在项目根目录下创建一个名为metro.config.js的文件，并添加以下内容：

const { getDefaultConfig } = require('expo/metro-config');
const defaultConfig = getDefaultConfig(__dirname);

defaultConfig.resolver = {
  ...defaultConfig.resolver,
  extraNodeModules: {
    ...defaultConfig.resolver.extraNodeModules,
    '@aws-sdk/client-pinpoint': require.resolve('@aws-sdk/client-pinpoint'),
    '@aws-sdk/client-cognito-identity': require.resolve('@aws-sdk/client-cognito-identity'),
    '@aws-sdk/util-base64-browser': require.resolve('@aws-sdk/util-base64-browser'),
    '@aws-sdk/util-create-request-browser': require.resolve('@aws-sdk/util-create-request-browser'),
    '@aws-sdk/util-js': require.resolve('@aws-sdk/util-js'),
  },
};

module.exports = defaultConfig;

这将为Expo项目的Metro构建配置添加AWS Amplify所需的依赖项，并允许成功构建AWS Amplify客户端。