webpack怎么处理没有模块规范的js，比如zepto等

webpack怎么处理没有模块规范的js，比如zepto，zepto-scroll等

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Shimming: https://webpack.github.io/docs/shimming-modules.html
External: https://webpack.github.io/docs/library-and-externals.html
Npm module: https://www.npmjs.com/package/webpack-zepto