That's not entirely true. Tree-shaking algorithms could have a “noDynamicAccess” option that errors on such use (only viable for applications, not libraries). A

That's not entirely true. Tree-shaking algorithms could have a “noDynamicAccess” option that errors on such use (only viable for applications, not libraries). Alternatively, the algorithm could be integrated with the TypeScript compiler API to allow dynamic access in some cases (e.g. where the `anything` function in your example only returns a “string literal” constant type or a union thereof, instead of the `string` type).