Use Prettier JS (#5017)

* Adds prettier

* Run lint before tests

src/cryptoUtils.js

@@ -8,7 +8,7 @@ export function randomHexString(size: number): string {
     throw new Error('Zero-length randomHexString is useless.');
   }
   if (size % 2 !== 0) {
-    throw new Error('randomHexString size must be divisible by 2.')
+    throw new Error('randomHexString size must be divisible by 2.');
   }
   return randomBytes(size / 2).toString('hex');
 }
@@ -23,9 +23,8 @@ export function randomString(size: number): string {
   if (size === 0) {
     throw new Error('Zero-length randomString is useless.');
   }
-  const chars = ('ABCDEFGHIJKLMNOPQRSTUVWXYZ' +
-               'abcdefghijklmnopqrstuvwxyz' +
-               '0123456789');
+  const chars =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZ' + 'abcdefghijklmnopqrstuvwxyz' + '0123456789';
   let objectId = '';
   const bytes = randomBytes(size);
   for (let i = 0; i < bytes.length; ++i) {
@@ -45,5 +44,7 @@ export function newToken(): string {
 }
 
 export function md5Hash(string: string): string {
-  return createHash('md5').update(string).digest('hex');
+  return createHash('md5')
+    .update(string)
+    .digest('hex');
 }