| <picture> | |
| <source media="(prefers-color-scheme: dark)" srcset="media/logo_dark.svg"> | |
| <img alt="mimic-function logo" src="media/logo.svg" width="400"> | |
| </picture> | |
| <br> | |
| > Make a function mimic another one | |
| Useful when you wrap a function in another function and you would like to preserve the original name and other properties. | |
| ## Install | |
| ```sh | |
| npm install mimic-function | |
| ``` | |
| ## Usage | |
| ```js | |
| import mimicFunction from 'mimic-function'; | |
| function foo() {} | |
| foo.unicorn = '🦄'; | |
| function wrapper() { | |
| return foo(); | |
| } | |
| console.log(wrapper.name); | |
| //=> 'wrapper' | |
| mimicFunction(wrapper, foo); | |
| console.log(wrapper.name); | |
| //=> 'foo' | |
| console.log(wrapper.unicorn); | |
| //=> '🦄' | |
| console.log(String(wrapper)); | |
| //=> '/* Wrapped with wrapper() */\nfunction foo() {}' | |
| ``` | |
| ## API | |
| ### mimicFunction(to, from, options?) | |
| Modifies the `to` function to mimic the `from` function. Returns the `to` function. | |
| `name`, `displayName`, and any other properties of `from` are copied. The `length` property is not copied. Prototype, class, and inherited properties are copied. | |
| `to.toString()` will return the same as `from.toString()` but prepended with a `Wrapped with to()` comment. | |
| #### to | |
| Type: `Function` | |
| Mimicking function. | |
| #### from | |
| Type: `Function` | |
| Function to mimic. | |
| #### options | |
| Type: `object` | |
| ##### ignoreNonConfigurable | |
| Type: `boolean`\ | |
| Default: `false` | |
| Skip modifying [non-configurable properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor#Description) instead of throwing an error. | |
| ## Related | |
| - [rename-fn](https://github.com/sindresorhus/rename-fn) - Rename a function | |
| - [keep-func-props](https://github.com/ehmicky/keep-func-props) - Wrap a function without changing its name and other properties |