type-plus/ts/object/KnownKeys.ts

Provides additional types for TypeScript.

// Original by Klaus Meinhardt @ajafff
// known from Gerrit Birkeland @Gerrit0
// https://github.com/Microsoft/TypeScript/issues/25987#issuecomment-408339599

import type { PrimitiveTypes } from '../primitive.js'

// https://github.com/microsoft/TypeScript/issues/25987#issuecomment-441224690
export type KnownKeys<T> = T extends PrimitiveTypes
	? never
	: {
			[K in keyof T]: string extends K ? never : number extends K ? never : K
	  } extends { [_ in keyof T]: infer U }
	? // eslint-disable-next-line @typescript-eslint/ban-types
	  {} extends U
		? never
		: U
	: never