First design of frontpage

.next/types/app/layout.ts

@@ -0,0 +1,79 @@
+// File: /home/nextjs/scrap/src/app/layout.tsx
+import * as entry from '../../../src/app/layout.js'
+import type { ResolvingMetadata, ResolvingViewport } from 'next/dist/lib/metadata/types/metadata-interface.js'
+
+type TEntry = typeof import('../../../src/app/layout.js')
+
+// Check that the entry is a valid entry
+checkFields<Diff<{
+  default: Function
+  config?: {}
+  generateStaticParams?: Function
+  revalidate?: RevalidateRange<TEntry> | false
+  dynamic?: 'auto' | 'force-dynamic' | 'error' | 'force-static'
+  dynamicParams?: boolean
+  fetchCache?: 'auto' | 'force-no-store' | 'only-no-store' | 'default-no-store' | 'default-cache' | 'only-cache' | 'force-cache'
+  preferredRegion?: 'auto' | 'global' | 'home' | string | string[]
+  runtime?: 'nodejs' | 'experimental-edge' | 'edge'
+  maxDuration?: number
+  
+  metadata?: any
+  generateMetadata?: Function
+  viewport?: any
+  generateViewport?: Function
+  
+}, TEntry, ''>>()
+
+// Check the prop type of the entry function
+checkFields<Diff<LayoutProps, FirstArg<TEntry['default']>, 'default'>>()
+
+// Check the arguments and return type of the generateMetadata function
+if ('generateMetadata' in entry) {
+  checkFields<Diff<LayoutProps, FirstArg<MaybeField<TEntry, 'generateMetadata'>>, 'generateMetadata'>>()
+  checkFields<Diff<ResolvingMetadata, SecondArg<MaybeField<TEntry, 'generateMetadata'>>, 'generateMetadata'>>()
+}
+
+// Check the arguments and return type of the generateViewport function
+if ('generateViewport' in entry) {
+  checkFields<Diff<LayoutProps, FirstArg<MaybeField<TEntry, 'generateViewport'>>, 'generateViewport'>>()
+  checkFields<Diff<ResolvingViewport, SecondArg<MaybeField<TEntry, 'generateViewport'>>, 'generateViewport'>>()
+}
+
+// Check the arguments and return type of the generateStaticParams function
+if ('generateStaticParams' in entry) {
+  checkFields<Diff<{ params: PageParams }, FirstArg<MaybeField<TEntry, 'generateStaticParams'>>, 'generateStaticParams'>>()
+  checkFields<Diff<{ __tag__: 'generateStaticParams', __return_type__: any[] | Promise<any[]> }, { __tag__: 'generateStaticParams', __return_type__: ReturnType<MaybeField<TEntry, 'generateStaticParams'>> }>>()
+}
+
+type PageParams = any
+export interface PageProps {
+  params?: any
+  searchParams?: any
+}
+export interface LayoutProps {
+  children?: React.ReactNode
+
+  params?: any
+}
+
+// =============
+// Utility types
+type RevalidateRange<T> = T extends { revalidate: any } ? NonNegative<T['revalidate']> : never
+
+// If T is unknown or any, it will be an empty {} type. Otherwise, it will be the same as Omit<T, keyof Base>.
+type OmitWithTag<T, K extends keyof any, _M> = Omit<T, K>
+type Diff<Base, T extends Base, Message extends string = ''> = 0 extends (1 & T) ? {} : OmitWithTag<T, keyof Base, Message>
+
+type FirstArg<T extends Function> = T extends (...args: [infer T, any]) => any ? unknown extends T ? any : T : never
+type SecondArg<T extends Function> = T extends (...args: [any, infer T]) => any ? unknown extends T ? any : T : never
+type MaybeField<T, K extends string> = T extends { [k in K]: infer G } ? G extends Function ? G : never : never
+
+
+
+function checkFields<_ extends { [k in keyof any]: never }>() {}
+
+// https://github.com/sindresorhus/type-fest
+type Numeric = number | bigint
+type Zero = 0 | 0n
+type Negative<T extends Numeric> = T extends Zero ? never : `${T}` extends `-${string}` ? T : never
+type NonNegative<T extends Numeric> = T extends Zero ? T : Negative<T> extends never ? T : '__invalid_negative_number__'

