Async functions - chung-leong/zigar GitHub Wiki
A Zig function becomes an async function on the JavaScript side when it accepts a
Promise as an argument. Instead of being returned, the return value will be passed to
the promise struct’s resolve() method.
A Generator argument works in a similar manner. Its turns a Zig function into an async
generator function on the JavaScript side. Instead of one value, multiple values are returned
asynchronously to the caller through the struct's
yield() method.