vercel · sokra · Feb 25, 2026 · Feb 25, 2026 · Feb 25, 2026 · Feb 25, 2026
diff --git a/packages/next/errors.json b/packages/next/errors.json
@@ -263,7 +263,7 @@
   "262": "%s %s",
   "263": "Invariant: static generation store missing in %s",
   "264": "Failed to find Server Action \"%s\". This request might be from an older or newer deployment. %s\\nRead more: https://nextjs.org/docs/messages/failed-to-find-server-action",
-  "265": "Farm is ended, no more calls can be done to it",
+  "265": "Worker is ended, no more calls can be done to it",
   "266": "Multiple children were passed to <Link> with \\`href\\` of \\`%s\\` but only one child is supported https://nextjs.org/docs/messages/link-multiple-children%s",
   "267": "Dynamic href \\`%s\\` found in <Link> while using the \\`/app\\` router, this is not supported. Read more: https://nextjs.org/docs/messages/app-dir-dynamic-href",
   "268": "Failed to prefetch: %s",
@@ -1073,5 +1073,19 @@
   "1072": "Missing segment data: <head>",
   "1073": "Expected static stage body to be available",
   "1074": "Page \"%s\" cannot use both \"use client\" and export const \"unstable_instant\".",
-  "1075": "Page \"%s\" cannot export \"unstable_instant\" from a Client Component module. To use this API, convert this module to a Server Component by removing the \"use client\" directive."
+  "1075": "Page \"%s\" cannot export \"unstable_instant\" from a Client Component module. To use this API, convert this module to a Server Component by removing the \"use client\" directive.",
+  "1076": "Worker pool is ending, no more calls can be made",
+  "1077": "Worker exited with code %s%s",
+  "1078": "This file must be run as a worker thread",
+  "1079": "Worker pool closed",
+  "1080": "Child can only be used on a forked process",
+  "1081": "Error when calling setup: %s",
+  "1082": "Worker pool ended before task could be processed",
+  "1083": "\"null\" or \"undefined\" thrown",
+  "1084": "Unexpected request from parent process: %s",
+  "1085": "Worker exited unexpectedly with code %s, signal %s",
+  "1086": "Worker restarted due to timeout",
+  "1087": "maxBootingWorkers must be at least 1",
+  "1088": "Worker exited during shutdown",
+  "1089": "Worker pool ended while requests were in-flight"
 }
diff --git a/packages/next/src/build/collect-build-traces.ts b/packages/next/src/build/collect-build-traces.ts
@@ -218,7 +218,7 @@ export async function collectBuildTraces({
 
       const sharedIgnores = [
         '**/next/dist/compiled/next-server/**/*.dev.js',
-        ...(isStandalone ? [] : ['**/next/dist/compiled/jest-worker/**/*']),
+        ...(isStandalone ? [] : ['**/next/dist/lib/worker/worker-*-child*']),
         '**/next/dist/compiled/webpack/*',
         '**/node_modules/webpack5/**/*',
         '**/next/dist/server/lib/route-resolver*',
@@ -281,12 +281,12 @@ export async function collectBuildTraces({
       if (isStandalone) {
         addToTracedFiles(
           '',
-          require.resolve('next/dist/compiled/jest-worker/processChild'),
+          require.resolve('../lib/worker/worker-process-child'),
           serverTracedFiles
         )
         addToTracedFiles(
           '',
-          require.resolve('next/dist/compiled/jest-worker/threadChild'),
+          require.resolve('../lib/worker/worker-thread-child'),
           serverTracedFiles
         )
       }

diff --git a/packages/next/src/build/index.ts b/packages/next/src/build/index.ts
@@ -834,8 +834,9 @@ export function createStaticWorker(
 ): StaticWorker {
   const { numberOfWorkers, debuggerPortOffset, progress } = options
   return new Worker(staticWorkerPath, {
+    workerName: 'Next.js static worker',
     logger: Log,
-    numWorkers: numberOfWorkers,
+    maxWorkers: numberOfWorkers,
     onActivity: () => {
       progress?.run()
     },
@@ -1647,9 +1648,8 @@ export default async function build(
                 const buildTraceWorker = new Worker(
                   require.resolve('./collect-build-traces'),
                   {
-                    debuggerPortOffset: -1,
-                    isolatedMemory: false,
-                    numWorkers: 1,
+                    workerName: 'Next.js build trace worker',
+                    maxWorkers: 1,
                     exposedMethods: ['collectBuildTraces'],
                     forkOptions: process.env.NEXT_CPU_PROF
                       ? {

diff --git a/packages/next/src/build/turbopack-build/index.ts b/packages/next/src/build/turbopack-build/index.ts
@@ -8,11 +8,10 @@ async function turbopackBuildWithWorker(): ReturnType<
 > {
   try {
     const worker = new Worker(path.join(__dirname, 'impl.js'), {
+      workerName: 'Next.js turbopack build worker',
       exposedMethods: ['workerMain', 'waitForShutdown'],
       enableWorkerThreads: true,
-      debuggerPortOffset: -1,
-      isolatedMemory: false,
-      numWorkers: 1,
+      maxWorkers: 1,
       maxRetries: 0,
       forkOptions: {
         env: {

diff --git a/packages/next/src/build/type-check.ts b/packages/next/src/build/type-check.ts
@@ -6,7 +6,7 @@ import * as Log from './output/log'
 import { Worker } from '../lib/worker'
 import createSpinner from './spinner'
 import { eventTypeCheckCompleted } from '../telemetry/events'
-import isError from '../lib/is-error'
+
 import { hrtimeDurationToString } from './duration-to-string'
 
