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fix: unicode chars in native environments + event emitter refactor (#…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,31 +1,208 @@ | ||
| export class EventEmitter< | ||
| Events extends { [name: string]: (...args: any[]) => any } | ||
| > { | ||
| private readonly _events: { | ||
| [name in keyof Events]?: Array<Events[name]> | ||
| } = {} | ||
| type ListenerFunction = { | ||
| listener?: Function; | ||
| } & Function | ||
|
|
||
| on(event: keyof Events, listener: Events[typeof event]): () => void { | ||
| if (!this._hasEvent(event)) this._events[event] = [] | ||
| export class EventEmitter { | ||
| static defaultMaxListeners: number = 10; | ||
| maxListeners: number | undefined; | ||
| events: Map<string | symbol, Function[]>; | ||
|
|
||
| this._events[event].push(listener) | ||
| return () => this.removeListener(event, listener) | ||
| constructor() { | ||
| this.events = new Map(); | ||
| } | ||
|
|
||
| removeListener(event: keyof Events, listener: Events[typeof event]): void { | ||
| if (!this._hasEvent(event)) return | ||
| _addListener( | ||
| eventName: string | symbol, | ||
| listener: Function, | ||
| prepend: boolean | ||
| ): this { | ||
| this.emit("newListener", eventName, listener); | ||
| if (this.events.has(eventName)) { | ||
| const listeners = this.events.get(eventName) as Function[]; | ||
| if (prepend) { | ||
| listeners.unshift(listener); | ||
| } else { | ||
| listeners.push(listener); | ||
| } | ||
| } else { | ||
| this.events.set(eventName, [listener]); | ||
| } | ||
| const max = this.getMaxListeners(); | ||
| if (max > 0 && this.listenerCount(eventName) > max) { | ||
| const warning = new Error( | ||
| `Possible EventEmitter memory leak detected. | ||
| ${this.listenerCount(eventName)} ${eventName.toString()} listeners. | ||
| Use emitter.setMaxListeners() to increase limit` | ||
| ); | ||
| warning.name = "MaxListenersExceededWarning"; | ||
| console.warn(warning); | ||
| } | ||
|
|
||
| const index = this._events[event].indexOf(listener) | ||
| if (~index) this._events[event].splice(index, 1) | ||
| return this; | ||
| } | ||
|
|
||
| emit(event: keyof Events, ...args: Parameters<Events[typeof event]>): void { | ||
| if (!this._hasEvent(event)) return | ||
| addListener(eventName: string | symbol, listener: Function): this { | ||
| return this._addListener(eventName, listener, false); | ||
| } | ||
|
|
||
| emit(eventName: string | symbol, ...args: any[]): boolean { | ||
| if (this.events.has(eventName)) { | ||
| const listeners = (this.events.get(eventName) as Function[]).slice(); // We copy with slice() so array is not mutated during emit | ||
| for (const listener of listeners) { | ||
| try { | ||
| listener.apply(this, args); | ||
| } catch (err) { | ||
| this.emit("error", err); | ||
| } | ||
| } | ||
| return true; | ||
| } else if (eventName === "error") { | ||
| const errMsg = args.length > 0 ? args[0] : Error("Unhandled error."); | ||
| throw errMsg; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| eventNames(): [string | symbol] { | ||
| return Array.from(this.events.keys()) as [string | symbol]; | ||
| } | ||
|
|
||
| getMaxListeners(): number { | ||
| return this.maxListeners || EventEmitter.defaultMaxListeners; | ||
| } | ||
|
|
||
| listenerCount(eventName: string | symbol): number { | ||
| if (this.events.has(eventName)) { | ||
| return (this.events.get(eventName) as Function[]).length; | ||
| } else { | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| _listeners( | ||
| target: EventEmitter, | ||
| eventName: string | symbol, | ||
| unwrap: boolean | ||
| ): Function[] { | ||
| if (!target.events.has(eventName)) { | ||
| return []; | ||
| } | ||
|
|
||
| const eventListeners: ListenerFunction[] = target.events.get( | ||
| eventName | ||
| ) as Function[]; | ||
|
|
||
| return unwrap | ||
| ? this.unwrapListeners(eventListeners) | ||
