Avoid Error cloning error in Worker promise/rejection case

src/contexts/BrowserWorker.js

@@ -86,6 +86,9 @@
 			case 'console':
 				window.console && window.console[data.method].apply(window.console, data.args);
 				break;
+			case 'deferred_reject_error':
+				this.deferreds[data.token].reject(data.error);
+				break;
 			case 'result':
 
 				var callback = this.callbacks[data.token];
@@ -275,6 +278,26 @@ function workerBoilerScript() {
 				return def;
 			}
 			function reject(r, transfers) {
+				if (r instanceof Error) {
+					// Create an error object that can be cloned: (See #44/#45):
+					var cloneableError = {
+						message: r.message,
+						stack: r.stack,
+						name: r.name,
+						code: r.code
+					};
+					for (var i in r) {
+						if (r.hasOwnProperty(i)) {
+							cloneableError[i] = r[i];
+						}
+					}
+					postMessage({
+						cmd: 'deferred_reject_error',
+						token: data.token,
+						error: cloneableError
+					});
+					return;
+				}
 				returnResult({
 					isDeferred: true,
 					action: 'reject',

test/operative.iframe.spec.js

@@ -97,6 +97,22 @@ describe('Operative (forced iframe context)', function() {
 					});
 				});
 			});
+			describe('Rejecting with an error', function() {
+				it('Should reject correctly', function(done) {
+					var op = operative(function() {
+						var deferred = this.deferred();
+						deferred.reject(new Error('foo 789'));
+					});
+					op().then(function() {
+						expect(true).to.be.false; // fail
+						done();
+					}).catch(function(err) {
+						console.log(err);
+						expect(err.message).to.equal('foo 789'); // pass
+						done();
+					});
+				});
+			});
 		});
 	});
 

test/operative.spec.js

@@ -107,6 +107,39 @@ describe('Operative (worker Context)', function() {
 					});
 				});
 			});
+			describe('Rejecting with an error', function() {
+				it('Should reject correctly', function(done) {
+					var op = operative(function() {
+						var deferred = this.deferred();
+						deferred.reject(new Error('foo 789'));
+					});
+					op().then(function() {
+						expect(true).to.be.false; // fail
+						done();
+					}).catch(function(err) {
+						expect(err.message).to.equal('foo 789'); // pass
+						done();
+					});
+				});
+				describe('With additional props', function() {
+					it('Should reject correctly and be received with props', function(done) {
+						var op = operative(function() {
+							var deferred = this.deferred();
+							var error = new Error('foo');
+							error.custom = 123;
+							deferred.reject(error);
+						});
+						op().then(function() {
+							expect(true).to.be.false; // fail
+							done();
+						}).catch(function(err) {
+							expect(err.message).to.equal('foo');
+							expect(err.custom).to.equal(123);
+							done();
+						});
+					});
+				});
+			});
 		});
 	});