rvx/dist/es/async/watch-for.js

A signal based rendering library

import { captureSelf, teardown } from "../core/lifecycle.js";
import { watch } from "../core/signals.js";
export class WatchForTimeoutError extends Error {
}
export function watchFor(expr, condition, timeout) {
    if (typeof condition === "number") {
        timeout = condition;
        condition = Boolean;
    }
    else if (condition === undefined) {
        condition = Boolean;
    }
    return new Promise((resolve, reject) => {
        captureSelf(dispose => {
            watch(expr, value => {
                if (condition(value)) {
                    dispose();
                    resolve(value);
                }
            });
            if (timeout !== undefined) {
                const handle = setTimeout(() => {
                    dispose();
                    reject(new WatchForTimeoutError());
                }, timeout);
                teardown(() => clearTimeout(handle));
            }
        });
    });
}
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