Download next.js/packages/next/src/build/templates/middleware.ts from Devendra174/react-code-dataset: direct link, hf CLI and curl.
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| import type { AdapterOptions } from '../../server/web/adapter' | |
| import '../../server/web/globals' | |
| import { adapter } from '../../server/web/adapter' | |
| // Import the userland code. | |
| import * as _mod from 'VAR_USERLAND' | |
| import { edgeInstrumentationOnRequestError } from '../../server/web/globals' | |
| import { isNextRouterError } from '../../client/components/is-next-router-error' | |
| const mod = { ..._mod } | |
| const handler = mod.middleware || mod.default | |
| const page = 'VAR_DEFINITION_PAGE' | |
| if (typeof handler !== 'function') { | |
| throw new Error( | |
| `The Middleware "${page}" must export a \`middleware\` or a \`default\` function` | |
| ) | |
| } | |
| // Middleware will only sent out the FetchEvent to next server, | |
| // so load instrumentation module here and track the error inside middleware module. | |
| function errorHandledHandler(fn: AdapterOptions['handler']) { | |
| return async (...args: Parameters<AdapterOptions['handler']>) => { | |
| try { | |
| return await fn(...args) | |
| } catch (err) { | |
| // In development, error the navigation API usage in runtime, | |
| // since it's not allowed to be used in middleware as it's outside of react component tree. | |
| if (process.env.NODE_ENV !== 'production') { | |
| if (isNextRouterError(err)) { | |
| err.message = `Next.js navigation API is not allowed to be used in Middleware.` | |
| throw err | |
| } | |
| } | |
| const req = args[0] | |
| const url = new URL(req.url) | |
| const resource = url.pathname + url.search | |
| await edgeInstrumentationOnRequestError( | |
| err, | |
| { | |
| path: resource, | |
| method: req.method, | |
| headers: Object.fromEntries(req.headers.entries()), | |
| }, | |
| { | |
| routerKind: 'Pages Router', | |
| routePath: '/middleware', | |
| routeType: 'middleware', | |
| revalidateReason: undefined, | |
| } | |
| ) | |
| throw err | |
| } | |
| } | |
| } | |
| export default function nHandler( | |
| opts: Omit<AdapterOptions, 'IncrementalCache' | 'page' | 'handler'> | |
| ) { | |
| return adapter({ | |
| ...opts, | |
| page, | |
| handler: errorHandledHandler(handler), | |
| }) | |
| } | |