mirror of https://github.com/jkjoy/sunpeiwen.git
96 lines
2.2 KiB
Markdown
96 lines
2.2 KiB
Markdown
<img src="media/logo.svg" alt="mimic-fn" width="400">
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<br>
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[](https://travis-ci.org/sindresorhus/mimic-fn)
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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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const mimicFn = require('mimic-fn');
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function foo() {}
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foo.unicorn = '🦄';
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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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mimicFn(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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//=> '🦄'
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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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### mimicFn(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`<br>
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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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