问题1

bundling failed: Error: Unable to resolve module /../react-transform-hmr/lib/index.js

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解决方案 卸载Node环境，重新安装

参考链接：https://juejin.im/post/5c09e47ee51d45721d71087d

问题2

更新Xcode11后报错

Unknown argument type 'attribute' in method

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解决方案 在iOS源码中添加一行代码

image.png

static BOOL RCTParseUnused(const char **input)
{
  return RCTReadString(input, "__attribute__((unused))") ||
         RCTReadString(input, "__attribute__((__unused__))") ||
         RCTReadString(input, "__unused");
}

参考链接 : https://github.com/facebook/react-native/pull/25146/files