next/dist/esm/build/templates/middleware.js

The React Framework

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 page = 'VAR_DEFINITION_PAGE';
const isProxy = page === '/proxy' || page === '/src/proxy';
const handlerUserland = (isProxy ? mod.proxy : mod.middleware) || mod.default;
class ProxyMissingExportError extends Error {
    constructor(message){
        super(message);
        // Stack isn't useful here, remove it considering it spams logs during development.
        this.stack = '';
    }
}
// TODO: This spams logs during development. Find a better way to handle this.
// Removing this will spam "fn is not a function" logs which is worse.
if (typeof handlerUserland !== 'function') {
    throw new ProxyMissingExportError(`The ${isProxy ? 'Proxy' : 'Middleware'} file "${page}" must export a function named \`${isProxy ? 'proxy' : 'middleware'}\` or a default function.`);
}
// Proxy will only sent out the FetchEvent to next server,
// so load instrumentation module here and track the error inside proxy module.
function errorHandledHandler(fn) {
    return async (...args)=>{
        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 proxy 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 ${isProxy ? 'Proxy' : '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: '/proxy',
                routeType: 'proxy',
                revalidateReason: undefined
            });
            throw err;
        }
    };
}
const handler = (opts)=>{
    return adapter({
        ...opts,
        page,
        handler: errorHandledHandler(handlerUserland)
    });
};
export default handler;

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