 /**
@@ -43,10 +43,9 @@ function verifyAndRunTypeScript(
     typeCheckWorker = new Worker(
       require.resolve('../lib/verify-typescript-setup'),
       {
+        workerName: 'Next.js type check worker',
         exposedMethods: ['verifyAndRunTypeScript'],
-        debuggerPortOffset: -1,
-        isolatedMemory: false,
-        numWorkers: 1,
+        maxWorkers: 1,
         enableWorkerThreads,
         maxRetries: 0,
       }
@@ -124,57 +123,47 @@ export async function startTypeChecking({
 
   const typeCheckAndLintStart = process.hrtime()
 
-  try {
-    const [verifyResult, typeCheckEnd] = await nextBuildSpan
-      .traceChild('run-typescript')
-      .traceAsyncFn(() =>
-        verifyAndRunTypeScript(
-          dir,
-          config.distDir,
-          Boolean(config.experimental.strictRouteTypes),
-          !ignoreTypeScriptErrors,
-          config.typescript.tsconfigPath,
-          Boolean(config.typedRoutes),
-          config.images.disableStaticImages,
-          cacheDir,
-          config.experimental.workerThreads,
-          !!appDir,
-          !!pagesDir,
-          appDir,
-          pagesDir,
-          debugBuildPaths
-        ).then((resolved) => {
-          const checkEnd = process.hrtime(typeCheckAndLintStart)
-          return [resolved, checkEnd] as const
-        })
-      )
+  const [verifyResult, typeCheckEnd] = await nextBuildSpan
+    .traceChild('run-typescript')
+    .traceAsyncFn(() =>
+      verifyAndRunTypeScript(
+        dir,
+        config.distDir,
+        Boolean(config.experimental.strictRouteTypes),
+        !ignoreTypeScriptErrors,
+        config.typescript.tsconfigPath,
+        Boolean(config.typedRoutes),
+        config.images.disableStaticImages,
+        cacheDir,
+        config.experimental.workerThreads,
+        !!appDir,
+        !!pagesDir,
+        appDir,
+        pagesDir,
+        debugBuildPaths
+      ).then((resolved) => {
+        const checkEnd = process.hrtime(typeCheckAndLintStart)
+        return [resolved, checkEnd] as const
+      })
+    )
 
-    if (typeCheckingSpinner) {
-      typeCheckingSpinner.stop()
-    }
+  if (typeCheckingSpinner) {
+    typeCheckingSpinner.stop()
+  }
 
-    createSpinner(
-      `Finished TypeScript${ignoreTypeScriptErrors ? ' config validation' : ''} in ${hrtimeDurationToString(typeCheckEnd)}`
-    )?.stopAndPersist()
+  createSpinner(
+    `Finished TypeScript${ignoreTypeScriptErrors ? ' config validation' : ''} in ${hrtimeDurationToString(typeCheckEnd)}`
+  )?.stopAndPersist()
 
-    if (!ignoreTypeScriptErrors && verifyResult) {
-      telemetry.record(
-        eventTypeCheckCompleted({
-          durationInSeconds: typeCheckEnd[0],
-          typescriptVersion: verifyResult.version,
-          inputFilesCount: verifyResult.result?.inputFilesCount,
-          totalFilesCount: verifyResult.result?.totalFilesCount,
-          incremental: verifyResult.result?.incremental,
-        })
-      )
-    }
-  } catch (err) {
-    // prevent showing jest-worker internal error as it
-    // isn't helpful for users and clutters output
-    if (isError(err) && err.message === 'Call retries were exceeded') {
-      await telemetry.flush()
-      process.exit(1)
-    }
-    throw err
+  if (!ignoreTypeScriptErrors && verifyResult) {
+    telemetry.record(
+      eventTypeCheckCompleted({
+        durationInSeconds: typeCheckEnd[0],
+        typescriptVersion: verifyResult.version,
+        inputFilesCount: verifyResult.result?.inputFilesCount,
+        totalFilesCount: verifyResult.result?.totalFilesCount,
+        incremental: verifyResult.result?.incremental,
+      })
+    )
   }
 }
diff --git a/packages/next/src/build/webpack-build/index.ts b/packages/next/src/build/webpack-build/index.ts
@@ -46,10 +46,9 @@ async function webpackBuildWithWorker(
 
   for (const compilerName of compilerNames) {
     const worker = new Worker(path.join(__dirname, 'impl.js'), {
+      workerName: `Next.js webpack worker (${compilerName})`,
       exposedMethods: ['workerMain'],
-      debuggerPortOffset: -1,
-      isolatedMemory: false,
-      numWorkers: 1,
+      maxWorkers: 1,
       maxRetries: 0,
       forkOptions: {
         env: {

diff --git a/packages/next/src/compiled/jest-worker/LICENSE b/packages/next/src/compiled/jest-worker/LICENSE
diff --git a/packages/next/src/compiled/jest-worker/index.js b/packages/next/src/compiled/jest-worker/index.js
diff --git a/packages/next/src/compiled/jest-worker/package.json b/packages/next/src/compiled/jest-worker/package.json
diff --git a/packages/next/src/compiled/jest-worker/processChild.js b/packages/next/src/compiled/jest-worker/processChild.js
diff --git a/packages/next/src/compiled/jest-worker/threadChild.js b/packages/next/src/compiled/jest-worker/threadChild.js