[](https://travis-ci.org/sindresorhus/mimic-fn)
> Make a function mimic another one
Useful when you wrap a function in another function and like to preserve the original name and other properties.
## Install
```
$ npm install mimic-fn
```
## Usage
```js
const mimicFn = require('mimic-fn');
function foo() {}
foo.unicorn = '🦄';
function wrapper() {
return foo();
}
console.log(wrapper.name);
//=> 'wrapper'
mimicFn(wrapper, foo);
console.log(wrapper.name);
//=> 'foo'
console.log(wrapper.unicorn);
//=> '🦄'
console.log(String(wrapper));
//=> '/* Wrapped with wrapper() */\nfunction foo() {}'
```
## API
### mimicFn(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
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