https://eslint.org/sponsors).

 <h3>Platinum Sponsors</h3>
 <p><a href="https://automattic.com"><img src="https://images.opencollective.com/automattic/d0ef3e1/logo.png" alt="Automattic" height="128"></a> <a href="https://www.airbnb.com/"><img src="https://images.opencollective.com/airbnb/d327d66/logo.png" alt="Airbnb" height="128"></a></p><h3>Gold Sponsors</h3>
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 <h3>Technology Sponsors</h3>
 Technology sponsors allow us to use their products and services for free as part of a contribution to the open source ecosystem and our work.
 <p><a href="https://netlify.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/netlify-icon.svg" alt="Netlify" height="32"></a> <a href="https://algolia.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/algolia-icon.svg" alt="Algolia" height="32"></a> <a href="https://1password.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/1password-icon.svg" alt="1Password" height="32"></a></p>
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	[![npm version](https://img.shields.io/npm/v/eslint-scope.svg)](https://www.npmjs.com/package/eslint-scope)
	[![Downloads](https://img.shields.io/npm/dm/eslint-scope.svg)](https://www.npmjs.com/package/eslint-scope)
	[![Build Status](https://github.com/eslint/js/workflows/CI/badge.svg)](https://github.com/eslint/js/actions)

	# ESLint Scope

	ESLint Scope is the [ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm) scope analyzer used in ESLint. It is a fork of [escope](http://github.com/estools/escope).

	## Install

	```
	npm i eslint-scope --save
	```

	## 📖 Usage

	To use in an ESM file:

	```js
	import * as eslintScope from 'eslint-scope';
	```

	To use in a CommonJS file:

	```js
	const eslintScope = require('eslint-scope');
	```

	In order to analyze scope, you'll need to have an [ESTree](https://github.com/estree/estree) compliant AST structure to run it on. The primary method is `eslintScope.analyze()`, which takes two arguments:

	1. `ast` - the ESTree-compliant AST structure to analyze.
	2. `options` (optional) - Options to adjust how the scope is analyzed, including:
	* `ignoreEval` (default: `false`) - Set to `true` to ignore all `eval()` calls (which would normally create scopes).
	* `nodejsScope` (default: `false`) - Set to `true` to create a top-level function scope needed for CommonJS evaluation.
	* `impliedStrict` (default: `false`) - Set to `true` to evaluate the code in strict mode even outside of modules and without `"use strict"`.
	* `ecmaVersion` (default: `5`) - The version of ECMAScript to use to evaluate the code.
	* `sourceType` (default: `"script"`) - The type of JavaScript file to evaluate. Change to `"module"` for ECMAScript module code.
	* `childVisitorKeys` (default: `null`) - An object with visitor key information (like [`eslint-visitor-keys`](https://github.com/eslint/js/tree/main/packages/eslint-visitor-keys)). Without this, `eslint-scope` finds child nodes to visit algorithmically. Providing this option is a performance enhancement.
	* `fallback` (default: `"iteration"`) - The strategy to use when `childVisitorKeys` is not specified. May be a function.
	* `jsx` (default: `false`) - Enables the tracking of JSX components as variable references.

	Example:

	```js
	import * as eslintScope from 'eslint-scope';
	import * as espree from 'espree';
	import estraverse from 'estraverse';

	const options = {
	ecmaVersion: 2022,
	sourceType: "module"
	};

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

	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
	}
	});
	```

	## Contributing

	Issues and pull requests will be triaged and responded to as quickly as possible. We operate under the [ESLint Contributor Guidelines](http://eslint.org/docs/developer-guide/contributing), so please be sure to read them before contributing. If you're not sure where to dig in, check out the [issues](https://github.com/eslint/js/issues).

	## Security Policy

	We work hard to ensure that ESLint Scope is safe for everyone and that security issues are addressed quickly and responsibly. Read the full [security policy](https://github.com/eslint/.github/blob/master/SECURITY.md).

