`as const` is useful there as well, as TypeScript’s type inference only narrows as far as the type and not the literal value. `let z = {text: "hello"}` has the shape `{text: string}`, with `as const` it has the shape `{text: "hello"}`.
Why use "let" along with "as const" instead of mere "const x = 'hello'" for that?
This is different to the widening of value types within objects, which is a tradeoff made towards unsoundness with the belief that it would otherwise make interoperability with existing js too difficult, for which `as const` now serves as a way to explicitly opt into sounder behavior.