refactor(ts'ify): ts’ify mocks, directives and test_lib

Also cleans up global types.

modules/angular2/src/directives/ng_if.ts

@@ -0,0 +1,51 @@
+import {Directive} from 'angular2/annotations';
+import {ViewContainerRef, ProtoViewRef} from 'angular2/core';
+import {isBlank} from 'angular2/src/facade/lang';
+
+/**
+ * Removes or recreates a portion of the DOM tree based on an {expression}.
+ *
+ * If the expression assigned to `if` evaluates to a false value then the element is removed from
+ * the
+ * DOM, otherwise a clone of the element is reinserted into the DOM.
+ *
+ * # Example:
+ *
+ * ```
+ * <div *ng-if="errorCount > 0" class="error">
+ *   <!-- Error message displayed when the errorCount property on the current context is greater
+ * than 0. -->
+ *   {{errorCount}} errors detected
+ * </div>
+ * ```
+ *
+ * # Syntax
+ *
+ * - `<div *ng-if="condition">...</div>`
+ * - `<div template="ng-if condition">...</div>`
+ * - `<template [ng-if]="condition"><div>...</div></template>`
+ *
+ * @exportedAs angular2/directives
+ */
+@Directive({selector: '[ng-if]', properties: {'ngIf': 'ngIf'}})
+export class NgIf {
+  viewContainer: ViewContainerRef;
+  protoViewRef: ProtoViewRef;
+  prevCondition: boolean;
+
+  constructor(viewContainer: ViewContainerRef, protoViewRef: ProtoViewRef) {
+    this.viewContainer = viewContainer;
+    this.prevCondition = null;
+    this.protoViewRef = protoViewRef;
+  }
+
+  set ngIf(newCondition /* boolean */) {
+    if (newCondition && (isBlank(this.prevCondition) || !this.prevCondition)) {
+      this.prevCondition = true;
+      this.viewContainer.create(this.protoViewRef);
+    } else if (!newCondition && (isBlank(this.prevCondition) || this.prevCondition)) {
+      this.prevCondition = false;
+      this.viewContainer.clear();
+    }
+  }
+}