Update prettier and eslint rules to enforce trailing comma

Author: Kadi Kraman

.eslintrc

@@ -16,3 +16,6 @@ rules:
     - off
   arrow-parens:
     - off
+  comma-dangle:
+    - 2
+    - always-multiline

.prettierrc

@@ -1,4 +1,5 @@
 {
   "printWidth": 100,
-  "singleQuote": true
+  "singleQuote": true,
+  "semi": true
 }

index.js

@@ -61,9 +61,9 @@ export default class AppAuth {
     return await fetch(openidConfig.revocation_endpoint, {
       method: 'POST',
       headers: {
-        'Content-Type': 'application/x-www-form-urlencoded'
+        'Content-Type': 'application/x-www-form-urlencoded',
       },
-      body: `token=${tokenToRevoke}${sendClientId ? `&client_id=${this.config.clientId}` : ''}`
+      body: `token=${tokenToRevoke}${sendClientId ? `&client_id=${this.config.clientId}` : ''}`,
     }).catch(error => {
       throw new Error('Failed to revoke token', error);
     });

index.spec.js

@@ -4,9 +4,9 @@ jest.mock('react-native', () => ({
   NativeModules: {
     RNAppAuth: {
       authorize: jest.fn(),
-      refresh: jest.fn()
-    }
-  }
+      refresh: jest.fn(),
+    },
+  },
 }));
 
 describe('AppAuth', () => {
@@ -16,7 +16,7 @@ describe('AppAuth', () => {
   const config = {
     issuer: 'test-issuer',
     redirectUrl: 'test-redirectUrl',
-    clientId: 'test-clientId'
+    clientId: 'test-clientId',
   };
 
   beforeAll(() => {