41 lines
763 B
TypeScript
41 lines
763 B
TypeScript
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export interface Disposable {
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dispose(): void
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}
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export interface Event<T> {
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(listener: (value: T) => void): Disposable
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}
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/**
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* Emitter typecasts for a single event type.
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*/
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export class Emitter<T> {
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private listeners: Array<(value: T) => void> = []
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public get event(): Event<T> {
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return (cb: (value: T) => void): Disposable => {
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this.listeners.push(cb)
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return {
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dispose: (): void => {
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const i = this.listeners.indexOf(cb)
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if (i !== -1) {
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this.listeners.splice(i, 1)
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}
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},
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}
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}
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}
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/**
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* Emit an event with a value.
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*/
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public emit(value: T): void {
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this.listeners.forEach((cb) => cb(value))
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}
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public dispose(): void {
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this.listeners = []
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}
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}
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