memoizeConcurrent

memoize async functions such that concurrent calls return the same promise

Installation

1npm i --save memoize-concurrent

Usage

Supports both ESM and CommonJS

1// esm
2import memo from 'memoize-concurrent'
3// commonjs
4const memo = require('memoize-concurrent').default

Basic Example

Example showing that concurrent calls return the same promise and asyncronous calls invoke the passed function

1import memo from 'memoize-concurrent'
2
3const memoizedFetch = memo(fetch)
4
5const promise1 = memoizedFetch('http://localhost') // hits server
6const promise2 = memoizedFetch('http://localhost') // hits cache
7console.log(promise1 === promise2) // true
8await promise1
9const promise3 = memoizedFetch('http://localhost') // hits server
10console.log(promise1 === promise3) // false

Uses mem for Memoization

memoizeConcurrent uses mem under the hood and supports the same options

1import memo from 'memoize-concurrent'
2
3const memoizedFetch = memo(fetch, {
4  maxAge: 10, // maxAge of value in cache
5  cacheKey: (args) => args[0], // function to compute cache key
6  cache: new Map(), // provide your own cache
7})

License

MIT