Merge pull request #36 from canjs/can-define-397-default-value

Fixes can-define#397. ResolverObservable accepts default value

Author: justinbmeyer

resolver/resolver-test.js

@@ -270,3 +270,10 @@ QUnit.test("reading observables does not leak the observable read", function(){
     QUnit.equal(records.keyDependencies.size, 0, "there are no key dependencies");
     QUnit.equal(records.valueDependencies.size, 0, "there are no valueDependencies");
 });
+
+QUnit.test("initial value on lastSet can be set (can-define#397)", function () {
+    var defaulted = new ResolverObservable(function(props) {
+        QUnit.equal(props.lastSet.get(), 5, "observable has default value");
+    }, {}, 5);
+    defaulted.get();
+});

resolver/resolver.js

@@ -10,15 +10,15 @@ var SimpleObservable = require("../can-simple-observable");
 
 var getChangesSymbol = canSymbol.for("can.getChangesDependencyRecord");
 
-function ResolverObservable(resolver, context) {
+function ResolverObservable(resolver, context, initialValue) {
 	// we don't want reads leaking out.  We should be binding to all of this ourselves.
 	this.resolver = ObservationRecorder.ignore(resolver);
 	this.context = context;
 	this._valueOptions = {
 		resolve: this.resolve.bind(this),
 		listenTo: this.listenTo.bind(this),
 		stopListening: this.stopListening.bind(this),
-		lastSet: new SimpleObservable(undefined)
+		lastSet: new SimpleObservable(initialValue)
 	};
 
 	this.update = this.update.bind(this);