feat: disable colors if agent is detected

packages/vitest/src/node/config/serializeConfig.ts

@@ -1,6 +1,7 @@
 import type { TestProject } from '../project'
 import type { ApiConfig, SerializedConfig } from '../types/config'
 import { configDefaults } from '../../defaults'
+import { isAgent } from '../../utils/env'
 
 export function serializeConfig(project: TestProject): SerializedConfig {
   const { config, globalConfig } = project
@@ -146,5 +147,6 @@ export function serializeConfig(project: TestProject): SerializedConfig {
       config.slowTestThreshold
       ?? globalConfig.slowTestThreshold
       ?? configDefaults.slowTestThreshold,
+    isAgent,
   }
 }

packages/vitest/src/node/core.ts

@@ -52,6 +52,8 @@
 import { populateProjectsTags } from './tags'
 import { TestRun } from './test-run'
 import { VitestWatcher } from './watcher'
+import { disableDefaultColors } from 'tinyrainbow'
+import { isAgent } from '../utils/env'
 
 const WATCHER_DEBOUNCE = 100
 
@@ -137,6 +139,10 @@
     cliOptions: UserConfig,
     options: VitestOptions = {},
   ) {
+    if (isAgent) {
+      disableDefaultColors()
+    }
+
     this._cliOptions = cliOptions
     this.logger = new Logger(this, options.stdout, options.stderr)
     this.packageInstaller = options.packageInstaller || new VitestPackageInstaller()

packages/vitest/src/runtime/config.ts

@@ -146,6 +146,7 @@ export interface SerializedConfig {
   tagsFilter: string[] | undefined
   strictTags: boolean
   slowTestThreshold: number | undefined
+  isAgent: boolean
 }
 
 export interface SerializedCoverageConfig {

packages/vitest/src/runtime/workers/init.ts

@@ -7,6 +7,7 @@
 import * as listeners from '../listeners'
 import { createRuntimeRpc } from '../rpc'
 import * as entrypoint from '../worker'
+import { disableDefaultColors } from 'tinyrainbow'
 
 interface Options extends VitestWorker {
   teardown?: () => void
@@ -49,6 +50,10 @@
         process.env.VITEST_WORKER_ID = String(message.workerId)
         reportMemory = message.options.reportMemory
 
+        if (message.context.config.isAgent) {
+          disableDefaultColors()
+        }
+
         traces ??= await new Traces({
           enabled: message.traces.enabled,
           sdkPath: message.traces.sdkPath,

pnpm-workspace.yaml

@@ -83,7 +83,7 @@ catalog:
   tinyexec: ^1.0.2
   tinyglobby: ^0.2.15
   tinyhighlight: ^0.3.2
-  tinyrainbow: ^3.0.3
+  tinyrainbow: ^3.1.0
   tinyspy: ^4.0.4
   typescript: ^5.9.3
   unocss: ^66.6.6