Detect Invalid Pages Before Optimize

packages/next/build/index.ts

@@ -1,5 +1,6 @@
 import chalk from 'chalk'
 import ciEnvironment from 'ci-info'
+import escapeStringRegexp from 'escape-string-regexp'
 import findUp from 'find-up'
 import fs from 'fs'
 import Worker from 'jest-worker'
@@ -11,14 +12,14 @@ import { promisify } from 'util'
 import formatWebpackMessages from '../client/dev/error-overlay/format-webpack-messages'
 import checkCustomRoutes, {
   getRedirectStatus,
-  RouteType,
+  Header,
   Redirect,
   Rewrite,
-  Header,
+  RouteType,
 } from '../lib/check-custom-routes'
 import {
-  PUBLIC_DIR_MIDDLEWARE_CONFLICT,
   PAGES_404_GET_INITIAL_PROPS_ERROR,
+  PUBLIC_DIR_MIDDLEWARE_CONFLICT,
 } from '../lib/constants'
 import { findPagesDir } from '../lib/find-pages-dir'
 import { recursiveDelete } from '../lib/recursive-delete'
@@ -44,7 +45,7 @@ import loadConfig, {
   isTargetLikeServerless,
 } from '../next-server/server/config'
 import {
-  eventBuildDuration,
+  eventBuildCompleted,
   eventBuildOptimize,
   eventNextPlugins,
   eventVersion,
@@ -56,17 +57,16 @@ import { generateBuildId } from './generate-build-id'
 import { isWriteable } from './is-writeable'
 import createSpinner from './spinner'
 import {
-  isPageStatic,
   collectPages,
   getPageSizeInKb,
   hasCustomAppGetInitialProps,
+  isPageStatic,
   PageInfo,
   printCustomRoutes,
   printTreeView,
 } from './utils'
 import getBaseWebpackConfig from './webpack-config'
 import { writeBuildId } from './write-build-id'
-import escapeStringRegexp from 'escape-string-regexp'
 
 const fsAccess = promisify(fs.access)
 const fsUnlink = promisify(fs.unlink)
@@ -394,8 +394,7 @@ export default async function build(dir: string, conf = null): Promise<void> {
   } else {
     console.log(chalk.green('Compiled successfully.\n'))
     telemetry.record(
-      eventBuildDuration({
-        totalPageCount: pagePaths.length,
+      eventBuildCompleted(pagePaths, {
         durationInSeconds: webpackBuildEnd[0],
       })
     )

packages/next/telemetry/events/build.ts

@@ -1,15 +1,34 @@
+const REGEXP_DIRECTORY_DUNDER = /[\\/]__[^\\/]+(?<![\\/]__(?:tests|mocks))__[\\/]/i
+const REGEXP_DIRECTORY_TESTS = /[\\/]__(tests|mocks)__[\\/]/i
+const REGEXP_FILE_TEST = /\.(?:spec|test)\.[^.]+$/i
+
 const EVENT_BUILD_DURATION = 'NEXT_BUILD_COMPLETED'
 type EventBuildCompleted = {
   durationInSeconds: number
   totalPageCount: number
+  hasDunderPages: boolean
+  hasTestPages: boolean
 }
 
-export function eventBuildDuration(
-  event: EventBuildCompleted
+export function eventBuildCompleted(
+  pagePaths: string[],
+  event: Omit<
+    EventBuildCompleted,
+    'totalPageCount' | 'hasDunderPages' | 'hasTestPages'
+  >
 ): { eventName: string; payload: EventBuildCompleted } {
   return {
     eventName: EVENT_BUILD_DURATION,
-    payload: event,
+    payload: {
+      ...event,
+      totalPageCount: pagePaths.length,
+      hasDunderPages: pagePaths.some(path =>
+        REGEXP_DIRECTORY_DUNDER.test(path)
+      ),
+      hasTestPages: pagePaths.some(
+        path => REGEXP_DIRECTORY_TESTS.test(path) || REGEXP_FILE_TEST.test(path)
+      ),
+    },
   }
 }
 
@@ -23,10 +42,6 @@ type EventBuildOptimized = {
   hasTestPages: boolean
 }
 
-const REGEXP_DIRECTORY_DUNDER = /[\\/]__[^\\/]+(?<![\\/]__(?:tests|mocks))__[\\/]/i
-const REGEXP_DIRECTORY_TESTS = /[\\/]__(tests|mocks)__[\\/]/i
-const REGEXP_FILE_TEST = /\.(?:spec|test)\.[^.]+$/i
-
 export function eventBuildOptimize(
   pagePaths: string[],
   event: Omit<

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

@@ -108,8 +108,13 @@ describe('Telemetry CLI', () => {
       path.join(appDir, 'pages', 'hello.test.skip')
     )
 
-    expect(stderr).toMatch(/hasDunderPages.*?true/)
-    expect(stderr).toMatch(/hasTestPages.*?true/)
+    const event1 = /NEXT_BUILD_COMPLETED[\s\S]+?{([\s\S]+?)}/.exec(stderr).pop()
+    expect(event1).toMatch(/hasDunderPages.*?true/)
+    expect(event1).toMatch(/hasTestPages.*?true/)
+
+    const event2 = /NEXT_BUILD_OPTIMIZED[\s\S]+?{([\s\S]+?)}/.exec(stderr).pop()
+    expect(event2).toMatch(/hasDunderPages.*?true/)
+    expect(event2).toMatch(/hasTestPages.*?true/)
   })
 
   it('detects isSrcDir dir correctly for `next dev`', async () => {