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/fs/ensure_link_test.ts b/std/fs/ensure_link_test.ts
index 044f80f8d..d15e5c1f6 100644
--- a/std/fs/ensure_link_test.ts
+++ b/std/fs/ensure_link_test.ts
@@ -31,11 +31,9 @@ test(function ensureLinkSyncIfItNotExist(): void {
   const testFile = path.join(testDir, "test.txt");
   const linkFile = path.join(testDir, "link.txt");
 
-  assertThrows(
-    (): void => {
-      ensureLinkSync(testFile, linkFile);
-    }
-  );
+  assertThrows((): void => {
+    ensureLinkSync(testFile, linkFile);
+  });
 
   Deno.removeSync(testDir, { recursive: true });
 });