cypress-io · kuceb · Sep 10, 2020 · Aug 12, 2020 · Aug 12, 2020 · Aug 12, 2020
diff --git a/packages/driver/cypress/fixtures/issue-6125.html b/packages/driver/cypress/fixtures/issue-6125.html
@@ -0,0 +1,20 @@
+<!-- Simplified version of https://signin.simple.com-->
+
+<!doctype html>
+<html lang="en"> 
+  <head>
+    <title>Sign In | Simple</title>
+  </head>
+<body>
+  <form id="login">
+    <label for="login_username">Username</label>
+    <input type="text" name="username" id="login_username" autofocus="autofocus" tabindex="1" autocapitalize="off" autocorrect="off" autocomplete="off" class="validate-text validate-username validate-email-username" />
+
+    <label for="login_password">Password</label>
+    <input type="password" name="password" id="login_password" tabindex="2" autocomplete="off" class="validate-text" />
+
+    <input type="submit" id="signin-btn" class="btn -primary" value="Sign In" tabindex="4" disabled>
+  </form>
+  <script src="issue-6125.js" type="text/javascript"></script>
+</body>
+</html>
diff --git a/packages/driver/cypress/fixtures/issue-6125.js b/packages/driver/cypress/fixtures/issue-6125.js
@@ -0,0 +1,12 @@
+// Extracted the code that causes the problem in signin.simple.com
+// The cause was overriding the Event class.
+
+(function() {
+  this.Event = function(n, i) {
+    const r = n.type
+
+    if (r.indexOf("key")) {
+      // do something 
+    }
+  }
+})()
diff --git a/packages/driver/cypress/integration/commands/actions/type_spec.js b/packages/driver/cypress/integration/commands/actions/type_spec.js
@@ -177,6 +177,28 @@ describe('src/cy/commands/actions/type - #type', () => {
     .should('have.value', 'foobar')
   })
 
+  // https://github.com/cypress-io/cypress/issues/6125
+  it('works even if Event class is overridden', () => {
+    cy.visit('fixtures/issue-6125.html')
+    cy.get('#login_username')
+    .type('foobar')
+  })
+
+  // https://github.com/cypress-io/cypress/issues/5650
+  it('should trigger KeyboardEvent, not Event, for event listeners', (done) => {
+    cy.$$('input:first').on('keydown', (e) => {
+      if (e.originalEvent instanceof e.currentTarget.ownerDocument.defaultView.KeyboardEvent) {
+        done()
+
+        return
+      }
+
+      throw new Error('event was not instanceOf KeyboardEvent')
+    })
+
+    cy.get('input:first').type('A')
+  })
+
   describe('actionability', () => {
     it('can forcibly type + click even when element is invisible', () => {
       const $txt = cy.$$(':text:first').hide()

diff --git a/packages/driver/src/cy/commands/actions/type.js b/packages/driver/src/cy/commands/actions/type.js
@@ -202,19 +202,25 @@ module.exports = function (Commands, Cypress, cy, state, config) {
           return
         }
 
-        // issue the click event to the 'default button' of the form
-        // we need this to be synchronous so not going through our
-        // own click command
-        // as of now, at least in Chrome, causing the click event
-        // on the button will indeed trigger the form submit event
-        // so we dont need to fire it manually anymore!
-        if (!clickedDefaultButton(defaultButton)) {
-          // if we werent able to click the default button
-          // then synchronously fire the submit event
-          // currently this is sync but if we use a waterfall
-          // promise in the submit command it will break again
-          // consider changing type to a Promise and juggle logging
-          return cy.now('submit', form, { log: false, $el: form })
+        // In Firefox, submit event is automatically fired
+        // when we send {Enter} KeyboardEvent to the input fields.
+        // Because of that, we don't have to click the submit buttons.
+        // Otherwise, we trigger submit events twice.
+        if (!Cypress.isBrowser('firefox')) {
+          // issue the click event to the 'default button' of the form
+          // we need this to be synchronous so not going through our
+          // own click command
+          // as of now, at least in Chrome, causing the click event
+          // on the button will indeed trigger the form submit event
+          // so we dont need to fire it manually anymore!
+          if (!clickedDefaultButton(defaultButton)) {
+            // if we werent able to click the default button
+            // then synchronously fire the submit event
+            // currently this is sync but if we use a waterfall
+            // promise in the submit command it will break again
+            // consider changing type to a Promise and juggle logging
+            return cy.now('submit', form, { log: false, $el: form })
+          }
         }
       }
 

diff --git a/packages/driver/src/cy/keyboard.ts b/packages/driver/src/cy/keyboard.ts
@@ -900,10 +900,15 @@ export class Keyboard {
 
       // or is IE
     } else {
-      // For some reason we can't set certain props on Keyboard Events in chrome < 63.
-      // So we'll use the plain Event constructor
-      // event = new win[eventConstructor](eventType, eventOptions)
-      event = new win['Event'](eventType, eventOptions)
+      let constructor = win[eventConstructor]
+
+      // When event constructor doesn't exist, fallback to KeyboardEvent.
+      // It's necessary because Firefox doesn't support InputEvent.
+      if (typeof constructor !== 'function') {
+        constructor = win['KeyboardEvent']
+      }
+
+      event = new constructor(eventType, eventOptions)
       _.extend(event, eventOptions)
     }