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@ -1,34 +1,38 @@ |
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/* eslint-disable array-callback-return */ |
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/** |
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/** |
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* copy to https://github.com/developit/mitt
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* copy to https://github.com/developit/mitt
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* Expand clear method |
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* Expand clear method |
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*/ |
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*/ |
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export type EventType = string | symbol |
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export type EventType = string | symbol |
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// An event handler can take an optional event argument
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// An event handler can take an optional event argument
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// and should not return a value
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// and should not return a value
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export type Handler<T = any> = (event?: T) => void |
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export type Handler<T = unknown> = (event: T) => void |
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export type WildcardHandler = (type: EventType, event?: any) => void |
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export type WildcardHandler<T = Record<string, unknown>> = ( |
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type: keyof T, |
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event: T[keyof T], |
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) => void |
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// An array of all currently registered event handlers for a type
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// An array of all currently registered event handlers for a type
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export type EventHandlerList = Array<Handler> |
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export type EventHandlerList<T = unknown> = Array<Handler<T>> |
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export type WildCardEventHandlerList = Array<WildcardHandler> |
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export type WildCardEventHandlerList<T = Record<string, unknown>> = Array<WildcardHandler<T>> |
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// A map of event types and their corresponding event handlers.
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// A map of event types and their corresponding event handlers.
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export type EventHandlerMap = Map<EventType, EventHandlerList | WildCardEventHandlerList> |
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export type EventHandlerMap<Events extends Record<EventType, unknown>> = Map< |
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keyof Events | '*', |
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EventHandlerList<Events[keyof Events]> | WildCardEventHandlerList<Events> |
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> |
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export interface Emitter { |
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export interface Emitter<Events extends Record<EventType, unknown>> { |
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all: EventHandlerMap |
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all: EventHandlerMap<Events> |
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on<T = any>(type: EventType, handler: Handler<T>): void |
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on<Key extends keyof Events>(type: Key, handler: Handler<Events[Key]>): void |
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on(type: '*', handler: WildcardHandler): void |
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on(type: '*', handler: WildcardHandler<Events>): void |
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off<T = any>(type: EventType, handler: Handler<T>): void |
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off<Key extends keyof Events>(type: Key, handler?: Handler<Events[Key]>): void |
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off(type: '*', handler: WildcardHandler): void |
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off(type: '*', handler: WildcardHandler<Events>): void |
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emit<T = any>(type: EventType, event?: T): void |
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emit<Key extends keyof Events>(type: Key, event: Events[Key]): void |
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emit(type: '*', event?: any): void |
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emit<Key extends keyof Events>(type: undefined extends Events[Key] ? Key : never): void |
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clear(): void |
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clear(): void |
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} |
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} |
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@ -37,7 +41,10 @@ export interface Emitter { |
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* @name mitt |
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* @name mitt |
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* @returns {Mitt} |
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* @returns {Mitt} |
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*/ |
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*/ |
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export default function mitt(all?: EventHandlerMap): Emitter { |
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export function mitt<Events extends Record<EventType, unknown>>( |
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all?: EventHandlerMap<Events>, |
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): Emitter<Events> { |
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type GenericEventHandler = Handler<Events[keyof Events]> | WildcardHandler<Events> |
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all = all || new Map() |
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all = all || new Map() |
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return { |
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return { |
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@ -48,46 +55,61 @@ export default function mitt(all?: EventHandlerMap): Emitter { |
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/** |
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/** |
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* Register an event handler for the given type. |
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* Register an event handler for the given type. |
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* @param {string|symbol} type Type of event to listen for, or `"*"` for all events |
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* @param {string|symbol} type Type of event to listen for, or `'*'` for all events |
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* @param {Function} handler Function to call in response to given event |
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* @param {Function} handler Function to call in response to given event |
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* @memberOf mitt |
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* @memberOf mitt |
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*/ |
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*/ |
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on<T = any>(type: EventType, handler: Handler<T>) { |
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on<Key extends keyof Events>(type: Key, handler: GenericEventHandler) { |
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const handlers = all?.get(type) |
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const handlers: Array<GenericEventHandler> | undefined = all!.get(type) |
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const added = handlers && handlers.push(handler) |
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if (handlers) |
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if (!added) |
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handlers.push(handler) |
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all?.set(type, [handler]) |
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else |
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all!.set(type, [handler] as EventHandlerList<Events[keyof Events]>) |
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}, |
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}, |
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/** |
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/** |
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* Remove an event handler for the given type. |
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* Remove an event handler for the given type. |
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* @param {string|symbol} type Type of event to unregister `handler` from, or `"*"` |
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* If `handler` is omitted, all handlers of the given type are removed. |
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* @param {Function} handler Handler function to remove |
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* @param {string|symbol} type Type of event to unregister `handler` from (`'*'` to remove a wildcard handler) |
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* @param {Function} [handler] Handler function to remove |
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* @memberOf mitt |
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* @memberOf mitt |
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*/ |
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*/ |
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off<T = any>(type: EventType, handler: Handler<T>) { |
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off<Key extends keyof Events>(type: Key, handler?: GenericEventHandler) { |
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const handlers = all?.get(type) |
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const handlers: Array<GenericEventHandler> | undefined = all!.get(type) |
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if (handlers) |
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if (handlers) { |
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if (handler) |
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handlers.splice(handlers.indexOf(handler) >>> 0, 1) |
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handlers.splice(handlers.indexOf(handler) >>> 0, 1) |
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else |
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all!.set(type, []) |
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} |
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}, |
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}, |
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/** |
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/** |
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* Invoke all handlers for the given type. |
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* Invoke all handlers for the given type. |
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* If present, `"*"` handlers are invoked after type-matched handlers. |
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* If present, `'*'` handlers are invoked after type-matched handlers. |
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* |
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* |
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* Note: Manually firing "*" handlers is not supported. |
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* Note: Manually firing '*' handlers is not supported. |
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* |
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* |
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* @param {string|symbol} type The event type to invoke |
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* @param {string|symbol} type The event type to invoke |
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* @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler |
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* @param {Any} [evt] Any value (object is recommended and powerful), passed to each handler |
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* @memberOf mitt |
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* @memberOf mitt |
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*/ |
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*/ |
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emit<T = any>(type: EventType, evt: T) { |
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emit<Key extends keyof Events>(type: Key, evt?: Events[Key]) { |
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;((all?.get(type) || []) as EventHandlerList).slice().map((handler) => { |
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let handlers = all!.get(type) |
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handler(evt) |
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if (handlers) { |
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(handlers as EventHandlerList<Events[keyof Events]>).slice().forEach((handler) => { |
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handler(evt as Events[Key]) |
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}) |
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}) |
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;((all?.get('*') || [])).slice().map((handler) => { |
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} |
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handler(type, evt) |
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handlers = all!.get('*') |
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if (handlers) { |
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(handlers as WildCardEventHandlerList<Events>).slice().forEach((handler) => { |
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handler(type, evt as Events[Key]) |
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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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/** |
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xingyu
2 years ago