Check for invalid objects in rewrites/redirects/headers

packages/next/lib/check-custom-routes.ts

@@ -95,6 +95,18 @@ export default function checkCustomRoutes(
   }
 
   for (const route of routes) {
+    if (!route || typeof route !== 'object') {
+      console.error(
+        `The route ${JSON.stringify(
+          route
+        )} is not a valid object with \`source\` and \`${
+          type === 'header' ? 'headers' : 'destination'
+        }\``
+      )
+      numInvalidRoutes++
+      continue
+    }
+
     const keys = Object.keys(route)
     const invalidKeys = keys.filter(key => !allowedKeys.has(key))
     const invalidParts: string[] = []

test/integration/invalid-custom-routes/test/index.test.js

@@ -59,6 +59,9 @@ const runTests = () => {
           destination: '/another',
           permanent: 'yes',
         },
+        // invalid objects
+        null,
+        'string',
       ],
       'redirects'
     )
@@ -68,6 +71,10 @@ const runTests = () => {
       `\`destination\` is missing for route {"source":"/hello","permanent":false}`
     )
 
+    expect(stderr).toContain(
+      `\`destination\` is missing for route {"source":"/hello","permanent":false}`
+    )
+
     expect(stderr).toContain(
       `\`source\` is not a string for route {"source":123,"destination":"/another","permanent":false}`
     )
@@ -85,8 +92,21 @@ const runTests = () => {
     )
 
     expect(stderr).toContain(
-      'Valid redirect statusCode values are 301, 302, 303, 307, 308'
+      `\`permanent\` is not set to \`true\` or \`false\` for route {"source":"/hello","destination":"/another","permanent":"yes"}`
+    )
+
+    expect(stderr).toContain(
+      `\`permanent\` is not set to \`true\` or \`false\` for route {"source":"/hello","destination":"/another","permanent":"yes"}`
+    )
+
+    expect(stderr).toContain(
+      `The route null is not a valid object with \`source\` and \`destination\``
+    )
+
+    expect(stderr).toContain(
+      `The route "string" is not a valid object with \`source\` and \`destination\``
     )
+
     expect(stderr).toContain('Invalid redirects found')
   })
 
@@ -122,6 +142,9 @@ const runTests = () => {
           source: '/feedback/(?!general)',
           destination: '/feedback/general',
         },
+        // invalid objects
+        null,
+        'string',
       ],
       'rewrites'
     )
@@ -150,6 +173,15 @@ const runTests = () => {
     expect(stderr).toContain(
       `Error parsing \`/feedback/(?!general)\` https://err.sh/zeit/next.js/invalid-route-source`
     )
+
+    expect(stderr).toContain(
+      `The route null is not a valid object with \`source\` and \`destination\``
+    )
+
+    expect(stderr).toContain(
+      `The route "string" is not a valid object with \`source\` and \`destination\``
+    )
+
     expect(stderr).toContain(`Reason: Pattern cannot start with "?" at 11`)
     expect(stderr).toContain(`/feedback/(?!general)`)
 
@@ -220,6 +252,9 @@ const runTests = () => {
             },
           ],
         },
+        // invalid objects
+        null,
+        'string',
       ],
       'headers'
     )
@@ -245,6 +280,14 @@ const runTests = () => {
       'invalid field: destination for route {"source":"/again","destination":"/another","headers":[{"key":"x-first","value":"idk"}]}'
     )
 
+    expect(stderr).toContain(
+      `The route null is not a valid object with \`source\` and \`headers\``
+    )
+
+    expect(stderr).toContain(
+      `The route "string" is not a valid object with \`source\` and \`headers\``
+    )
+
     expect(stderr).not.toContain('/valid-header')
   })