Let's consider including an extension method to the existing Object:
declare global {
interface Object {
ext<B>(f: (x: this) => B): B;
}
}
The aim is to apply it as shown below:
"x".ext(x => x.toUpperCase())
//or
(1).ext(x => x + 1)
However, this won't work, as the function's x parameter is assumed to be Object.
I expect it to be assumed as "this" (String/Number in these scenarios), the type of .ext()'s receiver.
Just a friendly reminder: extending native prototypes like Object.prototype is generally considered bad practice. It can lead to unexpected behavior and conflicts with other code. It's recommended to use a separate function with the object passed as a parameter instead. Disclaimer over!
If you want the compiler to handle this, consider using generics and adding a this parameter to the method. By doing so, the compiler can infer the types for you:
declare global {
interface Object {
ext<B, T>(this: T, f: (x: T) => B): B;
}
}
With this setup, you can use:
"x".ext(x => x.toUpperCase()); // it works
(1).ext(x => x + 1) // it works too
This might not cover all scenarios, but it has been successful in the cases I've tested. Hope this information proves useful. Good luck!
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