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GitHub - sindresorhus/p-tap: Tap into a promise chain without affecting its valu...
source link: https://github.com/sindresorhus/p-tap
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readme.md
p-tap 
Tap into a promise chain without affecting its value or state
Install
$ npm install p-tap
Usage
const pTap = require('p-tap'); Promise.resolve('unicorn') .then(pTap(console.log)) // Logs `unicorn` .then(value => { // `value` is still `unicorn` });
const pTap = require('p-tap'); getUser() .then(pTap(user => recordStatsAsync(user))) // Stats are saved about `user` async before the chain continues .then(user => { // `user` is the user from getUser(), not recordStatsAsync() });
const pTap = require('p-tap'); Promise.resolve(() => doSomething()) .catch(pTap.catch(console.error)) // prints any errors .then(handleSuccess) .catch(handleError);
API
pTap(input)
Use this in a .then() method.
Returns a thunk that returns a Promise.
pTap.catch(input)
Use this in a .catch() method.
Returns a thunk that returns a Promise.
input
Type: Function
Any return value is ignored. Exceptions thrown in input are relayed back to the original promise chain.
If input returns a Promise, it will be awaited before passing through the original value.
Related
- p-log - Log the value/error of a promise
- p-if - Conditional promise chains
- p-catch-if - Conditional promise catch handler
- More…
License
MIT © Sindre Sorhus
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