shelving/util/start.js

Toolkit for using data in JavaScript.

import { call } from "./callback.js";
/**
 * Wrapper class to handle state on start/stop callback process.
 * - If process has already started, `starter.start()` won't be called twice (including if `start()` didn't return a `stop()` callback).
 */
export class Starter {
    _start;
    _stop = false;
    constructor(start) {
        this._start = start;
    }
    start(...values) {
        if (this._stop === false)
            this._stop = this._start(...values) || true;
    }
    stop() {
        if (this._stop !== false) {
            if (typeof this._stop === "function")
                call(this._stop);
            this._stop = false;
        }
    }
    [Symbol.dispose]() {
        this.stop();
    }
}
/** Get a `Starter` from a `PossibleStarter` */
export function getStarter(start) {
    return typeof start === "function" ? new Starter(start) : start;
}