koot/utils/generate-filemap-from-compilation.js

const path = require('path')

/**
 * 从 Webpack compilation 数据中生成文件对应表 (Filemap)
 * @param {Object} compilation 
 * @param {String} [dirRelative] 
 * @returns {Object} 文件对应表 (Filemap)
 */
module.exports = (compilation, dirRelative) => {
    if (typeof compilation !== 'object') return undefined

    const filemap = {}
    const stats = compilation.getStats()

    for (let id in stats.compilation.chunks) {
        const o = stats.compilation.chunks[id]
        if (typeof o.name === 'undefined' || o.name === null) continue
        if (Array.isArray(o.files)) {
            o.files
                .filter(filename => !/\.(js|css)\.map$/i.test(filename))
                .forEach(filename => {
                    const extname = path.extname(filename)
                    const file = o.name + extname
                    if (typeof filemap[file] !== 'string')
                        filemap[file] = process.env.WEBPACK_BUILD_ENV === 'dev'
                            ? filename
                            : (dirRelative ? dirRelative + '/' : '') + filename
                })
        }
    }

    return filemap
}