.next/types/app/page.ts

@@ -0,0 +1,79 @@
+// File: /home/nextjs/scrap/src/app/page.tsx
+import * as entry from '../../../src/app/page.js'
+import type { ResolvingMetadata, ResolvingViewport } from 'next/dist/lib/metadata/types/metadata-interface.js'
+
+type TEntry = typeof import('../../../src/app/page.js')
+
+// Check that the entry is a valid entry
+checkFields<Diff<{
+  default: Function
+  config?: {}
+  generateStaticParams?: Function
+  revalidate?: RevalidateRange<TEntry> | false
+  dynamic?: 'auto' | 'force-dynamic' | 'error' | 'force-static'
+  dynamicParams?: boolean
+  fetchCache?: 'auto' | 'force-no-store' | 'only-no-store' | 'default-no-store' | 'default-cache' | 'only-cache' | 'force-cache'
+  preferredRegion?: 'auto' | 'global' | 'home' | string | string[]
+  runtime?: 'nodejs' | 'experimental-edge' | 'edge'
+  maxDuration?: number
+  
+  metadata?: any
+  generateMetadata?: Function
+  viewport?: any
+  generateViewport?: Function
+  
+}, TEntry, ''>>()
+
+// Check the prop type of the entry function
+checkFields<Diff<PageProps, FirstArg<TEntry['default']>, 'default'>>()
+
+// Check the arguments and return type of the generateMetadata function
+if ('generateMetadata' in entry) {
+  checkFields<Diff<PageProps, FirstArg<MaybeField<TEntry, 'generateMetadata'>>, 'generateMetadata'>>()
+  checkFields<Diff<ResolvingMetadata, SecondArg<MaybeField<TEntry, 'generateMetadata'>>, 'generateMetadata'>>()
+}
+
+// Check the arguments and return type of the generateViewport function
+if ('generateViewport' in entry) {
+  checkFields<Diff<PageProps, FirstArg<MaybeField<TEntry, 'generateViewport'>>, 'generateViewport'>>()
+  checkFields<Diff<ResolvingViewport, SecondArg<MaybeField<TEntry, 'generateViewport'>>, 'generateViewport'>>()
+}
+
+// Check the arguments and return type of the generateStaticParams function
+if ('generateStaticParams' in entry) {
+  checkFields<Diff<{ params: PageParams }, FirstArg<MaybeField<TEntry, 'generateStaticParams'>>, 'generateStaticParams'>>()
+  checkFields<Diff<{ __tag__: 'generateStaticParams', __return_type__: any[] | Promise<any[]> }, { __tag__: 'generateStaticParams', __return_type__: ReturnType<MaybeField<TEntry, 'generateStaticParams'>> }>>()
+}
+
+type PageParams = any
+export interface PageProps {
+  params?: any
+  searchParams?: any
+}
+export interface LayoutProps {
+  children?: React.ReactNode
+
+  params?: any
+}
+
+// =============
+// Utility types
+type RevalidateRange<T> = T extends { revalidate: any } ? NonNegative<T['revalidate']> : never
+
+// If T is unknown or any, it will be an empty {} type. Otherwise, it will be the same as Omit<T, keyof Base>.
+type OmitWithTag<T, K extends keyof any, _M> = Omit<T, K>
+type Diff<Base, T extends Base, Message extends string = ''> = 0 extends (1 & T) ? {} : OmitWithTag<T, keyof Base, Message>
+
+type FirstArg<T extends Function> = T extends (...args: [infer T, any]) => any ? unknown extends T ? any : T : never
+type SecondArg<T extends Function> = T extends (...args: [any, infer T]) => any ? unknown extends T ? any : T : never
+type MaybeField<T, K extends string> = T extends { [k in K]: infer G } ? G extends Function ? G : never : never
+
+
+
+function checkFields<_ extends { [k in keyof any]: never }>() {}
+
+// https://github.com/sindresorhus/type-fest
+type Numeric = number | bigint
+type Zero = 0 | 0n
+type Negative<T extends Numeric> = T extends Zero ? never : `${T}` extends `-${string}` ? T : never
+type NonNegative<T extends Numeric> = T extends Zero ? T : Negative<T> extends never ? T : '__invalid_negative_number__'