Disclosure
Most of the problems under my TypeHero Challenges folder were either obtained from typehero.dev or from type-challenges repo. Purpose of these articles are just to document my approaches for my easy reference. Please visit the respective links for more info.
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Problem Description
Implement the built-in Parameters generic without using it.
For example:
const foo = (arg1: string, arg2: number): void => {}
type FunctionParamsType = MyParameters<typeof foo> // [arg1: string, arg2: number]Solutions
Approach
type MyParameters<T extends (...args: any[]) => any> = T extends (...args: infer Params) => any
? Params
: never;