feat: Allow for custom Parse.Error messages

Author: dplewis

src/CoreManager.js

@@ -194,6 +194,7 @@ const config: Config & { [key: string]: mixed } = {
   ENCRYPTED_USER: false,
   IDEMPOTENCY: false,
   ALLOW_CUSTOM_OBJECT_ID: false,
+  PARSE_ERRORS: [],
 };
 
 function requireMethods(name: string, methods: Array<string>, controller: any) {

src/ParseError.js

@@ -1,6 +1,10 @@
+import CoreManager from './CoreManager';
+
 /**
  * Constructs a new Parse.Error object with the given code and message.
  *
+ * Parse.CoreManager.set('PARSE_ERRORS', [{ code, message }]) can be use to override error messages for error codes except CONNECTION_FAILED (100).
+ *
  * @alias Parse.Error
  */
 class ParseError extends Error {
@@ -11,9 +15,15 @@ class ParseError extends Error {
   constructor(code, message) {
     super(message);
     this.code = code;
+    let customMessage = message;
+    CoreManager.get('PARSE_ERRORS').forEach((error) => {
+      if (error.code === code && error.code !== ParseError.CONNECTION_FAILED) {
+        customMessage = error.message;
+      }
+    });
     Object.defineProperty(this, 'message', {
       enumerable: true,
-      value: message,
+      value: customMessage,
     });
   }
 

src/__tests__/ParseError-test.js

@@ -1,6 +1,8 @@
 jest.dontMock('../ParseError');
+jest.dontMock('../CoreManager');
 
 const ParseError = require('../ParseError').default;
+const CoreManager = require('../CoreManager');
 
 describe('ParseError', () => {
   it('have sensible string representation', () => {
@@ -18,4 +20,24 @@ describe('ParseError', () => {
       code: 123,
     });
   });
+
+  it('can override message', () => {
+    CoreManager.set('PARSE_ERRORS', [{ code: 123, message: 'Oops.' }]);
+    const error = new ParseError(123, 'some error message');
+    expect(JSON.parse(JSON.stringify(error))).toEqual({
+      message: 'Oops.',
+      code: 123,
+    });
+    CoreManager.set('PARSE_ERRORS', []);
+  });
+
+  it('cannot override connection failed message', () => {
+    CoreManager.set('PARSE_ERRORS', [{ code: 100, message: 'Cannot connect to server' }]);
+    const error = new ParseError(100, 'some error message');
+    expect(JSON.parse(JSON.stringify(error))).toEqual({
+      message: 'some error message',
+      code: 100,
+    });
+    CoreManager.set('PARSE_ERRORS', []);
+  });
 });