fix(ext/net): fix string port number handling in listen (#19921)

While string `port` is not allowed in typing, it seems we used to
support that and now it's broken. ref:
https://github.com/denoland/deno/issues/10064#issuecomment-1637427260

This PR restores the support of string port number in `listen` and
`listenTls`

1 files changed, 9 insertions, 0 deletions

diff --git a/cli/tests/unit/net_test.ts b/cli/tests/unit/net_test.ts
index 32250bbd0..ca4c5191c 100644
--- a/cli/tests/unit/net_test.ts
+++ b/cli/tests/unit/net_test.ts
@@ -1237,3 +1237,12 @@ Deno.test({
   }, Deno.errors.AddrInUse);
   listener1.close();
 });
+
+Deno.test({
+  permissions: { net: true },
+}, function netTcpListenDoesNotThrowOnStringPort() {
+  // @ts-ignore String port is not allowed by typing, but it shouldn't throw
+  // for backwards compatibility.
+  const listener = Deno.listen({ hostname: "localhost", port: "0" });
+  listener.close();
+});