feat(router): lifecycle hooks

Closes #2640

modules/angular2/src/router/interfaces.ts

@@ -0,0 +1,43 @@
+import {Instruction} from './instruction';
+import {global} from 'angular2/src/facade/lang';
+
+// This is here only so that after TS transpilation the file is not empty.
+// TODO(rado): find a better way to fix this, or remove if likely culprit
+// https://github.com/systemjs/systemjs/issues/487 gets closed.
+var __ignore_me = global;
+
+
+/**
+ * Defines route lifecycle method [onActivate]
+ */
+export interface OnActivate {
+  onActivate(nextInstruction: Instruction, prevInstruction: Instruction): any;
+}
+
+/**
+ * Defines route lifecycle method [onReuse]
+ */
+export interface OnReuse {
+  onReuse(nextInstruction: Instruction, prevInstruction: Instruction): any;
+}
+
+/**
+ * Defines route lifecycle method [onDeactivate]
+ */
+export interface OnDeactivate {
+  onDeactivate(nextInstruction: Instruction, prevInstruction: Instruction): any;
+}
+
+/**
+ * Defines route lifecycle method [canReuse]
+ */
+export interface CanReuse {
+  canReuse(nextInstruction: Instruction, prevInstruction: Instruction): any;
+}
+
+/**
+ * Defines route lifecycle method [canDeactivate]
+ */
+export interface CanDeactivate {
+  canDeactivate(nextInstruction: Instruction, prevInstruction: Instruction): any;
+}