next/dist/esm/build/analyze/index.js

The React Framework

import { setGlobal } from '../../trace';
import * as Log from '../output/log';
import * as path from 'node:path';
import loadConfig from '../../server/config';
import { PHASE_ANALYZE } from '../../shared/lib/constants';
import { turbopackAnalyze } from '../turbopack-analyze';
import { durationToString } from '../duration-to-string';
import { cp, writeFile, mkdir } from 'node:fs/promises';
import { discoverRoutes } from '../route-discovery';
import { findPagesDir } from '../../lib/find-pages-dir';
import loadCustomRoutes from '../../lib/load-custom-routes';
import { generateRoutesManifest } from '../generate-routes-manifest';
import { checkIsAppPPREnabled } from '../../server/lib/experimental/ppr';
import { normalizeAppPath } from '../../shared/lib/router/utils/app-paths';
import http from 'node:http';
// @ts-expect-error types are in @types/serve-handler
import serveHandler from 'next/dist/compiled/serve-handler';
import { Telemetry } from '../../telemetry/storage';
import { eventAnalyzeCompleted } from '../../telemetry/events';
import { traceGlobals } from '../../trace/shared';
import { Bundler } from '../../lib/bundler';
export default async function analyze({ dir, reactProductionProfiling = false, noMangling = false, appDirOnly = false, output = false, port = 4000 }) {
    try {
        const config = await loadConfig(PHASE_ANALYZE, dir, {
            silent: false,
            reactProductionProfiling,
            bundler: Bundler.Turbopack
        });
        process.env.NEXT_DEPLOYMENT_ID = config.deploymentId || '';
        const distDir = path.join(dir, '.next');
        const telemetry = new Telemetry({
            distDir
        });
        setGlobal('phase', PHASE_ANALYZE);
        setGlobal('distDir', distDir);
        setGlobal('telemetry', telemetry);
        Log.info('Analyzing a production build...');
        const analyzeContext = {
            config,
            dir,
            distDir,
            noMangling,
            appDirOnly
        };
        const { duration: analyzeDuration, shutdownPromise } = await turbopackAnalyze(analyzeContext);
        const durationString = durationToString(analyzeDuration);
        const analyzeDir = path.join(distDir, 'diagnostics/analyze');
        await shutdownPromise;
        const routes = await collectRoutesForAnalyze(dir, config, appDirOnly);
        await cp(path.join(__dirname, '../../bundle-analyzer'), analyzeDir, {
            recursive: true
        });
        await mkdir(path.join(analyzeDir, 'data'), {
            recursive: true
        });
        await writeFile(path.join(analyzeDir, 'data', 'routes.json'), JSON.stringify(routes, null, 2));
        let logMessage = `Analyze completed in ${durationString}.`;
        if (output) {
            logMessage += ` Results written to ${analyzeDir}.\nTo explore the analyze results interactively, run \`next experimental-analyze\` without \`--output\`.`;
        }
        Log.event(logMessage);
        telemetry.record(eventAnalyzeCompleted({
            success: true,
            durationInSeconds: Math.round(analyzeDuration),
            totalPageCount: routes.length
        }));
        if (!output) {
            await startServer(analyzeDir, port);
        }
    } catch (e) {
        const telemetry = traceGlobals.get('telemetry');
        if (telemetry) {
            telemetry.record(eventAnalyzeCompleted({
                success: false
            }));
        }
        throw e;
    }
}
/**
 * Collects all routes from the project for the bundle analyzer.
 * Returns a list of route paths (both static and dynamic).
 */ async function collectRoutesForAnalyze(dir, config, appDirOnly) {
    const { pagesDir, appDir } = findPagesDir(dir);
    let appType;
    if (pagesDir && appDir) {
        appType = 'hybrid';
    } else if (pagesDir) {
        appType = 'pages';
    } else if (appDir) {
        appType = 'app';
    } else {
        throw Object.defineProperty(new Error('No pages or app directory found.'), "__NEXT_ERROR_CODE", {
            value: "E929",
            enumerable: false,
            configurable: true
        });
    }
    const discovery = await discoverRoutes({
        appDir,
        pagesDir,
        pageExtensions: config.pageExtensions,
        isDev: false,
        baseDir: dir,
        isSrcDir: path.relative(dir, pagesDir || appDir || '').startsWith('src'),
        appDirOnly
    });
    const pageKeys = {
        pages: Object.keys(discovery.mappedPages || {}),
        app: discovery.mappedAppPages ? Object.keys(discovery.mappedAppPages).map((key)=>normalizeAppPath(key)) : []
    };
    // Load custom routes
    const { redirects, headers, onMatchHeaders, rewrites } = await loadCustomRoutes(config);
    // Compute restricted redirect paths
    const restrictedRedirectPaths = [
        '/_next'
    ].map((pathPrefix)=>config.basePath ? `${config.basePath}${pathPrefix}` : pathPrefix);
    const isAppPPREnabled = checkIsAppPPREnabled(config.experimental.ppr);
    // Generate routes manifest
    const { routesManifest } = generateRoutesManifest({
        appType,
        pageKeys,
        config,
        redirects,
        headers,
        onMatchHeaders,
        rewrites,
        restrictedRedirectPaths,
        isAppPPREnabled
    });
    return routesManifest.dynamicRoutes.map((r)=>r.page).concat(routesManifest.staticRoutes.map((r)=>r.page));
}
function startServer(dir, port) {
    const server = http.createServer((req, res)=>{
        return serveHandler(req, res, {
            public: dir
        });
    });
    return new Promise((resolve, reject)=>{
        function onError(err) {
            server.close(()=>{
                reject(err);
            });
        }
        server.on('error', onError);
        server.listen(port, 'localhost', ()=>{
            const address = server.address();
            if (address == null) {
                reject(Object.defineProperty(new Error('Unable to get server address'), "__NEXT_ERROR_CODE", {
                    value: "E928",
                    enumerable: false,
                    configurable: true
                }));
                return;
            }
            // No longer needed after startup
            server.removeListener('error', onError);
            let addressString;
            if (typeof address === 'string') {
                addressString = address;
            } else if (address.family === 'IPv6' && (address.address === '::' || address.address === '::1')) {
                addressString = `localhost:${address.port}`;
            } else if (address.family === 'IPv6') {
                addressString = `[${address.address}]:${address.port}`;
            } else {
                addressString = `${address.address}:${address.port}`;
            }
            Log.info(`Bundle analyzer available at http://${addressString}`);
            resolve();
        });
    });
}

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