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, 8 insertions, 12 deletions

diff --git a/std/testing/test.ts b/std/testing/test.ts
index 93233f7cc..dd6d772f6 100644
--- a/std/testing/test.ts
+++ b/std/testing/test.ts
@@ -51,12 +51,10 @@ test(function testingAssertNotStrictEqual(): void {
 
 test(function testingDoesThrow(): void {
   let count = 0;
-  assertThrows(
-    (): void => {
-      count++;
-      throw new Error();
-    }
-  );
+  assertThrows((): void => {
+    count++;
+    throw new Error();
+  });
   assert(count === 1);
 });
 
@@ -64,12 +62,10 @@ test(function testingDoesNotThrow(): void {
   let count = 0;
   let didThrow = false;
   try {
-    assertThrows(
-      (): void => {
-        count++;
-        console.log("Hello world");
-      }
-    );
+    assertThrows((): void => {
+      count++;
+      console.log("Hello world");
+    });
   } catch (e) {
     assert(e.message === "Expected function to throw.");
     didThrow = true;