Named type argument

[tinganho]

A spin-off idea from #2175. If a class has many type parameters and let say that default type parameter gets landed. And If I have a class with three type parameters like below:

class CustomComponent<P, S, E> extends React.Component<P = {}, S = {}, E = {}> {
}

Now, I just want to assign a type to one of the type parameter S:

 new CustomComponent<{}, { a: string }, {}>;

The above solution is quite redundant since you need to assign a type to the type parameters P and E too. When in fact, you just want to assign a type to the type parameter S.

I suggest named type argument to solve this problem:

 new CustomComponent<S = { a: string }>;

In the above solution, I don't need to assign any type to the type parameters P and E.

[mhegazy]

this looks like a syntax proposal for the implementation of #2175. if you agree, i would keep it in #2175, instead of a separate issue.

[tinganho]

OK I its fine.

On Fri, Oct 2, 2015, 02:10 Mohamed Hegazy notifications@github.com wrote:

this looks like a syntax proposal for the implementation of #2175
#2175. if you agree, i
would keep it in #2175
#2175, instead of a
separate issue.

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#5053 (comment)
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[mhegazy]

thanks!

[tinganho]

@mhegazy shouldn't this issue be reopnened, since the PR #13487 is mentioning that it fixes #2175, but does not include named type argument?

[tinganho]

@mhegazy can you revisit this? I think you miss a lot if you just have #2175 and not this one.