Do not require this for createAction().matches

This has led to a `TypeError` when trying to call `matches()`
independently of the action creator object, for instances when
passing `actionCreator.matches` to `filter()` without an explicit
`bind(actionCreator)`.

Author: denisw

src/createAction.ts

@@ -22,7 +22,7 @@ export default function createAction<T extends string | symbol | number>(
     type,
 
     matches(a: Action<T>): a is Action<T> {
-      return this.type === a.type
+      return a.type == type
     },
 
     withPayload<P>(): PayloadActionCreator<P, T> {

test/createAction.test.ts

@@ -51,6 +51,12 @@ describe('payload action creator', () => {
     expect(incrementBy.matches(decrementBy(1))).toBe(false)
   })
 
+  test('matches() does not require `this` context', () => {
+    const incrementBy = createAction('incrementBy').withPayload<number>()
+    const matches = incrementBy.matches
+    expect(matches(incrementBy(1))).toBe(true)
+  })
+
   test('[TypeScript] matches() is a type predicate', () => {
     const incrementBy = createAction('incrementBy').withPayload<number>()
     const action: Action<unknown> = incrementBy(1)