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Discussion on: Creating a typed "compose" function in TypeScript

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Ran Lottem

Great stuff! I played around with a ComposableOn type, to implement compose for different types:

type FunctionType = (...x: any[]) => any;
type ComposableOn<F extends FunctionType> = F extends (...x: any[]) => infer U ? (y: U) => any : never;

This enforces that a function f2 can be composed on f1 to give f2(f1(...args).

Still couldn't do anything too cool about a variadic implementation. Something like CPP's <typename... T> or any of the other suggestions in comments here would be really cool.

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