feat(build): support cacheDir (#1355)

Author: shigma

docs/config/app-configs.md

@@ -198,6 +198,19 @@ export default {
 }
 ```
 
+## cacheDir
+
+- Type: `string`
+- Default: `./.vitepress/cache`
+
+The directory for cache files, relative to project root (`docs` folder if you're running `vitepress build docs`). See also: [cacheDir](https://vitejs.dev/config/shared-options.html#cachedir).
+
+```ts
+export default {
+  outDir: './.vitepress/.vite'
+}
+```
+
 ## srcDir
 
 - Type: `string`

src/node/build/buildMPAClient.ts

@@ -14,6 +14,7 @@ export async function buildMPAClient(
 
   return build({
     root: config.srcDir,
+    cacheDir: config.cacheDir,
     base: config.site.base,
     logLevel: 'warn',
     build: {

src/node/build/bundle.ts

@@ -41,6 +41,7 @@ export async function bundle(
 
   const resolveViteConfig = async (ssr: boolean): Promise<ViteUserConfig> => ({
     root: config.srcDir,
+    cacheDir: config.cacheDir,
     base: config.site.base,
     logLevel: 'warn',
     plugins: await createVitePressPlugin(

src/node/config.ts

@@ -53,6 +53,7 @@ export interface UserConfig<ThemeConfig = any> {
   srcDir?: string
   srcExclude?: string[]
   outDir?: string
+  cacheDir?: string
   shouldPreload?: (link: string, page: string) => boolean
 
   /**
@@ -165,6 +166,7 @@ export interface SiteConfig<ThemeConfig = any>
   configDeps: string[]
   themeDir: string
   outDir: string
+  cacheDir: string
   tempDir: string
   pages: string[]
 }
@@ -203,6 +205,9 @@ export async function resolveConfig(
   const outDir = userConfig.outDir
     ? path.resolve(root, userConfig.outDir)
     : resolve(root, 'dist')
+  const cacheDir = userConfig.cacheDir
+    ? path.resolve(root, userConfig.cacheDir)
+    : resolve(root, 'cache')
 
   // resolve theme path
   const userThemeDir = resolve(root, 'theme')
@@ -232,6 +237,7 @@ export async function resolveConfig(
     configPath,
     configDeps,
     outDir,
+    cacheDir,
     tempDir: resolve(root, '.temp'),
     markdown: userConfig.markdown,
     lastUpdated: userConfig.lastUpdated,

src/node/server.ts

@@ -20,6 +20,7 @@ export async function createServer(
   return createViteServer({
     root: config.srcDir,
     base: config.site.base,
+    cacheDir: config.cacheDir,
     // logLevel: 'warn',
     plugins: await createVitePressPlugin(config, false, {}, {}, recreateServer),
     server: serverOptions