RnMultibundler/metro.common.config.js

const { hasBuildInfo, writeBuildInfo, clean } = require('./build.js');
const {mergeConfig, getDefaultConfig} = require('@react-native/metro-config');

function createModuleIdFactory() {
  const fileToIdMap = new Map();
  let nextId = 0;
  clean('./config/bundleCommonInfo.json');

  // 如果是业务 模块请以 10000000 来自增命名
  return (path) => {
    let id = fileToIdMap.get(path);

    if (typeof id !== 'number') {
      id = nextId++;
      fileToIdMap.set(path, id);

      !hasBuildInfo('./config/bundleCommonInfo.json', path) &&
        writeBuildInfo(
          './config/bundleCommonInfo.json',
          path,
          fileToIdMap.get(path)
        );
    }

    return id;
  };
}

const config = {
  serializer: {
    createModuleIdFactory: createModuleIdFactory, // 给 bundle 一个id 避免冲突 cli 源码中这个id 是从1 开始 自增的
  },
};

module.exports = mergeConfig(getDefaultConfig(__dirname), config);