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, 5 insertions, 7 deletions

diff --git a/cli/tests/workers_startup_bench.ts b/cli/tests/workers_startup_bench.ts
index fbea4dc40..5d2c24b89 100644
--- a/cli/tests/workers_startup_bench.ts
+++ b/cli/tests/workers_startup_bench.ts
@@ -5,13 +5,11 @@ async function bench(): Promise<void> {
   const workers: Worker[] = [];
   for (let i = 1; i <= workerCount; ++i) {
     const worker = new Worker("./subdir/bench_worker.ts");
-    const promise = new Promise(
-      (resolve): void => {
-        worker.onmessage = (e): void => {
-          if (e.data.cmdId === 0) resolve();
-        };
-      }
-    );
+    const promise = new Promise((resolve): void => {
+      worker.onmessage = (e): void => {
+        if (e.data.cmdId === 0) resolve();
+      };
+    });
     worker.postMessage({ cmdId: 0, action: 2 });
     await promise;
     workers.push(worker);