re-mem

Fork of mem with "staleWhileRevalidate" and "staleIfError"

Install

npm install -S @fabsrc/re-mem

Usage

import reMem from "@fabsrc/re-mem"

function getData(id) {
  return Promise.resolve(`Data: ${id}`)
}
const getDataMemoized = reMem(getData, {
  maxAge: 1000,
  staleWhileRevalidate: 10000,
  staleIfError: 20000
})

getDataMemoized(123)
  .then(console.log)
  .catch(console.error)

Options

cacheKey Function that returns a cache key based on arguments passed to a function. By default the first argument is used as cache key
cache Custom cache to store data in. (Default: new Map())
cachePromiseRejection Boolean flag wether to cache rejected Promises or not (Default: false)
maxAge Time in ms to return the cached promise (Default: Infinity)
staleWhileRevalidate Time in ms to return stale data while revalidating the data in the background. The time starts after maxAge runs out.
staleIfError Time in ms to return stale data if original promise rejects with an error.

Development

Testing

npm test