@ocap/util/esm/ready.js

utils shared across multiple forge js libs, works in both node.js and browser

import EventEmitter from 'events';
export class Ready extends EventEmitter {
    constructor() {
        super();
        this.ready = false;
        this.readyCallbacks = [];
        this.readyMarks = {};
    }
    markReady(mark) {
        if (this.ready) {
            return;
        }
        if (mark === undefined) {
            this.ready = true;
            this.readyCallbacks.forEach((x) => x());
            this.emit('ready');
        }
        else {
            // console.log('Ready.markReady', this.name, mark);
            this.readyMarks[mark] = true;
            this.ready = Object.values(this.readyMarks).every((x) => !!x);
            if (this.ready) {
                this.readyCallbacks.forEach((cb) => cb());
                this.emit('ready');
            }
        }
    }
    onReady(cb) {
        if (this.ready) {
            cb();
        }
        else {
            this.readyCallbacks.push(cb);
        }
    }
}