fix: gracefully handle mssing middleware (#821)

Release-As: 4.0.0-beta.9

Author: ascorbic

src/helpers/files.js

@@ -22,7 +22,7 @@ const stripLocale = (rawPath, locales = []) => {
 }
 
 const matchMiddleware = (middleware, filePath) =>
-  middleware.includes('') ||
+  middleware?.includes('') ||
   middleware?.find(
     (middlewarePath) =>
       filePath === middlewarePath || filePath === `${middlewarePath}.html` || filePath.startsWith(`${middlewarePath}/`),

test/index.js

@@ -410,6 +410,22 @@ describe('utility functions', () => {
     }
   })
 
+  test('middleware tester matches root middleware', () => {
+    const paths = [
+      'middl',
+      '',
+      'somethingelse',
+      'another.html',
+      'another/middle.html',
+      'sub/anotherdirectory.html',
+      'sub/directoryelse',
+      'sub/directoryelse.html',
+    ]
+    for (const path of paths) {
+      expect(matchMiddleware(undefined, path)).toBeFalsy()
+    }
+  })
+
   test('stripLocale correctly strips matching locales', () => {
     const locales = ['en', 'fr', 'en-GB']
     const paths = [