记录 各个配置对应的源码位置

preset-umi

别名 alias

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// packages\preset-umi\src\features\configPlugins\configPlugins.ts
 alias: {
      umi: '@@/exports',
      react:...,
    },

memo.alias = {
  ...memo.alias,
  '@': args.paths.absSrcPath,
  '@@': args.paths.absTmpPath,
};

文件生成

packages\preset-umi\src\features\tmpFiles\tmpFiles.ts