chore: add option to disable command log

packages/runner/cypress/integration/retries.ui.spec.js

@@ -34,6 +34,7 @@ describe('runner/cypress retries.ui.spec', { viewportWidth: 600, viewportHeight:
     })
     .then(shouldHaveTestResults(2, 0))
 
+    cy.get('.test').should('have.length', 2)
     cy.percySnapshot()
   })
 

packages/runner/cypress/integration/runner.ui.spec.js

@@ -341,5 +341,25 @@ describe('src/cypress/runner', () => {
         },
       })
     })
+
+    it('supports disabling command log reporter with env var NO_COMMAND_LOG', () => {
+      runIsolatedCypress(() => {
+        it('foo', () => {
+          // simulate a page load, ensures reporter state event is properly stubbed
+          cy.then(() => Cypress.action('cy:collect:run:state'))
+          cy.visit('/')
+
+          // ensures runner doesn't wait for nonexist before:screenshot ack
+          cy.screenshot({
+            capture: 'runner',
+          })
+        })
+      },
+      {
+        config: { env: { NO_COMMAND_LOG: '1' } },
+      })
+
+      cy.get('.reporter').should('not.exist')
+    })
   })
 })

packages/runner/src/app/app.jsx

@@ -26,6 +26,8 @@ class App extends Component {
      */
     const spec = this.props.config.spec
 
+    const NO_COMMAND_LOG = this.props.config.env && this.props.config.env.NO_COMMAND_LOG
+
     return (
       <div className={cs({
         'is-reporter-resizing': this.isReporterResizing,
@@ -36,13 +38,13 @@ class App extends Component {
           className='reporter-wrap'
           style={{ width: this.props.state.reporterWidth }}
         >
-          <Reporter
+          {Boolean(NO_COMMAND_LOG) || <Reporter
             runner={this.props.eventManager.reporterBus}
             spec={spec}
             autoScrollingEnabled={this.props.config.state.autoScrollingEnabled}
             error={errorMessages.reporterError(this.props.state.scriptError, spec.relative)}
             firefoxGcInterval={this.props.config.firefoxGcInterval}
-          />
+          />}
         </div>
         <div
           ref='container'

packages/runner/src/lib/event-manager.js

@@ -292,6 +292,10 @@ const eventManager = {
     })
 
     Cypress.on('collect:run:state', () => {
+      if (Cypress.env('NO_COMMAND_LOG')) {
+        return Promise.resolve()
+      }
+
       return new Promise((resolve) => {
         reporterBus.emit('reporter:collect:run:state', resolve)
       })
@@ -315,6 +319,10 @@ const eventManager = {
         cb()
       }
 
+      if (Cypress.env('NO_COMMAND_LOG')) {
+        return beforeThenCb()
+      }
+
       const wait = !config.appOnly && config.waitForCommandSynchronization
 
       if (!config.appOnly) {

packages/runner/src/main.jsx

@@ -16,7 +16,9 @@ const Runner = {
     action('started', () => {
       const config = JSON.parse(driverUtils.decodeBase64Unicode(base64Config))
 
-      const state = new State((config.state || {}).reporterWidth)
+      const NO_COMMAND_LOG = config.env && config.env.NO_COMMAND_LOG
+
+      const state = new State(NO_COMMAND_LOG ? 0 : (config.state || {}).reporterWidth)
 
       Runner.state = state
       Runner.configureMobx = configure