chore: remove auto enable

Author: webfansplz

docs/config/shared-options.md

@@ -515,7 +515,7 @@ Learn more in Vite's [SSR guide](/guide/ssr#vite-cli). Related: [`server.middlew
 
 - **Experimental:** [Give Feedback](https://github.com/vitejs/devtools/discussions)
 - **Type:** `boolean` | `DevToolsConfig`
-- **Default:** `false` (`true` if `@vitejs/devtools` is installed)
+- **Default:** `false`
 
 Enable devtools integration for visualizing the internal state and build analysis.
 Ensure that `@vitejs/devtools` is installed as a dependency. This feature is currently supported only in build mode.

packages/vite/src/node/config.ts

@@ -85,7 +85,6 @@ import {
   isNodeLikeBuiltin,
   isObject,
   isParentDirectory,
-  isPkgInstalled,
   mergeAlias,
   mergeConfig,
   mergeWithDefaults,
@@ -513,8 +512,8 @@ export interface UserConfig extends DefaultEnvironmentOptions {
   /**
    * Enable devtools integration. Ensure that `@vitejs/devtools` is installed as a dependency.
    * This feature is currently supported only in build mode.
-   * Defaults to true, if `@vitejs/devtools` is installed.
    * @experimental
+   * @default false
    */
   devtools?: boolean | DevToolsConfig
 }
@@ -748,14 +747,11 @@ export async function resolveDevToolsConfig(
 }> {
   const resolvedHostname = await resolveHostname(config.server?.host)
   const fallbackHostname = resolvedHostname.host ?? 'localhost'
-  const isEnabled =
-    config.devtools === true || !!(config.devtools && config.devtools.enabled)
 
   return {
     enabled:
-      config.devtools === false
-        ? false
-        : isEnabled || isPkgInstalled('@vitejs/devtools/cli-commands'),
+      config.devtools === true ||
+      !!(config.devtools && config.devtools.enabled),
     config: {
       ...(isObject(config.devtools) ? config.devtools : {}),
       host: isObject(config.devtools)

packages/vite/src/node/utils.ts

@@ -1774,11 +1774,3 @@ export function monotonicDateNow(): number {
   lastDateNow++
   return lastDateNow
 }
-
-export function isPkgInstalled(moduleName: string): boolean {
-  try {
-    import.meta.resolve(moduleName)
-    return true
-  } catch {}
-  return false
-}

playground/devtools/vite.config.ts

@@ -3,7 +3,7 @@ import { defineConfig } from 'vite'
 export default defineConfig({
   base: '/',
   devtools: {
-    enabled: true,
+    enabled: false,
     port: 5173,
   },
 })