| : eventListeners.slice(0); | ||
| } | ||
|
|
||
| unwrapListeners(arr: ListenerFunction[]): Function[] { | ||
| let unwrappedListeners: Function[] = new Array(arr.length) as Function[]; | ||
| for (let i = 0; i < arr.length; i++) { | ||
| unwrappedListeners[i] = arr[i]["listener"] || arr[i]; | ||
| } | ||
| return unwrappedListeners; | ||
| } | ||
|
|
||
| listeners(eventName: string | symbol): Function[] { | ||
| return this._listeners(this, eventName, true); | ||
| } | ||
|
|
||
| rawListeners(eventName: string | symbol): Function[] { | ||
| return this._listeners(this, eventName, false); | ||
| } | ||
|
|
||
| off(eventName: string | symbol, listener: Function): this { | ||
| return this.removeListener(eventName, listener); | ||
| } | ||
|
|
||
| on(eventName: string | symbol, listener: Function): this { | ||
| return this.addListener(eventName, listener); | ||
| } | ||
|
|
||
| once(eventName: string | symbol, listener: Function): this { | ||
| const wrapped: Function = this.onceWrap(eventName, listener); | ||
| this.on(eventName, wrapped); | ||
| return this; | ||
| } | ||
|
|
||
| // Wrapped function that calls EventEmitter.removeListener(eventName, self) on execution. | ||
| onceWrap(eventName: string | symbol, listener: Function): Function { | ||
| const wrapper: ListenerFunction = function ( | ||
| this: { | ||
| eventName: string | symbol; | ||
| listener: Function; | ||
| rawListener: Function; | ||
| context: EventEmitter; | ||
| }, | ||
| ...args: any[] // eslint-disable-line @typescript-eslint/no-explicit-any | ||
| ): void { | ||
| this.context.removeListener(this.eventName, this.rawListener); | ||
| this.listener.apply(this.context, args); | ||
| }; | ||
| const wrapperContext = { | ||
| eventName: eventName, | ||
| listener: listener, | ||
| rawListener: wrapper, | ||
| context: this | ||
| }; | ||
| const wrapped = wrapper.bind(wrapperContext); | ||
| wrapperContext.rawListener = wrapped; | ||
| wrapped.listener = listener; | ||
| return wrapped; | ||
| } | ||
|
|
||
| prependListener(eventName: string | symbol, listener: Function): this { | ||
| return this._addListener(eventName, listener, true); | ||
| } | ||
|
|
||
| prependOnceListener( | ||
| eventName: string | symbol, | ||
| listener: Function | ||
| ): this { | ||
| const wrapped: Function = this.onceWrap(eventName, listener); | ||
| this.prependListener(eventName, wrapped); | ||
| return this; | ||
| } | ||
|
|
||
| removeAllListeners(eventName?: string | symbol): this { | ||
| if (this.events === undefined) { | ||
| return this; | ||
| } | ||
|
|
||
| if (eventName && this.events.has(eventName)) { | ||
| const listeners = (this.events.get(eventName) as Function[]).slice(); // Create a copy; We use it AFTER it's deleted. | ||
| this.events.delete(eventName); | ||
| for (const listener of listeners) { | ||
| this.emit("removeListener", eventName, listener); | ||
| } | ||
| } else { | ||
| const eventList: [string | symbol] = this.eventNames(); | ||
| eventList.map((value: string | symbol) => { | ||
| this.removeAllListeners(value); | ||
| }); | ||
| } | ||
|
|
||
| return this; | ||
| } | ||
|
|
||
| this._events[event].map((listener) => listener.apply(this, args)) | ||
| removeListener(eventName: string | symbol, listener: Function): this { | ||
| if (this.events.has(eventName)) { | ||
| const arr: Function[] = this.events.get(eventName) as Function[]; | ||
| if (arr.indexOf(listener) !== -1) { | ||
| arr.splice(arr.indexOf(listener), 1); | ||
| this.emit("removeListener", eventName, listener); | ||
| if (arr.length === 0) { | ||
| this.events.delete(eventName); | ||
| } | ||
| } | ||
| } | ||
| return this; | ||
| } | ||
|
|
||
| private _hasEvent(event: keyof Events) { | ||
| return Array.isArray(this._events[event]) | ||
| setMaxListeners(n: number): this { | ||
| this.maxListeners = n; | ||
| return this; | ||
| } | ||
| } | ||
| } |
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