imterah/element-portable
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Tidy some types

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This commit is contained in:
Michael Telatynski 2021-09-14 14:41:55 +01:00
parent 5048e41e8b
commit f59baf1efb
2 changed files with 11 additions and 3 deletions
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12
src/hooks/useEventEmitter.ts
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@ -20,7 +20,11 @@ import type { EventEmitter } from "events";
type Handler = (...args: any[]) => void;
// Hook to wrap event emitter on and removeListener in hook lifecycle
export const useEventEmitter = (emitter: EventEmitter, eventName: string | symbol, handler: Handler) => {
export const useEventEmitter = (
emitter: EventEmitter | undefined,
eventName: string | symbol,
handler: Handler,
) => {
// Create a ref that stores handler
const savedHandler = useRef(handler);
@ -51,7 +55,11 @@ export const useEventEmitter = (emitter: EventEmitter, eventName: string | symbo
type Mapper<T> = (...args: any[]) => T;
export const useEventEmitterState = <T>(emitter: EventEmitter, eventName: string | symbol, fn: Mapper<T>): T => {
export const useEventEmitterState = <T>(
emitter: EventEmitter | undefined,
eventName: string | symbol,
fn: Mapper<T>,
): T => {
const [value, setValue] = useState<T>(fn());
const handler = useCallback((...args: any[]) => {
setValue(fn(...args));