Can a function wrap be defined in a way that allows this code to work correctly?:
function wrap<Self>(
creator: (self: Self) => Self
) {}
wrap(self => ({
val: 2,
func(): number {
return self.val;
}
}));
The current TypeScript setup triggers an error at return self.val; with the message:
Property 'val' does not exist on type '{}'.
It is desired for wrap to inferred the type of self to be the same as the return value of the function.
The main issue lies in the fact that Self is simply a generic placeholder. The compiler lacks the knowledge of whether objects represented by Self actually possess a val attribute (or any other properties for that matter; they could potentially be of type {}).
To provide clarity on what can be anticipated from Self:
interface HasVal {
val: any;
}
function wrap<Self extends HasVal>(
creator: (self: Self) => Self
) {}
wrap(self => ({
val: 2,
func(): number {
return self.val;
}
}));
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