stump-cycle-dom/lib/es6/uponStart.js

The standard DOM Driver for Cycle.js, based on Snabbdom

import { Stream } from 'xstream';
var UponStartOperator = /** @class */ (function () {
    function UponStartOperator(op, ins) {
        this.op = op;
        this.ins = ins;
        this.type = 'uponStart';
        this.out = null;
    }
    UponStartOperator.prototype._start = function (out) {
        this.op();
        this.out = out;
        this.ins._add(this);
    };
    UponStartOperator.prototype._stop = function () {
        this.ins._remove(this);
        this.out = null;
    };
    UponStartOperator.prototype._n = function (t) {
        this.out._n(t);
    };
    UponStartOperator.prototype._e = function (err) {
        this.out._e(err);
    };
    UponStartOperator.prototype._c = function () {
        this.out._c();
    };
    return UponStartOperator;
}());
/**
 * Delays periodic events by a given time period.
 *
 * Marble diagram:
 *
 * ```text
 * 1----2--3--4----5|
 *     delay(60)
 * ---1----2--3--4----5|
 * ```
 *
 * Example:
 *
 * ```js
 * import fromDiagram from 'xstream/extra/fromDiagram'
 * import uponStart from './uponStart'
 *
 * let is_complete = false
 * const stream = fromDiagram('1----2--3--4----5|')
 *  .compose(uponStart(() => {
 *    is_complete = true
 *  }))
 *
 * stream.addListener({
 *   next: i => console.log(i),
 *   error: err => console.error(err),
 *   complete: () => console.log('completed')
 * })
 * ```
 *
 * ```text
 * > 1  (after 60 ms)
 * > 2  (after 160 ms)
 * > 3  (after 220 ms)
 * > 4  (after 280 ms)
 * > 5  (after 380 ms)
 * > completed
 * ```
 *
 * @param {Function} op The amount of silence required in milliseconds.
 * @return {Stream}
 */
export default function uponStart(op) {
    return function uponStartOperator(ins) {
        return new Stream(new UponStartOperator(op, ins));
    };
}
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