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<img src="media/logo.svg" alt="mimic-fn" width="400"> |
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> Make a function mimic another one |
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Useful when you wrap a function in another function and like to preserve the original name and other properties. |
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## Install |
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``` |
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$ npm install mimic-fn |
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``` |
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## Usage |
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```js |
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import mimicFunction from 'mimic-fn'; |
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function foo() {} |
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foo.unicorn = 'π¦'; |
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function wrapper() { |
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return foo(); |
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} |
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console.log(wrapper.name); |
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//=> 'wrapper' |
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mimicFunction(wrapper, foo); |
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console.log(wrapper.name); |
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//=> 'foo' |
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console.log(wrapper.unicorn); |
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//=> 'π¦' |
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console.log(String(wrapper)); |
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//=> '/* Wrapped with wrapper() */\nfunction foo() {}' |
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``` |
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## API |
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### mimicFunction(to, from, options?) |
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Modifies the `to` function to mimic the `from` function. Returns the `to` function. |
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`name`, `displayName`, and any other properties of `from` are copied. The `length` property is not copied. Prototype, class, and inherited properties are copied. |
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`to.toString()` will return the same as `from.toString()` but prepended with a `Wrapped with to()` comment. |
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#### to |
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Type: `Function` |
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Mimicking function. |
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#### from |
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Type: `Function` |
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Function to mimic. |
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#### options |
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Type: `object` |
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##### ignoreNonConfigurable |
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Type: `boolean`\ |
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Default: `false` |
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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. |
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## Related |
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- [rename-fn](https://github.com/sindresorhus/rename-fn) - Rename a function |
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- [keep-func-props](https://github.com/ehmicky/keep-func-props) - Wrap a function without changing its name and other properties |
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--- |
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<div align="center"> |
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<b> |
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<a href="https://tidelift.com/subscription/pkg/npm-mimic-fn?utm_source=npm-mimic-fn&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a> |
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</b> |
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<br> |
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<sub> |
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Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies. |
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</sub> |
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</div> |
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