fix(events): add selection-related properties to target (#264)

Author: diego-codes

src/__tests__/events.js

@@ -160,6 +160,19 @@ test('assigns target properties', () => {
   expect(node.value).toBe(value)
 })
 
+test('assigns selection-related target properties', () => {
+  const node = document.createElement('input')
+  const spy = jest.fn()
+  const value = 'ab'
+  const selectionStart = 1
+  const selectionEnd = 2
+  node.addEventListener('change', spy)
+  fireEvent.change(node, {target: {value, selectionStart, selectionEnd}})
+  expect(node.value).toBe(value)
+  expect(node.selectionStart).toBe(selectionStart)
+  expect(node.selectionEnd).toBe(selectionEnd)
+})
+
 test('assigning a value to a target that cannot have a value throws an error', () => {
   const node = document.createElement('div')
   expect(() =>

src/events.js

@@ -316,7 +316,6 @@ Object.keys(eventMap).forEach(key => {
   createEvent[key] = (node, init) => {
     const eventInit = {...defaultInit, ...init}
     const {target: {value, files, ...targetProperties} = {}} = eventInit
-    Object.assign(node, targetProperties)
     if (value !== undefined) {
       setNativeValue(node, value)
     }
@@ -331,6 +330,7 @@ Object.keys(eventMap).forEach(key => {
         value: files,
       })
     }
+    Object.assign(node, targetProperties)
     const window = getWindowFromNode(node)
     const EventConstructor = window[EventType] || window.Event
     return new EventConstructor(eventName, eventInit)