tream/es/timer.js

Lightweight lazy streams in TypeScript

import { none, taken } from './stream';
var now = Date.now ? function () { return Date.now(); } :
    function () { return new Date().getTime(); };
export function interval(period) {
    var time = now();
    var pull_ = function (push) {
        var pre_ = time;
        time = now();
        var timer = setTimeout(function () {
            time = now();
            push(none, pull_);
        }, Math.max(0, period - (time - pre_)));
        return function () {
            clearTimeout(timer);
            time = pre_;
            return pull_;
        };
    };
    return pull_;
}
export function timeout(delay) {
    return taken(1, interval(delay));
}
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