[types] fix Collection.filterBy value argument

Author: ro0gr

types/collection-test.ts

@@ -28,6 +28,7 @@ b.items.mapBy('a'); // $ExpectType any[]
 b.items.mapBy('text'); // $ExpectType any[]
 b.items.filterBy('a'); // $ExpectType Component<{ a: number; }>[]
 b.items.filterBy('value'); // $ExpectType Component<{ a: number; }>[]
+b.items.filterBy('value', ''); // $ExpectType Component<{ a: number; }>[]
 b.items.findOne((a) => a.a === 1); // $ExpectType Component<{ a: number; }>
 b.items.findOneBy('value', 1); // $ExpectType Component<{ a: number; }>
 b.items.forEach((node, _i: number) => {

types/index.d.ts

@@ -45,7 +45,7 @@ declare module 'ember-cli-page-object' {
     [Symbol.iterator](): Iterator<Component<T>>;
 
     filter(callback: (c: Component<T>) => boolean): Array<Component<T>>;
-    filterBy(propName: keyof T | keyof DSL<T>): Array<Component<T>>;
+    filterBy(propName: keyof T | keyof DSL<T>, value?: any): Array<Component<T>>;
     findOne(callback: (c: Component<T>) => boolean): Component<T>;
     findOneBy(propName: keyof T | keyof DSL<T>, value: any): Component<T>;
     forEach(callback: (c: Component<T>, i: number) => void): void;