That's a nice question!
You're right. JavaScript is not strongly an object-oriented language and it does not have interfaces. And AFAIK, there's no real way of creating a contract like that in JavaScript.
Also, JavaScript is not statically-typed. So, even if you had interfaces, you could only check for the existence of functions. And not for their return-types or their parameters.
You may use TypeScript though. It supports interfaces, type-checking and works with existing JS code.
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That's a nice question!
You're right. JavaScript is not strongly an object-oriented language and it does not have interfaces. And AFAIK, there's no real way of creating a contract like that in JavaScript.
Also, JavaScript is not statically-typed. So, even if you had interfaces, you could only check for the existence of functions. And not for their return-types or their parameters.
You may use TypeScript though. It supports interfaces, type-checking and works with existing JS code.