hot-hash-webpack-plugin/index.js

a hot-update hash tool

const path = require('path');
const crypto = require('crypto');
const fs = require('fs');
const { formatDate } = require('./util');

class HotHashWebpackPlugin {
    constructor(options) {
        this.version = options && options.version;
    }

    apply(compiler) {
        compiler.hooks.afterEmit.tapAsync(
            'HotHashWebpackPlugin',
            (compilation, callback) => {
                const outputPath = compiler.options.output.path;
                const buildJsonFile = path.resolve(
                    outputPath,
                    'filesinfo.json'
                );
                const fileInfoList = [];
                const assets = compilation.getAssets();
                assets.forEach((asset) => {
                    const filepath = path.resolve(outputPath, asset.name);
                    const content = fs.readFileSync(filepath);
                    const hash = crypto.createHash('sha256');
                    hash.update(content);
                    const hashContent = hash.digest('hex');
                    fileInfoList.push({
                        path: asset.name,
                        hash: hashContent,
                        size: content.length,
                    });
                });
                const json = {
                    lastBuildTDate: formatDate(new Date()),
                    fileInfoList,
                    version: this.version,
                };
                const text = JSON.stringify(json);
                compiler.outputFileSystem.writeFile(
                    buildJsonFile,
                    text,
                    callback
                );
            }
        );
    }
}

module.exports = HotHashWebpackPlugin;