	## 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.

	<!-- NOTE: This section is autogenerated. Do not manually edit.-->
	<!--sponsorsstart-->
	## Sponsors

	The following companies, organizations, and individuals support ESLint's ongoing maintenance and development. [Become a Sponsor](https://eslint.org/donate)
	to get your logo on our READMEs and [website](https://eslint.org/sponsors).

	<h3>Platinum Sponsors</h3>
	<p><a href="https://automattic.com"><img src="https://images.opencollective.com/automattic/d0ef3e1/logo.png" alt="Automattic" height="128"></a> <a href="https://www.airbnb.com/"><img src="https://images.opencollective.com/airbnb/d327d66/logo.png" alt="Airbnb" height="128"></a></p><h3>Gold Sponsors</h3>
	<p><a href="https://qlty.sh/"><img src="https://images.opencollective.com/qltysh/33d157d/logo.png" alt="Qlty Software" height="96"></a> <a href="https://trunk.io/"><img src="https://images.opencollective.com/trunkio/fb92d60/avatar.png" alt="trunk.io" height="96"></a> <a href="https://shopify.engineering/"><img src="https://avatars.githubusercontent.com/u/8085" alt="Shopify" height="96"></a></p><h3>Silver Sponsors</h3>
	<p><a href="https://vite.dev/"><img src="https://images.opencollective.com/vite/e6d15e1/logo.png" alt="Vite" height="64"></a> <a href="https://www.jetbrains.com/"><img src="https://images.opencollective.com/jetbrains/fe76f99/logo.png" alt="JetBrains" height="64"></a> <a href="https://liftoff.io/"><img src="https://images.opencollective.com/liftoff/5c4fa84/logo.png" alt="Liftoff" height="64"></a> <a href="https://stackblitz.com"><img src="https://avatars.githubusercontent.com/u/28635252" alt="StackBlitz" height="64"></a></p><h3>Bronze Sponsors</h3>
	<p><a href="https://cybozu.co.jp/"><img src="https://images.opencollective.com/cybozu/933e46d/logo.png" alt="Cybozu" height="32"></a> <a href="https://www.crosswordsolver.org/anagram-solver/"><img src="https://images.opencollective.com/anagram-solver/2666271/logo.png" alt="Anagram Solver" height="32"></a> <a href="https://icons8.com/"><img src="https://images.opencollective.com/icons8/7fa1641/logo.png" alt="Icons8" height="32"></a> <a href="https://discord.com"><img src="https://images.opencollective.com/discordapp/f9645d9/logo.png" alt="Discord" height="32"></a> <a href="https://www.gitbook.com"><img src="https://avatars.githubusercontent.com/u/7111340" alt="GitBook" height="32"></a> <a href="https://nolebase.ayaka.io"><img src="https://avatars.githubusercontent.com/u/11081491" alt="Neko" height="32"></a> <a href="https://nx.dev"><img src="https://avatars.githubusercontent.com/u/23692104" alt="Nx" height="32"></a> <a href="https://opensource.mercedes-benz.com/"><img src="https://avatars.githubusercontent.com/u/34240465" alt="Mercedes-Benz Group" height="32"></a> <a href="https://herocoders.com"><img src="https://avatars.githubusercontent.com/u/37549774" alt="HeroCoders" height="32"></a> <a href="https://www.lambdatest.com"><img src="https://avatars.githubusercontent.com/u/171592363" alt="LambdaTest" height="32"></a></p>
	<h3>Technology Sponsors</h3>
	Technology sponsors allow us to use their products and services for free as part of a contribution to the open source ecosystem and our work.
	<p><a href="https://netlify.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/netlify-icon.svg" alt="Netlify" height="32"></a> <a href="https://algolia.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/algolia-icon.svg" alt="Algolia" height="32"></a> <a href="https://1password.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/1password-icon.svg" alt="1Password" height="32"></a></p>
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