Record src directory usage with version

packages/next/build/index.ts

@@ -122,7 +122,12 @@ export default async function build(dir: string, conf = null): Promise<void> {
 
   let backgroundWork: (Promise<any> | undefined)[] = []
   backgroundWork.push(
-    telemetry.record(eventVersion({ cliCommand: 'build' })),
+    telemetry.record(
+      eventVersion({
+        cliCommand: 'build',
+        isSrcDir: path.relative(dir, pagesDir!).startsWith('src'),
+      })
+    ),
     eventNextPlugins(path.resolve(dir)).then(events => telemetry.record(events))
   )
 

packages/next/export/index.ts

@@ -95,7 +95,7 @@ export default async function(
   const distDir = join(dir, nextConfig.distDir)
   if (!options.buildExport) {
     const telemetry = new Telemetry({ distDir })
-    telemetry.record(eventVersion({ cliCommand: 'export' }))
+    telemetry.record(eventVersion({ cliCommand: 'export', isSrcDir: null }))
   }
 
   const subFolders = nextConfig.exportTrailingSlash

packages/next/server/next-dev-server.ts

@@ -207,7 +207,12 @@ export default class DevServer extends Server {
     this.setDevReady!()
 
     const telemetry = new Telemetry({ distDir: this.distDir })
-    telemetry.record(eventVersion({ cliCommand: 'dev' }))
+    telemetry.record(
+      eventVersion({
+        cliCommand: 'dev',
+        isSrcDir: relative(this.dir, this.pagesDir!).startsWith('src'),
+      })
+    )
   }
 
   protected async close() {

packages/next/telemetry/events/version.ts

@@ -4,6 +4,7 @@ type EventCliSessionStarted = {
   nextVersion: string
   nodeVersion: string
   cliCommand: string
+  isSrcDir: boolean | null
 }
 
 export function eventVersion(
@@ -21,6 +22,7 @@ export function eventVersion(
         nextVersion: process.env.__NEXT_VERSION,
         nodeVersion: process.version,
         cliCommand: event.cliCommand,
+        isSrcDir: event.isSrcDir,
       } as EventCliSessionStarted,
     },
   ]

test/integration/telemetry/test/index.test.js

@@ -1,9 +1,19 @@
 /* eslint-env jest */
 /* global jasmine */
-import { runNextCommand } from 'next-test-utils'
+import path from 'path'
+import fs from 'fs-extra'
+import {
+  runNextCommand,
+  launchApp,
+  findPort,
+  killApp,
+  waitFor
+} from 'next-test-utils'
 
 jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 2
 
+const appDir = path.join(__dirname, '..')
+
 describe('Telemetry CLI', () => {
   it('can print telemetry status', async () => {
     const { stdout } = await runNextCommand(['telemetry'], {
@@ -59,4 +69,60 @@ describe('Telemetry CLI', () => {
     expect(stdout).toMatch(/already disabled/)
     expect(stdout).toMatch(/Status: Disabled/)
   })
+
+  it('detects isSrcDir dir correctly for `next build`', async () => {
+    const { stderr } = await runNextCommand(['build', appDir], {
+      stderr: true,
+      env: {
+        NEXT_TELEMETRY_DEBUG: 1
+      }
+    })
+
+    expect(stderr).toMatch(/isSrcDir.*?false/)
+
+    await fs.move(path.join(appDir, 'pages'), path.join(appDir, 'src/pages'))
+    const { stderr: stderr2 } = await runNextCommand(['build', appDir], {
+      stderr: true,
+      env: {
+        NEXT_TELEMETRY_DEBUG: 1
+      }
+    })
+    await fs.move(path.join(appDir, 'src/pages'), path.join(appDir, 'pages'))
+
+    expect(stderr2).toMatch(/isSrcDir.*?true/)
+  })
+
+  it('detects isSrcDir dir correctly for `next dev`', async () => {
+    let port = await findPort()
+    let stderr = ''
+
+    const handleStderr = msg => {
+      stderr += msg
+    }
+    let app = await launchApp(appDir, port, {
+      onStderr: handleStderr,
+      env: {
+        NEXT_TELEMETRY_DEBUG: 1
+      }
+    })
+    await waitFor(1000)
+    await killApp(app)
+    expect(stderr).toMatch(/isSrcDir.*?false/)
+
+    await fs.move(path.join(appDir, 'pages'), path.join(appDir, 'src/pages'))
+    stderr = ''
+
+    port = await findPort()
+    app = await launchApp(appDir, port, {
+      onStderr: handleStderr,
+      env: {
+        NEXT_TELEMETRY_DEBUG: 1
+      }
+    })
+    await waitFor(1000)
+    await killApp(app)
+    await fs.move(path.join(appDir, 'src/pages'), path.join(appDir, 'pages'))
+
+    expect(stderr).toMatch(/isSrcDir.*?true/)
+  })
 })