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77 lines
2.0 KiB
Markdown
77 lines
2.0 KiB
Markdown
# universalify
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Make a callback- or promise-based function support both promises and callbacks.
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Uses the native promise implementation.
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## Installation
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```bash
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npm install universalify
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```
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## API
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### `universalify.fromCallback(fn)`
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Takes a callback-based function to universalify, and returns the universalified function.
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Function must take a callback as the last parameter that will be called with the signature `(error, result)`. `universalify` does not support calling the callback with three or more arguments, and does not ensure that the callback is only called once.
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```js
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function callbackFn (n, cb) {
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setTimeout(() => cb(null, n), 15)
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}
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const fn = universalify.fromCallback(callbackFn)
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// Works with Promises:
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fn('Hello World!')
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.then(result => console.log(result)) // -> Hello World!
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.catch(error => console.error(error))
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// Works with Callbacks:
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fn('Hi!', (error, result) => {
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if (error) return console.error(error)
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console.log(result)
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// -> Hi!
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})
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```
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### `universalify.fromPromise(fn)`
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Takes a promise-based function to universalify, and returns the universalified function.
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Function must return a valid JS promise. `universalify` does not ensure that a valid promise is returned.
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```js
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function promiseFn (n) {
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return new Promise(resolve => {
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setTimeout(() => resolve(n), 15)
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})
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}
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const fn = universalify.fromPromise(promiseFn)
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// Works with Promises:
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fn('Hello World!')
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.then(result => console.log(result)) // -> Hello World!
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.catch(error => console.error(error))
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// Works with Callbacks:
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fn('Hi!', (error, result) => {
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if (error) return console.error(error)
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console.log(result)
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// -> Hi!
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})
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```
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## License
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MIT
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