fix(build): make outDir from cli work properly

closes #2716

docs/reference/cli.md

@@ -17,7 +17,7 @@ vitepress dev [root]
 ### Options
 
 | Option          | Description                                                       |
-| -      | -           |
+| --------------- | ----------------------------------------------------------------- |
 | `--open [path]` | Open browser on startup (`boolean \| string`)                     |
 | `--port <port>` | Specify port (`number`)                                           |
 | `--base <path>` | Public base path (default: `/`) (`string`)                        |
@@ -38,11 +38,11 @@ vitepress build [root]
 ### Options
 
 | Option                         | Description                                                                                                         |
-| -      | -           |
+| ------------------------------ | ------------------------------------------------------------------------------------------------------------------- |
 | `--mpa` (experimental)         | Build in [MPA mode](../guide/mpa-mode) without client-side hydration (`boolean`)                                    |
 | `--base <path>`                | Public base path (default: `/`) (`string`)                                                                          |
 | `--target <target>`            | Transpile target (default: `"modules"`) (`string`)                                                                  |
-| `--outDir <dir>`          | Output directory (default: `.vitepress/dist`) (`string`) |
+| `--outDir <dir>`               | Output directory relative to **cwd** (default: `<root>/.vitepress/dist`) (`string`)                                 |
 | `--minify [minifier]`          | Enable/disable minification, or specify minifier to use (default: `"esbuild"`) (`boolean \| "terser" \| "esbuild"`) |
 | `--assetsInlineLimit <number>` | Static asset base64 inline threshold in bytes (default: `4096`) (`number`)                                          |
 
@@ -59,7 +59,7 @@ vitepress preview [root]
 ### Options
 
 | Option          | Description                                |
-| -      | -           |
+| --------------- | ------------------------------------------ |
 | `--base <path>` | Public base path (default: `/`) (`string`) |
 | `--port <port>` | Specify port (`number`)                    |
 

src/node/build/build.ts

@@ -35,6 +35,11 @@ export async function build(
     delete buildOptions.mpa
   }
 
+  if (buildOptions.outDir) {
+    siteConfig.outDir = path.resolve(process.cwd(), buildOptions.outDir)
+    delete buildOptions.outDir
+  }
+
   try {
     const { clientResult, serverResult, pageToHashMap } = await bundle(
       siteConfig,

src/node/build/bundle.ts

@@ -76,7 +76,7 @@ export async function bundle(
         : typeof options.minify === 'boolean'
         ? options.minify
         : !process.env.DEBUG,
-      outDir: ssr ? config.tempDir : options.outDir || config.outDir,
+      outDir: ssr ? config.tempDir : config.outDir,
       cssCodeSplit: false,
       rollupOptions: {
         ...rollupOptions,