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Immediate.prototype.ref - timers - Node documentation
method Immediate.prototype.ref

Usage in Deno

import { Immediate } from "node:timers";
Immediate.prototype.ref(): this

When called, requests that the Node.js event loop not exit so long as the Immediate is active. Calling immediate.ref() multiple times will have no effect.

By default, all Immediate objects are "ref'ed", making it normally unnecessary to call immediate.ref() unless immediate.unref() had been called previously.

Return Type

this

a reference to immediate