async-test-util/src/run-forever.js

Util-functions that are be useful in async tests

import wait from './wait';
import promisify from './promisify';

export default function runForever(predicate, interval = 100) {
    let t = 1; // trick optimizers
    return new Promise(() => {
        const runLoop = () => {
            t++;
            const val = promisify(predicate());
            val
                .then(() => wait(interval))
                .then(() => runLoop());
        };
        runLoop(t);
    });
}