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