feat(driver): Add overwrite option to Cypress.Screenshot.defaults

packages/driver/cypress/integration/cypress/screenshot_spec.js

@@ -3,6 +3,7 @@ const { Screenshot } = Cypress
 const DEFAULTS = {
   capture: 'fullPage',
   scale: false,
+  overwrite: false,
   disableTimersAndAnimations: true,
   screenshotOnRunFailure: true,
   blackout: [],
@@ -64,6 +65,14 @@ describe('src/cypress/screenshot', () => {
       expect(Screenshot.getConfig().scale).to.equal(true)
     })
 
+    it('sets overwrite if specified', () => {
+      Screenshot.defaults({
+        overwrite: true,
+      })
+
+      expect(Screenshot.getConfig().overwrite).to.equal(true)
+    })
+
     it('sets disableTimersAndAnimations if specified', () => {
       Screenshot.defaults({
         disableTimersAndAnimations: false,
@@ -187,6 +196,20 @@ describe('src/cypress/screenshot', () => {
         .and.eq('https://on.cypress.io/screenshot-api')
       })
 
+      it('throws if overwrite is not a boolean', () => {
+        const fn = () => {
+          Screenshot.defaults({ overwrite: 'foo' })
+        }
+
+        expect(fn).to.throw()
+        .with.property('message')
+        .and.include('`Cypress.Screenshot.defaults()` `overwrite` option must be a boolean. You passed: `foo`')
+
+        expect(fn).to.throw()
+        .with.property('docsUrl')
+        .and.eq('https://on.cypress.io/screenshot-api')
+      })
+
       it('throws if disableTimersAndAnimations is not a boolean', () => {
         const fn = () => {
           Screenshot.defaults({ disableTimersAndAnimations: 'foo' })

packages/driver/src/cypress/screenshot.ts

@@ -12,6 +12,7 @@ const _reset = () => {
     disableTimersAndAnimations: true,
     screenshotOnRunFailure: true,
     blackout: [],
+    overwrite: false,
     onBeforeScreenshot () {},
     onAfterScreenshot () {},
   }

packages/runner/__snapshots__/retries.mochaEvents.spec.js

@@ -6476,6 +6476,7 @@ exports['src/cypress/runner retries mochaEvents screenshots retry screenshot in
       "height": 660
     },
     "scaled": false,
+    "overwrite": false,
     "blackout": [],
     "startTime": "match.string",
     "current": 1,
@@ -6491,7 +6492,8 @@ exports['src/cypress/runner retries mochaEvents screenshots retry screenshot in
   "scale": false,
   "waitForCommandSynchronization": false,
   "disableTimersAndAnimations": true,
-  "blackout": []
+  "blackout": [],
+  "overwrite": false
 }
 
 exports['serialize state - retries'] = {

packages/runner/__snapshots__/runner.mochaEvents.spec.js

@@ -1939,6 +1939,7 @@ exports['src/cypress/runner other specs screenshots screenshot after failed test
         "height": 660
       },
       "scaled": true,
+      "overwrite": false,
       "blackout": [],
       "startTime": "1970-01-01T00:00:00.000Z"
     }

packages/server/test/support/fixtures/projects/e2e/cypress/integration/screenshots_spec.js

@@ -333,6 +333,39 @@ describe('taking screenshots', () => {
     })
   })
 
+  // @see https://github.com/cypress-io/cypress/issues/7955
+  it('can set overwrite default option to replace existing filename', () => {
+    Cypress.Screenshot.defaults({
+      overwrite: true,
+    })
+
+    cy.viewport(600, 200)
+    cy.visit('http://localhost:3322/color/yellow')
+    cy.screenshot('overwrite-test', {
+      clip: { x: 10, y: 10, width: 160, height: 80 },
+    })
+
+    cy.task('check:screenshot:size', {
+      name: `${path.basename(__filename)}/overwrite-test.png`,
+      width: 160,
+      height: 80,
+      devicePixelRatio,
+    })
+
+    cy.screenshot('overwrite-test', {
+      clip: { x: 10, y: 10, width: 100, height: 50 },
+    })
+
+    cy.readFile(`cypress/screenshots/${path.basename(__filename)}/overwrite-test (1).png`).should('not.exist')
+
+    cy.task('check:screenshot:size', {
+      name: `${path.basename(__filename)}/overwrite-test.png`,
+      width: 100,
+      height: 50,
+      devicePixelRatio,
+    })
+  })
+
   context('before hooks', () => {
     before(() => {
       // failure 2