@textlint/kernel/module/src/task/promise-event-emitter.js

textlint kernel is core logic by pure JavaScript.

// MIT © 2017 azu
// MIT © 2017 59naga
// https://github.com/59naga/carrack
"use strict";
var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
    if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
    if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
    return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
};
var _EventEmitter_listeners;
export class EventEmitter {
    constructor() {
        _EventEmitter_listeners.set(this, new Map());
    }
    on(type, listener) {
        const prevSet = __classPrivateFieldGet(this, _EventEmitter_listeners, "f").get(type);
        const listenerSet = prevSet !== null && prevSet !== void 0 ? prevSet : new Set();
        listenerSet === null || listenerSet === void 0 ? void 0 : listenerSet.add(listener);
        __classPrivateFieldGet(this, _EventEmitter_listeners, "f").set(type, listenerSet);
    }
    emit(type, ...args) {
        const listenerSet = __classPrivateFieldGet(this, _EventEmitter_listeners, "f").get(type);
        if (!listenerSet) {
            return;
        }
        for (const listenerSetElement of listenerSet) {
            listenerSetElement(...args);
        }
    }
    off(type, listener) {
        const listenerSet = __classPrivateFieldGet(this, _EventEmitter_listeners, "f").get(type);
        if (!listenerSet) {
            return;
        }
        for (const listenerSetElement of listenerSet) {
            if (listenerSetElement === listener) {
                listenerSet.delete(listener);
            }
        }
    }
    removeAllListeners() {
        __classPrivateFieldGet(this, _EventEmitter_listeners, "f").clear();
    }
    listenerCount(type) {
        var _a, _b;
        return (_b = (_a = __classPrivateFieldGet(this, _EventEmitter_listeners, "f").get(type)) === null || _a === void 0 ? void 0 : _a.size) !== null && _b !== void 0 ? _b : 0;
    }
    listeners(type) {
        var _a;
        return Array.from((_a = __classPrivateFieldGet(this, _EventEmitter_listeners, "f").get(type)) !== null && _a !== void 0 ? _a : []);
    }
}
_EventEmitter_listeners = new WeakMap();
export class PromiseEventEmitter {
    constructor() {
        this.events = new EventEmitter();
    }
    listenerCount(type) {
        return this.events.listenerCount(type);
    }
    on(event, listener) {
        return this.events.on(event, listener);
    }
    emit(event, ...args) {
        const promises = [];
        this.events.listeners(event).forEach((listener) => {
            promises.push(listener(...args));
        });
        return Promise.all(promises);
    }
}
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