Type Alias MirrorComposition<T, P>

MirrorComposition: T & { [composition_key in P]: T }

a utility type that mirrors a type T, in addition to enclosing the object T under the composition property key P.

this utility type is used by the functions mirrorObjectThroughComposition and subclassThroughComposition.

Type Parameters

T
P extends PropertyKey

Example

const obj_a = {
	hello: "world",
	goodbye: "earth",
	answer() { return 42 },
}

const obj_b = {
	_super: obj_a, // composing/enclosing `obj_a`
	...obj_a,      // mirroring the methods and properties of `obj_a`
}

obj_b satisfies MirrorComposition<typeof obj_a, "_super">