prex-es5/out/lib/delay.js

Async coordination primitives and extensions on top of ES6 Promises

/*! *****************************************************************************
Copyright (c) Microsoft Corporation.
Licensed under the Apache License, Version 2.0.

See LICENSE file in the project root for details.
***************************************************************************** */
import { CancellationToken } from "./cancellation";
/**
 * Waits the specified number of milliseconds before resolving with the provided value.
 *
 * @param token A CancellationToken
 * @param msec The number of milliseconds to wait before resolving.
 * @param value An optional value for the resulting Promise.
 */
export function delay(token_, msec_, value) {
    let token;
    let msec;
    if (typeof token_ === "number") {
        value = msec_;
        msec = token_;
        token = CancellationToken.none;
    }
    else {
        msec = msec_;
        token = token_;
    }
    if (!token.canBeCanceled) {
        return new Promise(resolve => setTimeout(resolve, msec, value));
    }
    return new Promise((resolve, reject) => {
        token.throwIfCancellationRequested();
        const handle = setTimeout(() => {
            registration.unregister();
            resolve(value);
        }, msec);
        const registration = token.register(() => {
            clearTimeout(handle);
            try {
                token.throwIfCancellationRequested();
            }
            catch (e) {
                reject(e);
            }
        });
    });
}

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