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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
type EventMap<WorkerEventMap> = {
type: keyof WorkerEventMap;
listener: (ev: WorkerEventMap[keyof WorkerEventMap]) => unknown;
};
export class EventEmitter<WorkerEventMap> {
listeners: EventMap<WorkerEventMap>[] = [];
trigger<K extends keyof WorkerEventMap>(type: K, ev: WorkerEventMap[K]) {
this.listeners
.filter(listener => type === listener.type)
.forEach(({listener}) => {
setTimeout(() => listener(ev), 0);
});
}
addEventListener<K extends keyof WorkerEventMap>(
type: K,
listener: (ev: WorkerEventMap[K]) => unknown,
): void {
// @ts-expect-error Incorrect typing. Not sure how to correctly type it
this.listeners.push({type, listener});
}
removeEventListener<K extends keyof WorkerEventMap>(
type: K,
listener: (ev: WorkerEventMap[K]) => unknown,
): void {
this.listeners = this.listeners.filter(
existingListener =>
!(
existingListener.type === type &&
existingListener.listener === listener
),
);
}
destroy() {
this.listeners.length = 0;
}
}
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