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, 14 insertions, 22 deletions

diff --git a/std/fs/ensure_file_test.ts b/std/fs/ensure_file_test.ts
index bb23084a8..efd88d983 100644
--- a/std/fs/ensure_file_test.ts
+++ b/std/fs/ensure_file_test.ts
@@ -14,11 +14,9 @@ test(async function ensureFileIfItNotExist(): Promise<void> {
 
   await assertThrowsAsync(
     async (): Promise<void> => {
-      await Deno.stat(testFile).then(
-        (): void => {
-          throw new Error("test file should exists.");
-        }
-      );
+      await Deno.stat(testFile).then((): void => {
+        throw new Error("test file should exists.");
+      });
     }
   );
 
@@ -31,12 +29,10 @@ test(function ensureFileSyncIfItNotExist(): void {
 
   ensureFileSync(testFile);
 
-  assertThrows(
-    (): void => {
-      Deno.statSync(testFile);
-      throw new Error("test file should exists.");
-    }
-  );
+  assertThrows((): void => {
+    Deno.statSync(testFile);
+    throw new Error("test file should exists.");
+  });
 
   Deno.removeSync(testDir, { recursive: true });
 });
@@ -52,11 +48,9 @@ test(async function ensureFileIfItExist(): Promise<void> {
 
   await assertThrowsAsync(
     async (): Promise<void> => {
-      await Deno.stat(testFile).then(
-        (): void => {
-          throw new Error("test file should exists.");
-        }
-      );
+      await Deno.stat(testFile).then((): void => {
+        throw new Error("test file should exists.");
+      });
     }
   );
 
@@ -72,12 +66,10 @@ test(function ensureFileSyncIfItExist(): void {
 
   ensureFileSync(testFile);
 
-  assertThrows(
-    (): void => {
-      Deno.statSync(testFile);
-      throw new Error("test file should exists.");
-    }
-  );
+  assertThrows((): void => {
+    Deno.statSync(testFile);
+    throw new Error("test file should exists.");
+  });
 
   Deno.removeSync(testDir, { recursive: true });
 });