promise-inflight

promise-inflight

One promise for multiple requests in flight to avoid async duplication

USAGE

const inflight = require('promise-inflight')

// some request that does some stuff
function req(key) {
  // key is any random string.  like a url or filename or whatever.
  return inflight(key, () => {
    // this is where you'd fetch the url or whatever
    return Promise.delay(100)
  })
}

// only assigns a single setTimeout
// when it dings, all thens get called with the same result.  (There's only
// one underlying promise.)
req('foo').then(…)
req('foo').then(…)
req('foo').then(…)
req('foo').then(…)

SEE ALSO

• inflight - For the callback based function on which this is based.

STILL NEEDS

Tests!

Similar packages

Other packages similar to promise-inflight

p-memoize

p-memoize is a package that memoizes the result of a promise-returning or async function. It can cache results based on the input arguments and offers more extensive configuration options for cache management compared to promise-inflight, which focuses solely on managing concurrent identical requests.

async-memoize

Similar to p-memoize, async-memoize provides memoization for asynchronous functions. It supports multiple strategies for cache eviction and can handle concurrent execution more flexibly than promise-inflight, which is specifically tailored for handling cases where identical promises should not be executed multiple times concurrently.