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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),
})
}
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