use devalue instead of serialize-javascript - fixes #112

test/app/routes/preload-values/custom-class.html

@@ -0,0 +1,17 @@
+<h1>{{foo.bar()}}</h1>
+
+<script>
+	export default {
+		preload() {
+			class Foo {
+				bar() {
+					return 42;
+				}
+			}
+
+			return {
+				foo: new Foo()
+			};
+		}
+	};
+</script>

test/app/routes/preload-values/set.html

@@ -0,0 +1,11 @@
+<h1>{{set.has('x')}}</h1>
+
+<script>
+	export default {
+		preload() {
+			return {
+				set: new Set(['x'])
+			};
+		}
+	};
+</script>

test/common/test.js

@@ -487,6 +487,30 @@ function run(env) {
 						assert.equal(title, `I'm afraid I just blue myself`);
 					});
 			});
+
+			it('serializes Set objects returned from preload', () => {
+				return nightmare.goto(`${base}/preload-values/set`)
+					.page.title()
+					.then(title => {
+						assert.equal(title, 'true');
+						return nightmare.init().page.title();
+					})
+					.then(title => {
+						assert.equal(title, 'true');
+					});
+			});
+
+			it('bails on custom classes returned from preload', () => {
+				return nightmare.goto(`${base}/preload-values/custom-class`)
+					.page.title()
+					.then(title => {
+						assert.equal(title, '42');
+						return nightmare.init().page.title();
+					})
+					.then(title => {
+						assert.equal(title, '42');
+					});
+			});
 		});
 
 		describe('headers', () => {