``` main: cjs（推荐）npm发布的输出文件 module: 指定 ESModule 模块的入口文件 browser:UMD 规范，当直接在浏览器中开发时 注意：webpack 的 Resolve 机制会默认优先识别 browser 字段也就是 umd 规范。所以是不建议配置 browser 字段，而是通过其他方式来实现 umd 。 files:约定 NPM 发包时包含的文件和文件夹 files指的是上传到npmjs仓库，以及别人下载具体包含哪些文件，
Utility for getting a function's name for node and the browser
Utilities to help with endpoint resolution
The `util.is*` functions introduced in Node v0.12.
[](https://www.npmjs.com/package/@aws-sdk/util-locate-window) [](https://www.npmjs.com/packag
unist utility to visit nodes
Node.js's util module for all engines
A parser to Amazon Resource Names
unist utility to recursively walk over nodes, with ancestral information
unist utility to serialize a node, position, or point as a human readable location
unist utility to check if a node passes a test
Utility functions
mdast utility to serialize markdown
mdast utility to get the plain text content of a node
[](https://www.npmjs.com/package/@aws-sdk/util-user-agent-node) [](https://www.npmjs.com/
unist utility to get the position of a node
mdast utility to transform to hast
hast utility to check if a node is inter-element whitespace
mdast utility to check if a node is phrasing content
mdast extension to parse and serialize GFM task list items
Various helper utilities
mdast utility to parse markdown
hast utility to create an element from a simple CSS selector
mdast extension to parse and serialize GFM strikethrough