memo-async-fn v0.1.0

memo-async-fn

combine async / promise calls and cache result in memory with LRU

import memoAsyncFn from 'memo-async-fn'

const getUserInfo = memoAsyncFn(
  async (userId) => {
    const { data } = await fetcher('http://xxx/', { userId })
    return data
  }
)


const user1 = await getUserInfo(12)   // send request
const user2 = await getUserInfo(12)   // merged to 1st request
const user3 = await getUserInfo(9)    // send request
const user4 = await getUserInfo(12)   // merged too

// after few seconds...

const user5 = await getUserInfo(12)   // get cached result

API

this package provides:

• memoAsyncFn(fn, opts) return an enhanced async function

  • opts: optional. see MemoOptions in <./src/memoAsyncFn.ts>

• combined(opts) class method decorator

  Note: every instance has its own LRU cache in memory. if you have many instances, consider using same cache and setting opts.cache and opts.genKey

  @example

  class MyTest {
    @combined()
    async fetchInfo(userId) {
      // some expensive requests
    }
  }
  
  const tester = new MyTest()
  // now tester.fetchInfo is enhanced by memoAsyncFn

  • opts: optional. see MemoOptions in <./src/memoAsyncFn.ts>