Context / Reproduction type Example = { a: string, b: number } let value: Example = { a: ‘hello’, b: 10, } // This IIFE is because typescript will narrow the type if assigned directly like // const k: keyof Example = ‘a’ const k = ((): keyof Example => ‘a’)() value = { …value, […]

I want to create a type AnyObject that can have any arbitrary key and value but error for possibly undefined.

I want to create a type AnyObject that can have any arbitrary key and value but error for possibly undefined.

I want to create a type AnyObject that can have any arbitrary key and value but error for possibly undefined.

This question is related, but a) I only care about string union types and b) I care about the type inference within the function body, not (only) the outside view.

Minimal example of the problem:

Initializer type defined as a utility type in reduce works but type assertion and type inference fail.

Initializer type defined as a utility type in reduce works but type assertion and type inference fail.

Initializer type defined as a utility type in reduce works but type assertion and type inference fail.

I am trying to create similar createElement method of my own custom DOM (with custom nodes) for my project, which takes nodeName as argument and returns an instance of corresponding Node.