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[6a3a178] | 1 | # ESLint Scope
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| 2 |
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| 3 | 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).
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| 4 |
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| 5 | ## Usage
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| 6 |
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| 7 | Install:
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| 8 |
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| 9 | ```
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| 10 | npm i eslint-scope --save
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| 11 | ```
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| 12 |
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| 13 | Example:
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| 14 |
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| 15 | ```js
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| 16 | var eslintScope = require('eslint-scope');
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| 17 | var espree = require('espree');
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| 18 | var estraverse = require('estraverse');
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| 19 |
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| 20 | var ast = espree.parse(code);
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| 21 | var scopeManager = eslintScope.analyze(ast);
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| 22 |
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| 23 | var currentScope = scopeManager.acquire(ast); // global scope
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| 24 |
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| 25 | estraverse.traverse(ast, {
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| 26 | enter: function(node, parent) {
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| 27 | // do stuff
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| 28 |
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| 29 | if (/Function/.test(node.type)) {
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| 30 | currentScope = scopeManager.acquire(node); // get current function scope
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| 31 | }
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| 32 | },
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| 33 | leave: function(node, parent) {
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| 34 | if (/Function/.test(node.type)) {
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| 35 | currentScope = currentScope.upper; // set to parent scope
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| 36 | }
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| 37 |
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| 38 | // do stuff
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| 39 | }
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| 40 | });
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| 41 | ```
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| 42 |
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| 43 | ## Contributing
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| 44 |
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| 45 | 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/eslint-scope/issues).
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| 46 |
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| 47 | ## Build Commands
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| 48 |
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| 49 | * `npm test` - run all linting and tests
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| 50 | * `npm run lint` - run all linting
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| 51 |
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| 52 | ## License
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| 53 |
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| 54 | ESLint Scope is licensed under a permissive BSD 2-clause license.
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