Add sirvOptions config

packages/root/src/cli/dev.ts

@@ -5,6 +5,7 @@ import cookieParser from 'cookie-parser';
 import {default as express} from 'express';
 import {dim} from 'kleur/colors';
 import sirv from 'sirv';
+import type {Options as SirvOptions} from 'sirv';
 import glob from 'tiny-glob';
 
 import {ViteDevServer} from 'vite';
@@ -111,7 +112,13 @@ export async function createDevServer(options?: {
       // Add static file middleware.
       const publicDir = path.join(rootDir, 'public');
       if (await dirExists(publicDir)) {
-        server.use(rootPublicDirMiddleware({publicDir, viteServer}));
+        const sirvOptions = Object.assign(
+          {dev: false},
+          rootConfig.server?.sirvOptions || {}
+        );
+        server.use(
+          rootPublicDirMiddleware({publicDir, viteServer, sirvOptions})
+        );
       }
 
       // NOTE: The trailing slash middleware needs to come after public files so
@@ -228,14 +235,15 @@ async function createViteMiddleware(options: {
 function rootPublicDirMiddleware(options: {
   publicDir: string;
   viteServer: ViteDevServer;
+  sirvOptions: SirvOptions;
 }) {
   const publicDir = options.publicDir;
 
   // The `{dev: false}` option is used for performance reasons. When dev is set
   // to `true`, every request will traverse the filesystem to check if a
   // matching file exists. Setting it to `false` uses a cache, which can be
   // reloaded whenever a file change is detected in the `public` directory.
-  const sirvOptions = {dev: false};
+  const sirvOptions = options.sirvOptions;
   let handler = sirv(publicDir, sirvOptions);
 
   const reloadPublicDirCache = debounce(() => {

packages/root/src/cli/preview.ts

@@ -97,7 +97,11 @@ export async function createPreviewServer(options: {
 
       // Add static file middleware.
       const publicDir = path.join(distDir, 'html');
-      server.use(sirv(publicDir, {dev: false}));
+      const sirvOptions = Object.assign(
+        {dev: false},
+        rootConfig.server?.sirvOptions || {}
+      );
+      server.use(sirv(publicDir, sirvOptions));
 
       // NOTE: The trailing slash middleware needs to come after public files so
       // that slashes are not appended to public file routes.

packages/root/src/cli/start.ts

@@ -92,7 +92,11 @@ export async function createProdServer(options: {
 
       // Add static file middleware.
       const publicDir = path.join(distDir, 'html');
-      server.use(sirv(publicDir, {dev: false}));
+      const sirvOptions = Object.assign(
+        {dev: false},
+        rootConfig.server?.sirvOptions || {}
+      );
+      server.use(sirv(publicDir, sirvOptions));
 
       // NOTE: The trailing slash middleware needs to come after public files so
       // that slashes are not appended to public file routes.

packages/root/src/core/config.ts

@@ -3,6 +3,7 @@ import {HtmlMinifyOptions} from '../render/html-minify.js';
 import {HtmlPrettyOptions} from '../render/html-pretty.js';
 import {Plugin} from './plugin.js';
 import {RequestMiddleware} from './types.js';
+import type {Options as SirvOptions} from 'sirv';
 
 export interface RootUserConfig {
   /**
@@ -270,6 +271,12 @@ export interface RootServerConfig {
    * Home page URL path, which is printed when the dev server starts.
    */
   homePagePath?: string;
+
+  /**
+   * Options passed to sirv when serving static files. These options are merged
+   * with Root.js defaults.
+   */
+  sirvOptions?: SirvOptions;
 }
 
 export function defineConfig(config: RootUserConfig): RootUserConfig {