rontolisp:stream-close

(rontolisp:stream-close stream)

Closes the write end of an asynchronous stream and returns nil. Buffered chunks stay readable; once they are drained, rontolisp:stream-read observes end of stream (nil). Closing an already-closed stream is a no-op. A rontolisp:stream-write after the close signals an error.

Backend support

Asynchronous streams exist on the interpreter, the JVM backend and -- for the request/response body streams rontolisp:fetch / rontolisp:http-handler produce -- the --component WASM backend. A Preview 1 WASM module can hold a stream value only when a host-backed body gives it one; where none can exist, rontolisp:streamp answers nil and rontolisp:stream-read / rontolisp:stream-close signal an error when called.