p-forever

Run promise-returning & async functions until you end it

Think of it like an async version of while (true) {}.

Install

$ npm install p-forever

Usage

Here we create some numbered fixtures. The createFixture() function returns a Promise.

import pForever from 'p-forever';

pForever(async index => {
    index++;

    if (index > 100) {
        return pForever.end;
    }

    await createFixture(index);

    return index;
}, 0);

or

import pForever from 'p-forever';

let index = 0;

pForever(async () => {
    index++;

    if (index > 100) {
        return pForever.end;
    }

    await createFixture(index);
});

API

pForever(fn, initialValue?)

Returns a Promise that is fulfilled when fn returns pForever.end, or rejects if any of the promises returned from fn rejects.

fn(previousValue)

Type: Function

Receives the previously returned value. If a Promise is returned, it's awaited before calling fn again.

initialValue

Initial value to pass to fn.

pForever.end

Symbol used to end the loop.

Related

• p-times - Run promise-returning & async functions a specific number of times concurrently
• p-whilst - Calls a function repeatedly while a condition returns true and then resolves the promise
• More…