Ensure default config passes schema checks

packages/next/src/server/config-schema.ts

@@ -11,7 +11,7 @@ const configSchema = {
       additionalProperties: false,
       properties: {
         canonicalBase: {
-          minLength: 1,
+          nullable: true,
           type: 'string',
         },
       },
@@ -21,7 +21,7 @@ const configSchema = {
       type: 'string',
     },
     assetPrefix: {
-      minLength: 1,
+      nullable: true,
       type: 'string',
     },
     basePath: {
@@ -170,6 +170,9 @@ const configSchema = {
     compress: {
       type: 'boolean',
     },
+    configOrigin: {
+      type: 'string',
+    },
     crossOrigin: {
       oneOf: [
         false,
@@ -342,7 +345,7 @@ const configSchema = {
           type: 'boolean',
         },
         outputFileTracingRoot: {
-          minLength: 1,
+          nullable: true,
           type: 'string',
         },
         outputFileTracingExcludes: {
@@ -521,6 +524,7 @@ const configSchema = {
     },
     i18n: {
       additionalProperties: false,
+      nullable: true,
       properties: {
         defaultLocale: {
           minLength: 1,
@@ -568,17 +572,17 @@ const configSchema = {
     },
     images: {
       additionalProperties: false,
+      nullable: true,
       properties: {
         remotePatterns: {
+          nullable: true,
           items: {
             additionalProperties: false,
             properties: {
               hostname: {
-                minLength: 1,
                 type: 'string',
               },
               pathname: {
-                minLength: 1,
                 type: 'string',
               },
               port: {
@@ -601,35 +605,39 @@ const configSchema = {
           type: 'boolean',
         },
         contentSecurityPolicy: {
-          minLength: 1,
           type: 'string',
+          nullable: true,
         },
         contentDispositionType: {
           enum: ['inline', 'attachment'] as any, // automatic typing does not like enum
           type: 'string',
+          nullable: true,
         },
         dangerouslyAllowSVG: {
           type: 'boolean',
+          nullable: true,
         },
         deviceSizes: {
           items: {
             type: 'integer',
             minimum: 1,
             maximum: 10000,
           },
-          minItems: 1,
           maxItems: 25,
           type: 'array',
+          nullable: true,
         },
         disableStaticImages: {
           type: 'boolean',
+          nullable: true,
         },
         domains: {
           items: {
             type: 'string',
           },
           maxItems: 50,
           type: 'array',
+          nullable: true,
         },
         formats: {
           items: {
@@ -638,6 +646,7 @@ const configSchema = {
           } as any,
           maxItems: 4,
           type: 'array',
+          nullable: true,
         },
         imageSizes: {
           items: {
@@ -648,23 +657,26 @@ const configSchema = {
           minItems: 0,
           maxItems: 25,
           type: 'array',
+          nullable: true,
         },
         loader: {
           // automatic typing does not like enum
           enum: VALID_LOADERS as any,
           type: 'string',
+          nullable: true,
         },
         loaderFile: {
-          minLength: 1,
           type: 'string',
+          nullable: true,
         },
         minimumCacheTTL: {
           type: 'integer',
           minimum: 0,
+          nullable: true,
         },
         path: {
-          minLength: 1,
           type: 'string',
+          nullable: true,
         },
       },
       type: 'object',
@@ -737,6 +749,9 @@ const configSchema = {
     swcMinify: {
       type: 'boolean',
     },
+    target: {
+      type: 'string',
+    },
     trailingSlash: {
       type: 'boolean',
     },
@@ -768,7 +783,7 @@ const configSchema = {
         'must be a function that returns a webpack configuration object',
     } as any,
   },
-} as JSONSchemaType<NextConfig>
+} as JSONSchemaType<NextConfig & { configOrigin?: any; target?: any }>
 
 // module.exports is used to get around an export bug with TypeScript
 // and the Ajv automatic typing

packages/next/src/server/config-shared.ts

@@ -16,6 +16,7 @@ export type NextConfigComplete = Required<NextConfig> & {
   configOrigin?: string
   configFile?: string
   configFileName: string
+  target?: string
 }
 
 export interface I18NConfig {
@@ -569,7 +570,6 @@ export interface NextConfig extends Record<string, any> {
 export const defaultConfig: NextConfig = {
   env: {},
   webpack: null,
-  webpackDevMiddleware: null,
   eslint: {
     ignoreDuringBuilds: false,
   },
@@ -610,7 +610,7 @@ export const defaultConfig: NextConfig = {
   excludeDefaultMomentLocales: true,
   serverRuntimeConfig: {},
   publicRuntimeConfig: {},
-  reactStrictMode: null,
+  reactStrictMode: false,
   httpAgentOptions: {
     keepAlive: true,
   },

packages/next/taskfile.js

@@ -304,11 +304,11 @@ export async function compile_config_schema(task, opts) {
     keyword: 'isFunction',
     schemaType: 'boolean',
     compile() {
-      return (data) => data instanceof Function
+      return (data) => data == null || data instanceof Function
     },
     code(ctx) {
       const { data } = ctx
-      ctx.fail(Ajv._`!(${data} instanceof Function)`)
+      ctx.fail(Ajv._`!(${data} == null || ${data} instanceof Function)`)
     },
     metaSchema: {
       anyOf: [{ type: 'boolean' }],

test/integration/config-schema-check/next.config.js

@@ -0,0 +1,3 @@
+module.exports = (phase, { defaultConfig }) => {
+  return defaultConfig
+}

test/integration/config-schema-check/pages/index.js

@@ -0,0 +1,3 @@
+export default function Page() {
+  return <p>hello world</p>
+}

test/integration/config-schema-check/test/index.test.js

@@ -0,0 +1,20 @@
+/* eslint-env jest */
+
+import { join } from 'path'
+import { nextBuild } from 'next-test-utils'
+import stripAnsi from 'strip-ansi'
+
+const appDir = join(__dirname, '../')
+
+describe('next.config.js schema validating', () => {
+  it('should validate against defaultConfig', async () => {
+    const result = await nextBuild(appDir, undefined, {
+      stderr: true,
+      stdout: true,
+    })
+    const output = stripAnsi(result.stderr + result.stdout)
+
+    expect(output).not.toContain('Invalid next.config.js options detected')
+    expect(result.code).toBe(0)
+  })
+})