I see a way of writing in other people"s blogs that makes me confused. I can"t understand it. Can you tell me what version of grammar this is in ES? I only know ES6
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instance method name followed by < T >, mapper: (doc:object) = > T): promise.. in the method parameters Two colons are concatenated to indicate that they do not understand
this should be the syntax of typescript and requires the compilation environment corresponding to typescript. But node is not enough
keywords: static type checking TypeScript flow
if you haven't seen this syntax before, you can take a look at TypeScript
< T > search < string > () pass in type
< T > . : Promise is the type of value returned by the method
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