next-bundle-analyzer/dist/plugin/utils/getCommonChunks.js

NextJS version of Webpack Bundle Analyzer.

'use strict';

// @see https://github.com/vercel/next.js/blob/canary/packages/next/build/utils.ts
function getCommonChunks(buildManifest) {
    const chunksMap = new Map();
    let pageCount = 0;
    Object.entries(buildManifest.pages).forEach(([pageLabel, pageChunks]) => {
        pageCount += 1;
        pageChunks
            .filter((chunk) => !chunk.endsWith('.css'))
            .forEach((chunk) => {
            chunksMap.set(chunk, [...(chunksMap.get(chunk) || []), pageLabel]);
        });
    });
    return [...chunksMap.entries()]
        .filter(([, pageLabels]) => pageLabels.length > 1)
        .map(([chunk, pageLabels]) => ({
        chunk,
        sharedByPages: pageLabels.length >= pageCount ? 'all' : pageLabels,
    }));
}

exports.getCommonChunks = getCommonChunks;