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现在我有多个未知module，需要共用一个directive，但在定义时需要指定module，我应该怎么定义公共的directive。可以定义一个全局的函数返回directive，但又不想污染全局环境，应该怎么做最合适？
Create a new module directly and define the directive in the module. Wherever you need this directive, can you just declare the dependency in the corresponding module?
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Create a new module directly and define the directive in the module. Wherever you need this directive, can you just declare the dependency in the corresponding module?