Update to TypeScript 3.7 (#3275)

and update to prettier 1.19

Also, update `assert()` and remove not null assertions where possibly
in `cli`.

Closes #3273

1 files changed, 3 insertions, 5 deletions

diff --git a/std/ws/example_server.ts b/std/ws/example_server.ts
index ea981256e..cb8ec61cd 100644
--- a/std/ws/example_server.ts
+++ b/std/ws/example_server.ts
@@ -52,9 +52,7 @@ for await (const req of serve(`:${port}`)) {
         }
       }
     )
-    .catch(
-      (err: Error): void => {
-        console.error(`failed to accept websocket: ${err}`);
-      }
-    );
+    .catch((err: Error): void => {
+      console.error(`failed to accept websocket: ${err}`);
+    });
 }