函数签名
https://en.wikipedia.org/wiki/Type_signature
MDN
https://developer.mozilla.org/en-US/docs/Glossary/Signature/Function
https://developer.mozilla.org/en-US/docs/Glossary/Function
https://developer.mozilla.org/en-US/docs/Glossary/Method
TS
Python
https://www.zhihu.com/question/51083637
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