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Next.js createPage helper with loader pattern
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| import type { AnyZodObject, z } from "zod"; | |
| import type { Metadata, ResolvingMetadata } from "next"; | |
| type InferParams<Params> = Params extends readonly string[] | |
| ? { | |
| [K in Params[number]]?: string; | |
| } | |
| : Params extends AnyZodObject | |
| ? z.infer<Params> | |
| : unknown; | |
| type LoaderFn< | |
| Params extends readonly string[] | AnyZodObject, | |
| SearchParams extends readonly string[] | AnyZodObject, | |
| > = (args: { | |
| params: InferParams<Params>; | |
| searchParams: InferParams<SearchParams>; | |
| }) => Promise<unknown>; | |
| type InferLoaderData<Loader> = Loader extends (args: unknown) => Promise<infer T> ? T : unknown; | |
| export interface CreatePageProps< | |
| Params extends readonly string[] | AnyZodObject, | |
| SearchParams extends readonly string[] | AnyZodObject, | |
| Loader extends LoaderFn<Params, SearchParams> = LoaderFn<Params, SearchParams>, | |
| > { | |
| params?: Params; | |
| searchParams?: SearchParams; | |
| loader?: Loader; | |
| metadata?: | |
| | Metadata | |
| | (( | |
| args: { | |
| params: InferParams<Params>; | |
| searchParams: InferParams<SearchParams>; | |
| data: InferLoaderData<Loader>; | |
| }, | |
| parent: ResolvingMetadata, | |
| ) => Promise<Metadata>); | |
| component: React.ComponentType<{ | |
| params: InferParams<Params>; | |
| searchParams?: InferParams<SearchParams>; | |
| data: InferLoaderData<Loader>; | |
| }>; | |
| } | |
| function parseParams<Schema extends readonly string[] | AnyZodObject>(params: Record<string, string>, schema?: Schema) { | |
| if (schema && "parse" in schema) { | |
| return schema.parse(params) as InferParams<Schema>; | |
| } | |
| return params as InferParams<Schema>; | |
| } | |
| export const createPage = < | |
| Params extends readonly string[] | AnyZodObject, | |
| SearchParams extends readonly string[] | AnyZodObject, | |
| Loader extends LoaderFn<Params, SearchParams> = LoaderFn<Params, SearchParams>, | |
| >( | |
| props: CreatePageProps<Params, SearchParams, Loader>, | |
| ) => { | |
| const { params: paramsSchema, searchParams: searchParamsSchema, component: PageComponent, loader, metadata } = props; | |
| async function Page(props: { | |
| params: Record<string, string>; | |
| searchParams: Record<string, string>; | |
| }) { | |
| const params = parseParams(props.params, paramsSchema); | |
| const searchParams = parseParams(props.searchParams, searchParamsSchema); | |
| const pageProps = { | |
| data: undefined as InferLoaderData<Loader>, | |
| params, | |
| searchParams, | |
| }; | |
| if (typeof loader === "function") { | |
| pageProps.data = (await loader(pageProps)) as InferLoaderData<Loader>; | |
| } | |
| return <PageComponent {...pageProps} />; | |
| } | |
| if (typeof metadata === "function") { | |
| return { | |
| generateMetaData: async ( | |
| { | |
| params, | |
| searchParams, | |
| }: { | |
| params: InferParams<Params>; | |
| searchParams: InferParams<SearchParams>; | |
| }, | |
| parent: ResolvingMetadata, | |
| ) => { | |
| const data = ( | |
| typeof loader === "function" | |
| ? await loader({ | |
| params, | |
| searchParams, | |
| }) | |
| : undefined | |
| ) as InferLoaderData<Loader>; | |
| return metadata( | |
| { | |
| params, | |
| searchParams, | |
| data, | |
| }, | |
| parent, | |
| ); | |
| }, | |
| Page, | |
| }; | |
| } | |
| return { | |
| metadata, | |
| Page, | |
| }; | |
| }; |
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