feat(build): allow setting base from command line

Usage:

```sh
pnpm docs-dev -- --base /foo/
pnpm docs-build-only -- --base /foo/
pnpm docs-serve -- --base /foo/
```

Co-authored-by: Divyansh Singh <40380293+brc-dd@users.noreply.github.com>

src/node/build/build.ts

@@ -9,13 +9,18 @@ import { bundle, okMark, failMark } from './bundle'
 
 export async function build(
   root: string,
-  buildOptions: BuildOptions & { mpa?: string } = {}
+  buildOptions: BuildOptions & { base?:string; mpa?: string } = {}
 ) {
   const start = Date.now()
 
   process.env.NODE_ENV = 'production'
   const siteConfig = await resolveConfig(root, 'build', 'production')
 
+  if (buildOptions.base) {
+    siteConfig.site.base = buildOptions.base
+    delete buildOptions.base
+  }
+
   if (buildOptions.mpa) {
     siteConfig.mpa = true
     delete buildOptions.mpa

src/node/serve/serve.ts

@@ -16,6 +16,7 @@ function trimChar(str: string, char: string) {
 }
 
 export interface ServeOptions {
+  base?: string
   root?: string
   port?: number
 }
@@ -23,7 +24,7 @@ export interface ServeOptions {
 export async function serve(options: ServeOptions = {}) {
   const port = options.port !== undefined ? options.port : 5000
   const site = await resolveConfig(options.root, 'serve', 'production')
-  const base = trimChar(site?.site?.base ?? '', '/')
+  const base = trimChar(options?.base ?? site?.site?.base ?? '', '/')
 
   const compress = compression()
   const serve = sirv(site.outDir, {

src/node/server.ts

@@ -8,6 +8,11 @@ export async function createServer(
 ) {
   const config = await resolveConfig(root)
 
+  if (serverOptions.base) {
+    config.site.base = serverOptions.base
+    delete serverOptions.base
+  }
+
   return createViteServer({
     root: config.srcDir,
     base: config.site.base,