feat(vitest): support clearScreen cli flag

docs/guide/cli.md

@@ -103,6 +103,7 @@ Run only [benchmark](https://vitest.dev/guide/features.html#benchmarking-experim
 | `--exclude <glob>` | Additional file globs to be excluded from test |
 | `--expand-snapshot-diff` | Show full diff when snapshot fails |
 | `--disable-console-intercept` | Disable automatic interception of console logging (default: `false`) |
+| `--clearScreen` | Clear terminal screen when re-running tests during watch mode (default: `true`) |
 | `--typecheck [options]` | Custom options for typecheck pool. If passed without options, enables typechecking |
 | `--typecheck.enabled` | Enable typechecking alongside tests (default: `false`) |
 | `--typecheck.only` | Run only typecheck tests. This automatically enables typecheck (default: `false`) |

packages/vitest/src/node/cli/cli-config.ts

@@ -570,6 +570,9 @@ export const cliOptionsConfig: VitestCLIOptions = {
     description: 'Removes colors from the console output',
     alias: 'no-color',
   },
+  clearScreen: {
+    description: 'Clear terminal screen when re-running tests during watch mode (default: true)',
+  },
 
   // disable CLI options
   cliExclude: null,

packages/vitest/src/node/config.ts

@@ -94,6 +94,8 @@ export function resolveConfig(
   if (viteConfig.base !== '/')
     resolved.base = viteConfig.base
 
+  resolved.clearScreen = resolved.clearScreen ?? viteConfig.clearScreen ?? true
+
   if (options.shard) {
     if (resolved.watch)
       throw new Error('You cannot use --shard option with enabled watch')

packages/vitest/src/node/logger.ts

@@ -54,7 +54,7 @@ export class Logger {
   }
 
   clearFullScreen(message: string) {
-    if (this.ctx.server.config.clearScreen === false) {
+    if (!this.ctx.config.clearScreen) {
       this.console.log(message)
       return
     }
@@ -63,7 +63,7 @@ export class Logger {
   }
 
   clearScreen(message: string, force = false) {
-    if (this.ctx.server.config.clearScreen === false) {
+    if (!this.ctx.config.clearScreen) {
       this.console.log(message)
       return
     }

packages/vitest/src/types/config.ts

@@ -797,6 +797,11 @@ export interface UserConfig extends InlineConfig {
    * Additional exclude patterns
    */
   cliExclude?: string[]
+
+  /**
+   * Override vite config's clearScreen from cli
+   */
+  clearScreen?: boolean
 }
 
 export interface ResolvedConfig extends Omit<Required<UserConfig>, 'config' | 'filters' | 'browser' | 'coverage' | 'testNamePattern' | 'related' | 'api' | 'reporters' | 'resolveSnapshotPath' | 'benchmark' | 'shard' | 'cache' | 'sequence' | 'typecheck' | 'runner' | 'poolOptions' | 'pool' | 'cliExclude'> {

test/core/test/cli-test.test.ts

@@ -1,4 +1,6 @@
 import { expect, test } from 'vitest'
+import { resolveConfig as viteResolveConfig } from 'vite'
+import { resolveConfig } from '../../../packages/vitest/src/node/config.js'
 import { createCLI, parseCLI } from '../../../packages/vitest/src/node/cli/cac.js'
 
 const vitestCli = createCLI()
@@ -254,6 +256,44 @@ test('browser by name', () => {
   expect(options).toEqual({ browser: { enabled: true, name: 'firefox' } })
 })
 
+test('clearScreen', async () => {
+  const examples = [
+    // vitest cli | vite clearScreen
+    ['--clearScreen', undefined],
+    ['--clearScreen', true],
+    ['--clearScreen', false],
+    ['--no-clearScreen', undefined],
+    ['--no-clearScreen', true],
+    ['--no-clearScreen', false],
+    ['', undefined],
+    ['', true],
+    ['', false],
+  ] as const
+  const baseViteConfig = await viteResolveConfig({ configFile: false }, 'serve')
+  const results = examples.map(([vitestClearScreen, viteClearScreen]) => {
+    const viteConfig = {
+      ...baseViteConfig,
+      clearScreen: viteClearScreen,
+    }
+    const vitestConfig = getCLIOptions(vitestClearScreen)
+    const config = resolveConfig('test', vitestConfig, viteConfig)
+    return config.clearScreen
+  })
+  expect(results).toMatchInlineSnapshot(`
+    [
+      true,
+      true,
+      true,
+      false,
+      false,
+      false,
+      true,
+      true,
+      false,
+    ]
+  `)
+})
+
 test('public parseCLI works correctly', () => {
   expect(parseCLI('vitest dev')).toEqual({
     filter: [],