├── .editorconfig ├── .gitattributes ├── .github ├── funding.yml ├── security.md └── workflows │ └── main.yml ├── .gitignore ├── .npmrc ├── index.js ├── license ├── package.json ├── readme.md └── test.js /.editorconfig: -------------------------------------------------------------------------------- 1 | root = true 2 | 3 | [*] 4 | indent_style = tab 5 | end_of_line = lf 6 | charset = utf-8 7 | trim_trailing_whitespace = true 8 | insert_final_newline = true 9 | 10 | [*.yml] 11 | indent_style = space 12 | indent_size = 2 13 | -------------------------------------------------------------------------------- /.gitattributes: -------------------------------------------------------------------------------- 1 | * text=auto eol=lf 2 | -------------------------------------------------------------------------------- /.github/funding.yml: -------------------------------------------------------------------------------- 1 | github: sindresorhus 2 | tidelift: npm/fn-name 3 | -------------------------------------------------------------------------------- /.github/security.md: -------------------------------------------------------------------------------- 1 | # Security Policy 2 | 3 | To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure. 4 | -------------------------------------------------------------------------------- /.github/workflows/main.yml: -------------------------------------------------------------------------------- 1 | name: CI 2 | on: 3 | - push 4 | - pull_request 5 | jobs: 6 | test: 7 | name: Node.js ${{ matrix.node-version }} 8 | runs-on: ubuntu-latest 9 | strategy: 10 | fail-fast: false 11 | matrix: 12 | node-version: 13 | - 14 14 | - 12 15 | steps: 16 | - uses: actions/checkout@v2 17 | - uses: actions/setup-node@v1 18 | with: 19 | node-version: ${{ matrix.node-version }} 20 | - run: npm install 21 | - run: npm test 22 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | yarn.lock 3 | -------------------------------------------------------------------------------- /.npmrc: -------------------------------------------------------------------------------- 1 | package-lock=false 2 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | export default function functionName(function_) { 2 | if (typeof function_ !== 'function') { 3 | throw new TypeError('Expected a function'); 4 | } 5 | 6 | return function_.displayName || function_.name || (/function ([^(]+)?\(/.exec(function_.toString()) || [])[1]; 7 | } 8 | -------------------------------------------------------------------------------- /license: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) Sindre Sorhus (https://sindresorhus.com) 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 6 | 7 | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 8 | 9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 10 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "fn-name", 3 | "version": "4.0.0", 4 | "description": "Get the name of a named function", 5 | "license": "MIT", 6 | "repository": "sindresorhus/fn-name", 7 | "funding": "https://github.com/sponsors/sindresorhus", 8 | "author": { 9 | "name": "Sindre Sorhus", 10 | "email": "sindresorhus@gmail.com", 11 | "url": "https://sindresorhus.com" 12 | }, 13 | "type": "module", 14 | "exports": "./index.js", 15 | "engines": { 16 | "node": ">=12" 17 | }, 18 | "scripts": { 19 | "test": "xo && ava" 20 | }, 21 | "files": [ 22 | "index.js" 23 | ], 24 | "keywords": [ 25 | "function", 26 | "func", 27 | "fn", 28 | "name" 29 | ], 30 | "devDependencies": { 31 | "ava": "^3.15.0", 32 | "xo": "^0.38.2" 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /readme.md: -------------------------------------------------------------------------------- 1 | # fn-name 2 | 3 | > Get the name of a named function 4 | 5 | There is a [`name`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name) property on functions, but it's not supported in all browsers. This module tries that property then falls back to extracting the name from the function source. 6 | 7 | ## Install 8 | 9 | ``` 10 | $ npm install fn-name 11 | ``` 12 | 13 | ## Usage 14 | 15 | ```js 16 | import functionName from 'fn-name'; 17 | 18 | functionName(function foo() {}); 19 | //=> 'foo' 20 | ``` 21 | 22 | --- 23 | 24 |
25 | 26 | Get professional support for this package with a Tidelift subscription 27 | 28 |
29 | 30 | Tidelift helps make open source sustainable for maintainers while giving companies
assurances about security, maintenance, and licensing for their dependencies. 31 | 32 |
33 | -------------------------------------------------------------------------------- /test.js: -------------------------------------------------------------------------------- 1 | import test from 'ava'; 2 | import functionName from './index.js'; 3 | 4 | test('named', t => { 5 | t.is(functionName(function foo() {}), 'foo'); // eslint-disable-line func-names 6 | }); 7 | 8 | test('anonymous', t => { 9 | t.is(functionName(function() {}), undefined); // eslint-disable-line prefer-arrow-callback, space-before-function-paren 10 | t.is(functionName(function () {}), undefined); // eslint-disable-line prefer-arrow-callback 11 | }); 12 | 13 | test('arrow', t => { 14 | t.is(functionName(() => {}), undefined); 15 | }); 16 | 17 | test('nested', t => { 18 | t.is( 19 | functionName(function () { // eslint-disable-line prefer-arrow-callback 20 | function nested() {} 21 | nested(); 22 | }), 23 | undefined 24 | ); 25 | }); 26 | 27 | test('nested callback', t => { 28 | function call(fn) { 29 | fn(); 30 | } 31 | 32 | t.is( 33 | functionName(function () { // eslint-disable-line prefer-arrow-callback 34 | call(function callback() {}); // eslint-disable-line func-names 35 | }), 36 | undefined 37 | ); 38 | }); 39 | --------------------------------------------------------------------------------