Innovenergy_trunk/frontend/node_modules/emittery/index.js

153 lines
3.4 KiB
JavaScript

'use strict';
const anyMap = new WeakMap();
const eventsMap = new WeakMap();
const resolvedPromise = Promise.resolve();
function assertEventName(eventName) {
if (typeof eventName !== 'string') {
throw new TypeError('eventName must be a string');
}
}
function assertListener(listener) {
if (typeof listener !== 'function') {
throw new TypeError('listener must be a function');
}
}
function getListeners(instance, eventName) {
const events = eventsMap.get(instance);
if (!events.has(eventName)) {
events.set(eventName, new Set());
}
return events.get(eventName);
}
class Emittery {
constructor() {
anyMap.set(this, new Set());
eventsMap.set(this, new Map());
}
on(eventName, listener) {
assertEventName(eventName);
assertListener(listener);
getListeners(this, eventName).add(listener);
return this.off.bind(this, eventName, listener);
}
off(eventName, listener) {
assertEventName(eventName);
assertListener(listener);
getListeners(this, eventName).delete(listener);
}
once(eventName) {
return new Promise(resolve => {
assertEventName(eventName);
const off = this.on(eventName, data => {
off();
resolve(data);
});
});
}
async emit(eventName, eventData) {
assertEventName(eventName);
const listeners = getListeners(this, eventName);
const anyListeners = anyMap.get(this);
const staticListeners = [...listeners];
const staticAnyListeners = [...anyListeners];
await resolvedPromise;
return Promise.all([
...staticListeners.map(async listener => {
if (listeners.has(listener)) {
return listener(eventData);
}
}),
...staticAnyListeners.map(async listener => {
if (anyListeners.has(listener)) {
return listener(eventName, eventData);
}
})
]);
}
async emitSerial(eventName, eventData) {
assertEventName(eventName);
const listeners = getListeners(this, eventName);
const anyListeners = anyMap.get(this);
const staticListeners = [...listeners];
const staticAnyListeners = [...anyListeners];
await resolvedPromise;
/* eslint-disable no-await-in-loop */
for (const listener of staticListeners) {
if (listeners.has(listener)) {
await listener(eventData);
}
}
for (const listener of staticAnyListeners) {
if (anyListeners.has(listener)) {
await listener(eventName, eventData);
}
}
/* eslint-enable no-await-in-loop */
}
onAny(listener) {
assertListener(listener);
anyMap.get(this).add(listener);
return this.offAny.bind(this, listener);
}
offAny(listener) {
assertListener(listener);
anyMap.get(this).delete(listener);
}
clearListeners(eventName) {
if (typeof eventName === 'string') {
getListeners(this, eventName).clear();
} else {
anyMap.get(this).clear();
for (const listeners of eventsMap.get(this).values()) {
listeners.clear();
}
}
}
listenerCount(eventName) {
if (typeof eventName === 'string') {
return anyMap.get(this).size + getListeners(this, eventName).size;
}
if (typeof eventName !== 'undefined') {
assertEventName(eventName);
}
let count = anyMap.get(this).size;
for (const value of eventsMap.get(this).values()) {
count += value.size;
}
return count;
}
}
// Subclass used to encourage TS users to type their events.
Emittery.Typed = class extends Emittery {};
Object.defineProperty(Emittery.Typed, 'Typed', {
enumerable: false,
value: undefined
});
module.exports = Emittery;