Imagine you need to change the result of a function:
(bob: Bob) => R
=>
(bob: Bob) => R2
Is it possible to achieve this without changing the argument name? (e.g bob instead of using a general name like a)
Imagine you need to change the result of a function:
(bob: Bob) => R
=>
(bob: Bob) => R2
Is it possible to achieve this without changing the argument name? (e.g bob instead of using a general name like a)
To maintain the parameter names displayed by code completion, there is currently no syntactic method to ensure their preservation. One way to map arguments effectively is by using tuples with the tuples in rest parameters feature in version 3.0. Tuples are positional and do not have individual names for items within the tuple; only the position matters.
However, TypeScript does retain the original name of a parameter when mapping a function using this feature, although it may not consistently display this information. For example:
class Bob { }
let fn : (bob: Bob) => string
type Arguments<T extends (...a:any[])=> any> = T extends (...a:infer A)=> any ? A: []
function trasform<T extends (...a: any[]) => any>(inFn: T): (...a: Arguments<T>) => number {
return null as any;
}
let fnOut = trasform(fn);
fnOut(new Bob)
If you hover over fnOut, you will see the original parameter names:
When opening a (, only the tuple type will be displayed:
An existing GitHub issue addresses this behavior, so consider supporting it if you seek an enhancement in this aspect.
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