next/dist/esm/next-devtools/server/attach-nodejs-debugger-middleware.js

The React Framework

import { middlewareResponse } from './middleware-response';
import * as inspector from 'inspector';
export function getAttachNodejsDebuggerMiddleware() {
    return async function(req, res, next) {
        const { pathname } = new URL(`http://n${req.url}`);
        if (pathname !== '/__nextjs_attach-nodejs-inspector') {
            return next();
        }
        try {
            const isInspecting = inspector.url() !== undefined;
            const debugPort = process.debugPort;
            if (!isInspecting) {
                // Node.js will already log that the inspector is listening.
                inspector.open(debugPort);
            }
            const inspectorURLRaw = inspector.url();
            if (inspectorURLRaw === undefined) {
                // could not open, possibly because already in use.
                return middlewareResponse.badRequest(res, `Failed to open port "${debugPort}". Address may be already in use.`);
            }
            const inspectorURL = new URL(inspectorURLRaw);
            const debugInfoListResponse = await fetch(`http://${inspectorURL.host}/json/list`);
            const debugInfoList = await debugInfoListResponse.json();
            if (!Array.isArray(debugInfoList) || debugInfoList.length === 0) {
                throw Object.defineProperty(new Error('No debug targets found'), "__NEXT_ERROR_CODE", {
                    value: "E927",
                    enumerable: false,
                    configurable: true
                });
            }
            return middlewareResponse.json(res, debugInfoList[0].devtoolsFrontendUrl);
        } catch (error) {
            return middlewareResponse.internalServerError(res);
        }
    };
}

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