refactor(jest-worker): use colorLevel util

packages/jest-worker/package.json

@@ -19,8 +19,7 @@
   "dependencies": {
     "@types/node": "*",
     "jest-util": "workspace:^",
-    "merge-stream": "^2.0.0",
-    "supports-color": "^8.0.0"
+    "merge-stream": "^2.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.11.6",

packages/jest-worker/src/WorkerPool.ts

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import {stdout as stdoutSupportsColor} from 'supports-color';
+import {colorLevel} from 'jest-util';
 import BaseWorkerPool from './base/BaseWorkerPool';
 import type {
   ChildMessage,
@@ -30,17 +30,13 @@ class WorkerPool extends BaseWorkerPool implements WorkerPoolInterface {
   }
 
   override createWorker(workerOptions: WorkerOptions): WorkerInterface {
-    const JEST_WORKER_COLOR = stdoutSupportsColor
-      ? String(stdoutSupportsColor.level)
-      : '0';
-    const JEST_WORKER_ID = String(workerOptions.workerId + 1); // 0-indexed workerId, 1-indexed JEST_WORKER_ID
     workerOptions = {...workerOptions};
     workerOptions.forkOptions = {...workerOptions.forkOptions};
     workerOptions.forkOptions.env ??= process.env;
     workerOptions.forkOptions.env = {
       ...workerOptions.forkOptions.env,
-      JEST_WORKER_COLOR,
-      JEST_WORKER_ID,
+      JEST_WORKER_COLOR: String(colorLevel.stdout),
+      JEST_WORKER_ID: String(workerOptions.workerId + 1), // 0-indexed workerId, 1-indexed JEST_WORKER_ID
     };
 
     let Worker;

packages/jest-worker/src/workers/__tests__/ChildProcessWorker.test.ts

@@ -8,7 +8,7 @@
 import {EventEmitter} from 'events';
 import {PassThrough} from 'stream';
 import getStream = require('get-stream');
-import * as supportsColor from 'supports-color';
+import {colorLevel} from 'jest-util';
 import {
   CHILD_MESSAGE_CALL,
   CHILD_MESSAGE_INITIALIZE,
@@ -86,9 +86,7 @@ it('passes fork options down to child_process.fork, adding the defaults', () =>
     cwd: '/tmp', // Overridden default option.
     env: {
       ...process.env,
-      JEST_WORKER_COLOR: supportsColor.stdout
-        ? String(supportsColor.stdout.level)
-        : '0',
+      JEST_WORKER_COLOR: String(colorLevel.stdout),
     }, // Default option.
     execArgv: ['-p'], // Filtered option.
     execPath: 'hello', // Added option.

yarn.lock

@@ -12998,7 +12998,6 @@ __metadata:
     jest-leak-detector: "workspace:^"
     jest-util: "workspace:^"
     merge-stream: ^2.0.0
-    supports-color: ^8.0.0
     tsd-lite: ^0.7.0
     worker-farm: ^1.6.0
   languageName: unknown