feat(build): require parameter types

Fixes #2833

modules/angular2/src/di/binding.ts

@@ -309,13 +309,13 @@ export class BindingBuilder {
    * expect(injector.get(String)).toEqual('Hello');
    * ```
    */
-  toValue(value): Binding { return new Binding(this.token, {toValue: value}); }
+  toValue(value: any): Binding { return new Binding(this.token, {toValue: value}); }
 
   /**
    * Binds a key to the alias for an existing key.
    *
    * An alias means that we will return the same instance as if the alias token was used. (This is
-   * in contrast to `toClass` where a separet instance of `toClass` will be returned.)
+   * in contrast to `toClass` where a separate instance of `toClass` will be returned.)
    *
    * ## Example
    *
@@ -344,7 +344,7 @@ export class BindingBuilder {
    * expect(injectorClass.get(Vehicle) instanceof Car).toBe(true);
    * ```
    */
-  toAlias(aliasToken): Binding {
+  toAlias(aliasToken: /*Type*/ any): Binding {
     if (isBlank(aliasToken)) {
       throw new BaseException(`Can not alias ${stringify(this.token)} to a blank value!`);
     }

modules/angular2/src/di/exceptions.ts

@@ -42,7 +42,7 @@ export class AbstractBindingError extends BaseException {
   }
 
   // TODO(tbosch): Can't do key:Key as this results in a circular dependency!
-  addKey(key): void {
+  addKey(key: any): void {
     this.keys.push(key);
     this.message = this.constructResolvingMessage(this.keys);
   }

modules/angular2/src/di/injector.ts

@@ -480,7 +480,7 @@ export class Injector {
    *binding).
    * @returns an instance represented by the token. Throws if not found.
    */
-  get(token): any {
+  get(token: any): any {
     return this._getByKey(Key.get(token), DEFAULT_VISIBILITY, false, PUBLIC_AND_PRIVATE);
   }
 
@@ -490,7 +490,7 @@ export class Injector {
    * @param `token`: usually a `Type`. (Same as the token used while setting up a binding).
    * @returns an instance represented by the token. Returns `null` if not found.
    */
-  getOptional(token): any {
+  getOptional(token: any): any {
     return this._getByKey(Key.get(token), DEFAULT_VISIBILITY, true, PUBLIC_AND_PRIVATE);
   }
 

modules/angular2/src/di/key.ts

@@ -30,7 +30,7 @@ export class Key {
   /**
    * Retrieves a `Key` for a token.
    */
-  static get(token): Key { return _globalKeyRegistry.get(resolveForwardRef(token)); }
+  static get(token: Object): Key { return _globalKeyRegistry.get(resolveForwardRef(token)); }
 
   /**
    * @returns the number of keys registered in the system.