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, 9 insertions, 15 deletions

diff --git a/std/fs/read_json_test.ts b/std/fs/read_json_test.ts
index a9362b0ac..c4c8d67d8 100644
--- a/std/fs/read_json_test.ts
+++ b/std/fs/read_json_test.ts
@@ -65,31 +65,25 @@ test(async function readValidObjJsonFileWithRelativePath(): Promise<void> {
 test(function readJsonFileNotExistsSync(): void {
   const emptyJsonFile = path.join(testdataDir, "json_not_exists.json");
 
-  assertThrows(
-    (): void => {
-      readJsonSync(emptyJsonFile);
-    }
-  );
+  assertThrows((): void => {
+    readJsonSync(emptyJsonFile);
+  });
 });
 
 test(function readEmptyJsonFileSync(): void {
   const emptyJsonFile = path.join(testdataDir, "json_empty.json");
 
-  assertThrows(
-    (): void => {
-      readJsonSync(emptyJsonFile);
-    }
-  );
+  assertThrows((): void => {
+    readJsonSync(emptyJsonFile);
+  });
 });
 
 test(function readInvalidJsonFile(): void {
   const invalidJsonFile = path.join(testdataDir, "json_invalid.json");
 
-  assertThrows(
-    (): void => {
-      readJsonSync(invalidJsonFile);
-    }
-  );
+  assertThrows((): void => {
+    readJsonSync(invalidJsonFile);
+  });
 });
 
 test(function readValidArrayJsonFileSync(): void {