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// Force coverage update
const noop = () => {};
/**
* Class-based emitter implementation for better V8 optimization.
* All instances share methods via prototype.
*/
class EmitterImpl<T = void> implements Emitter<T> {
/** Set of registered listeners */
private _listeners: Set<Listener<T>>;
/** Settled payload (if settled) */
private _settledPayload: T | undefined = undefined;
/** Whether the emitter has been settled */
private _isSettled = false;
constructor(initialListeners?: Listener<T>[]) {
this._listeners = new Set<Listener<T>>(initialListeners);
// Bind 'on' to preserve 'this' context when passed as callback
}
size = (): number => {
return this._listeners.size;
};
settled = (): boolean => {
return this._isSettled;
};
on = (listenersOrMap: any, mappedListeners?: any): VoidFunction => {
let newListeners: Listener<T>[];
if (mappedListeners === undefined) {
// Simple form: on(listeners)
newListeners = Array.isArray(listenersOrMap)
? listenersOrMap
: [listenersOrMap];
} else {
// Mapped form: on(map, listeners)
const map = listenersOrMap as (value: T) => { value: any } | undefined;
const sourceListeners: Listener<any>[] = Array.isArray(mappedListeners)
? mappedListeners
: [mappedListeners];
newListeners = [
(value: T) => {
const mappedValue = map(value);
if (mappedValue) {
for (let i = 0; i < sourceListeners.length; i++) {
sourceListeners[i]!(mappedValue.value);
}
}
},
];
}
// If settled, call listeners immediately and return no-op
if (this._isSettled) {
const payload = this._settledPayload as T;
for (let i = 0; i < newListeners.length; i++) {
newListeners[i]!(payload);
}
return noop;
}
const listeners = this._listeners;
for (let i = 0; i < newListeners.length; i++) {
listeners.add(newListeners[i]!);
}
return () => {
for (let i = 0; i < newListeners.length; i++) {
listeners.delete(newListeners[i]!);
}
};
};
emit = (payload: T): void => {
if (this._isSettled) return;
this._doEmit(payload, false, false);
};
emitLifo = (payload: T): void => {
if (this._isSettled) return;
this._doEmit(payload, false, true);
};
clear = (): void => {
this._listeners.clear();
};
emitAndClear = (payload: T): void => {
if (this._isSettled) return;
this._doEmit(payload, true, false);
};
emitAndClearLifo = (payload: T): void => {
if (this._isSettled) return;
this._doEmit(payload, true, true);
};
settle = (payload: T): void => {
if (this._isSettled) return;
this._settledPayload = payload;
this._isSettled = true;
this._doEmit(payload, true, false);
};
/**
* Internal emit implementation.
* Creates snapshot to handle modifications during iteration.
*/
private _doEmit = (payload: T, clear: boolean, lifo: boolean): void => {
const listeners = this._listeners;
const size = listeners.size;
if (size === 0) return;
// Create snapshot - necessary because Set.forEach includes items added during iteration
const copy = Array.from(listeners);
if (clear) {
listeners.clear();
}
// Use traditional for loop for maximum performance
if (lifo) {
for (let i = size - 1; i >= 0; i--) {
copy[i]!(payload);
}
} else {
for (let i = 0; i < size; i++) {
copy[i]!(payload);
}
}
};
}
/**
* Creates an event emitter for managing and notifying listeners.
*
* An emitter provides a simple pub/sub pattern for managing event listeners.
* It's used internally by signals and effects to manage subscriptions and notifications.
*
* Features:
* - Add listeners that will be notified when events are emitted
* - Emit events to all registered listeners
* - Remove listeners via unsubscribe functions
* - Clear all listeners at once
* - Safe to call unsubscribe multiple times (idempotent)
*
* @template T - The type of payload that will be emitted to listeners (defaults to void)
* @returns An emitter object with add, emit, and clear methods
*
* @example
* ```ts
* const eventEmitter = emitter<string>();
*
* // Subscribe to events
* const unsubscribe = eventEmitter.on((message) => {
* console.log('Received:', message);
* });
*
* // Emit an event
* eventEmitter.emit('Hello'); // Logs: "Received: Hello"
*
* // Unsubscribe
* unsubscribe();
*
* // Clear all listeners
* eventEmitter.clear();
* ```
*/
export function emitter<T = void>(
initialListeners?: Listener<T>[]
): Emitter<T> {
return new EmitterImpl<T>(initialListeners);
}
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