diff --git a/package-lock.json b/package-lock.json
index bff7a9e6..e048b86e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -346,6 +346,7 @@
     },
     "node_modules/@clack/prompts/node_modules/is-unicode-supported": {
       "version": "1.3.0",
+      "extraneous": true,
       "inBundle": true,
       "license": "MIT",
       "engines": {
@@ -449,6 +450,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=18"
       },
@@ -471,6 +473,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -1978,6 +1981,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.8.9",
         "caniuse-lite": "^1.0.30001746",
@@ -3780,6 +3784,7 @@
       "resolved": "https://registry.npmjs.org/jiti/-/jiti-1.21.7.tgz",
       "integrity": "sha512-/imKNG4EbWNrVjoNC/1H5/9GFy+tqjGBHCaSsN+P2RnPqjsLmv6UD3Ej+Kj8nBWaRAwyk7kK5ZUc+OEatnTR3A==",
       "license": "MIT",
+      "peer": true,
       "bin": {
         "jiti": "bin/jiti.js"
       }
@@ -4691,6 +4696,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.11",
         "picocolors": "^1.1.1",
@@ -4956,6 +4962,7 @@
       "resolved": "https://registry.npmjs.org/posthtml/-/posthtml-0.16.7.tgz",
       "integrity": "sha512-7Hc+IvlQ7hlaIfQFZnxlRl0jnpWq2qwibORBhQYIb0QbNtuicc5ZxvKkVT71HJ4Py1wSZ/3VR1r8LfkCtoCzhw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "posthtml-parser": "^0.11.0",
         "posthtml-render": "^3.0.0"
@@ -6639,6 +6646,7 @@
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -6833,6 +6841,7 @@
       "integrity": "sha512-uzcxnSDVjAopEUjljkWh8EIrg6tlzrjFUfMcR1EVsRDGwf/ccef0qQPRyOrROwhrTDaApueq+ja+KLPlzR/zdg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "esbuild": "^0.25.0",
         "fdir": "^6.5.0",
@@ -6949,6 +6958,7 @@
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -6962,6 +6972,7 @@
       "integrity": "sha512-LUCP5ev3GURDysTWiP47wRRUpLKMOfPh+yKTx3kVIEiu5KOMeqzpnYNsKyOoVrULivR8tLcks4+lga33Whn90A==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/chai": "^5.2.2",
         "@vitest/expect": "3.2.4",
diff --git a/src/server/index.js b/src/server/index.js
index 59739cc8..0d7e94b6 100644
--- a/src/server/index.js
+++ b/src/server/index.js
@@ -258,7 +258,9 @@ export default async (config = {}) => {
     staticFiles = [staticFiles]
   }
 
-  const staticFilesSourcePaths = staticFiles.flatMap((definition) => definition.source)
+  const staticFilesSourcePaths = staticFiles
+    .flatMap((definition) => definition.source)
+    .filter(p => typeof p === 'string')
 
   /**
    * Global watcher
@@ -273,7 +275,7 @@ export default async (config = {}) => {
     '**/*.css',
     ...staticFilesSourcePaths,
     ...get(config, 'server.watch', []),
-  ])
+  ].filter(p => typeof p === 'string'))
 
   async function globalPathsHandler(file, eventType) {
     // Update express.static to serve new files