84 lines
3.5 KiB
Markdown
84 lines
3.5 KiB
Markdown
# is-callable <sup>[![Version Badge][2]][1]</sup>
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[![github actions][actions-image]][actions-url]
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[![coverage][codecov-image]][codecov-url]
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[![dependency status][5]][6]
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[![dev dependency status][7]][8]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][11]][1]
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Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.
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## Supported engines
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Automatically tested in every minor version of node.
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Manually tested in:
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- Safari: v4 - v15 <sub>(4, 5, 5.1, 6.0.5, 6.2, 7.1, 8, 9.1.3, 10.1.2, 11.1.2, 12.1, 13.1.2, 14.1.2, 15.3, 15.6.1)</sub>
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- Note: Safari 9 has `class`, but `Function.prototype.toString` hides that progeny and makes them look like functions, so `class` constructors will be reported by this package as callable, when they are not in fact callable.
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- Chrome: v15 - v81, v83 - v106<sub>(every integer version)</sub>
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- Note: This includes Edge v80+ and Opera v15+, which matches Chrome
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- Firefox: v3, v3.6, v4 - v105 <sub>(every integer version)</sub>
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- Note: v45 - v54 has `class`, but `Function.prototype.toString` hides that progeny and makes them look like functions, so `class` constructors will be reported by this package as callable, when they are not in fact callable.
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- Note: in v42 - v63, `Function.prototype.toString` throws on HTML element constructors, or a Proxy to a function
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- Note: in v20 - v35, HTML element constructors are not callable, despite having typeof `function`.
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- Note: in v19, `document.all` is not callable.
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- IE: v6 - v11<sub>(every integer version</sub>
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- Opera: v11.1, v11.5, v11.6, v12.1, v12.14, v12.15, v12.16, v15+ <sub>v15+ matches Chrome</sub>
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## Example
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```js
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var isCallable = require('is-callable');
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var assert = require('assert');
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assert.notOk(isCallable(undefined));
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assert.notOk(isCallable(null));
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assert.notOk(isCallable(false));
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assert.notOk(isCallable(true));
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assert.notOk(isCallable([]));
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assert.notOk(isCallable({}));
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assert.notOk(isCallable(/a/g));
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assert.notOk(isCallable(new RegExp('a', 'g')));
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assert.notOk(isCallable(new Date()));
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assert.notOk(isCallable(42));
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assert.notOk(isCallable(NaN));
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assert.notOk(isCallable(Infinity));
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assert.notOk(isCallable(new Number(42)));
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assert.notOk(isCallable('foo'));
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assert.notOk(isCallable(Object('foo')));
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assert.ok(isCallable(function () {}));
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assert.ok(isCallable(function* () {}));
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assert.ok(isCallable(x => x * x));
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```
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## Install
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Install with
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```
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npm install is-callable
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```
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## Tests
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Simply clone the repo, `npm install`, and run `npm test`
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[1]: https://npmjs.org/package/is-callable
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[2]: https://versionbadg.es/inspect-js/is-callable.svg
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[5]: https://david-dm.org/inspect-js/is-callable.svg
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[6]: https://david-dm.org/inspect-js/is-callable
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[7]: https://david-dm.org/inspect-js/is-callable/dev-status.svg
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[8]: https://david-dm.org/inspect-js/is-callable#info=devDependencies
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[11]: https://nodei.co/npm/is-callable.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/is-callable.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/is-callable.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=is-callable
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[codecov-image]: https://codecov.io/gh/inspect-js/is-callable/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/inspect-js/is-callable/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-callable
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[actions-url]: https://github.com/inspect-js/is-callable/actions
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