[refactored] EqualityCheck type to use upper case

Reviewers: O2 Material Motion, O3 Material JavaScript platform reviewers, #material_motion, markwei

Reviewed By: O2 Material Motion, #material_motion, markwei

Tags: #material_motion

Differential Revision: http://codereview.cc/D3073

packages/core/src/operators/dedupe.ts

@@ -18,22 +18,22 @@ import * as deepEqual from 'deep-equal';
 
 import {
   Constructor,
+  EqualityCheck,
   NextChannel,
   Observable,
   ObservableWithFoundationalMotionOperators,
-  equalityCheck,
 } from '../types';
 
 export interface MotionDeduplicable<T> {
-  dedupe(areEqual: equalityCheck): Observable<T>;
+  dedupe(areEqual?: EqualityCheck): Observable<T>;
 }
 
 export function withDedupe<T, S extends Constructor<ObservableWithFoundationalMotionOperators<T>>>(superclass: S): S & Constructor<MotionDeduplicable<T>> {
   return class extends superclass implements MotionDeduplicable<T> {
     /**
      * Ensures that every value dispatched is different than the previous one.
      */
-    dedupe(areEqual: equalityCheck = deepEqual): Observable<T> {
+    dedupe(areEqual: EqualityCheck = deepEqual): Observable<T> {
       let dispatched = false;
       let lastValue: T;
 

packages/core/src/types.ts

@@ -114,7 +114,7 @@ export interface MotionElement {
   getEvent$(type: string): MotionObservable<Event>;
 }
 
-export type equalityCheck = (a: any, b: any) => boolean;
+export type EqualityCheck = (a: any, b: any) => boolean;
 
 export type SpringProperties<T> = {
   state: PropertyObservable<State>,