fix: typing error with props and attributes (#433)

* test: add attributes() and props() to type test

* fix: type props and attributes in BaseWrapper #432

Author: vwxyutarooo

types/index.d.ts

@@ -47,9 +47,9 @@ interface BaseWrapper {
   exists (): boolean
   visible (): boolean
 
-  attributes(): { [name: string]: string } | void
+  attributes(): { [name: string]: string }
   classes(): Array<string> | void
-  props(): { [name: string]: any } | void
+  props(): { [name: string]: any }
 
   hasAttribute (attribute: string, value: string): boolean
   hasClass (className: string): boolean

types/test/wrapper.ts

@@ -13,8 +13,10 @@ bool = wrapper.contains(ClassComponent)
 bool = wrapper.exists()
 
 bool = wrapper.hasAttribute('foo', 'bar')
+bool = wrapper.attributes().foo === 'bar'
 bool = wrapper.hasClass('foo-class')
 bool = wrapper.hasProp('checked', true)
+bool = wrapper.props().checked
 bool = wrapper.hasStyle('color', 'red')
 
 bool = wrapper.is(normalOptions)