FetchEvent.waitUntil()

The waitUntil() method tells the host environment that work is ongoing until the promise settles, and it shouldn't terminate the application if it wants that work to complete.

The waitUntil() method must be initially called synchronously within the event callback, but after that it can be called multiple times, and will hold the process open until all the promises passed to it settle.

Syntax

waitUntil(promise)

Parameters

A Promise.

Return value

None undefined.