/* eslint-disable @typescript-eslint/no-explicit-any */
/** * Obtain the return type of a function type * ...(event if the function type can be nullish). * Better that the default because prevent from having to do ReturnType<NonNullable<typeof f>> */export type ReturnType< T extends ((...args: any[]) => unknown) | undefined | null | false | ""> = T extends (...args: any[]) => infer R ? (R extends PromiseLike<infer J> ? J : R) : never;
// ReturnType<(()=> Promise<string> | number) | undefined> = (()=> Promise<string> | number) | undefined extends (...args: any[]) => infer R ?// = ( ()=> Promise<string> | number extends (...args: any[]) => infer R ? ) | (undefined extends (...args: any[]) => infer R ? )// = ( Promise<string> | number extends PromiseLike<infer J> ? ) | never// = Promise<string> | number extends PromiseLike<infer J> ?// = ( Promise<string> extends PromiseLike<infer J> ?) | ( number extends PromiseLike<infer J> ?)// = string | number