Typescript has almost identical semantics to Javascript but adds typing syntax to improve developer experience and make it easier to manage a large-scale JS codebase.
Zig is a fundamentally different language than C that has a lot of new features. Two great examples are comptime and allocators which have complements in C, but are really very different from what C provides.
If you're suggesting that zig is aiming to provide a C alternative with better ergonomics, then I agree; but zig and C have a lot more differences than Typescript and Javascript.
Zig has more things for C interop than you're suggesting though, namely the extern keyword, calling convention, etc. Like ts/js, zig/c seems first class designed be used together in one codebase, compared to eg Rust where is obviously possible but more deliberately discouraged (since it breaks the safety guarantees, which Zig never claimed to begin with)
Zig OTH is "just C" but with a modern syntax, much more correctness, comptime, reflection, generics, a rich standard library, an integrated build system, cross-compiling that 'just works'.
