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17 lines
512 B
TypeScript
17 lines
512 B
TypeScript
type OptionalKeys<T extends object> = {
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[K in keyof T]: T extends Record<K, T[K]>
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? never
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: K
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}[keyof T]
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type RequiredKeys<T extends object> = Exclude<keyof T, OptionalKeys<T>>
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type MonoArgEmitter<T, Keys extends keyof T> = <K extends Keys>(evt: K, arg?: T[K]) => void
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type BiArgEmitter<T, Keys extends keyof T> = <K extends Keys>(evt: K, arg: T[K]) => void
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export type EventEmitter<T extends object> =
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MonoArgEmitter<T, OptionalKeys<T>> & BiArgEmitter<T, RequiredKeys<T>>
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type A = Required<{}>
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