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fix mtt types #19445

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fix mtt types #19445

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29 changes: 24 additions & 5 deletions packages/next/next-server/lib/mitt.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,12 +14,31 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
// It's been edited for the needs of this script
// See the LICENSE at the top of the file

type Handler = (...evts: any[]) => void

type Handler<T extends any[] = any[]> = (...evts: T) => void
type UrlOnlyEvents =
| 'routeChangeStart'
| 'routeChangeComplete'
| 'beforeHistoryChange'
| 'hashChangeStart'
| 'hashChangeComplete'
type ErrorEvents = 'routeChangeError'
export type MittEmitter = {
on(type: string, handler: Handler): void
off(type: string, handler: Handler): void
emit(type: string, ...evts: any[]): void
on(type: UrlOnlyEvents, handler: Handler<[string]>): void
on(
type: ErrorEvents,
handler: Handler<[unknown & { cancelled?: boolean }, string]>
): void
off(type: UrlOnlyEvents, handler: Handler<[string]>): void
off(
type: ErrorEvents,
handler: Handler<[unknown & { cancelled?: boolean }, string]>
): void
emit(type: UrlOnlyEvents, url: string): void
emit(
type: ErrorEvents,
error: unknown & { cancelled?: boolean },
url: string
): void
}

export default function mitt(): MittEmitter {
Expand Down