Upgrade jest-worker

jest.config.js

@@ -1,6 +1,4 @@
 module.exports = {
-  // this will become default in jest 27:
-  testRunner: 'jest-circus/runner',
   testMatch: ['**/*.test.js'],
   verbose: true,
   rootDir: 'test',

package.json

@@ -59,7 +59,7 @@
     "async-sema": "3.0.1",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "10.0.3",
-    "babel-jest": "24.9.0",
+    "babel-jest": "27.0.0-next.5",
     "browserslist": "^4.14.7",
     "browserstack-local": "1.4.0",
     "cheerio": "0.22.0",
@@ -87,8 +87,7 @@
     "image-size": "0.9.3",
     "is-animated": "2.0.0",
     "isomorphic-unfetch": "3.0.0",
-    "jest-circus": "26.0.1",
-    "jest-cli": "24.9.0",
+    "jest-cli": "27.0.0-next.5",
     "ky": "0.19.1",
     "ky-universal": "0.6.0",
     "lerna": "4.0.0",

packages/next/build/index.ts

@@ -2,7 +2,7 @@ import { loadEnvConfig } from '@next/env'
 import chalk from 'chalk'
 import crypto from 'crypto'
 import { promises, writeFileSync } from 'fs'
-import Worker from 'jest-worker'
+import { Worker } from 'jest-worker'
 import devalue from 'next/dist/compiled/devalue'
 import escapeStringRegexp from 'next/dist/compiled/escape-string-regexp'
 import findUp from 'next/dist/compiled/find-up'

packages/next/build/webpack/plugins/terser-webpack-plugin/src/index.js

@@ -7,7 +7,7 @@ import {
   sources,
 } from 'next/dist/compiled/webpack/webpack'
 import pLimit from 'p-limit'
-import jestWorker from 'jest-worker'
+import { Worker } from 'jest-worker'
 import crypto from 'crypto'
 import cacache from 'next/dist/compiled/cacache'
 import { spans } from '../../profiling-plugin'
@@ -192,13 +192,10 @@ class TerserPlugin {
           return initializedWorker
         }
 
-        initializedWorker = new jestWorker(
-          path.join(__dirname, './minify.js'),
-          {
-            numWorkers: numberOfWorkers,
-            enableWorkerThreads: true,
-          }
-        )
+        initializedWorker = new Worker(path.join(__dirname, './minify.js'), {
+          numWorkers: numberOfWorkers,
+          enableWorkerThreads: true,
+        })
 
         initializedWorker.getStdout().pipe(process.stdout)
         initializedWorker.getStderr().pipe(process.stderr)