How can I make different generic function in type script?

Question

I have function like this

export const registerResource = <T, H, M, I extends object, R extends object>(serverConfig: IResourceServerConfig<T, H>, option: IRegisterResourceOption<T, H, M, I, R> = {}) => {
...
}

So I will call look like this

registerResource(foo,bar)

But I would like to definition only 2 type T & H like this

registerResource<any, number>(foo,bar)

But it's not work, did I'm doing stupid and how can I resolve that.

Thanks alot

Matt McCutchen · Accepted Answer · 2018-11-01 13:27:05Z

1

If you want to specify T and H at the call site and let the remaining type arguments be inferred, that feature is not currently supported by TypeScript but hopefully it will be soon; see the open suggestion. The current workaround is to change your function into a function with some type parameters that returns a function with the remaining type parameters:

export const registerResource = <T, H>(serverConfig: IResourceServerConfig<T, H>) =>
  <M, I extends object, R extends object>(option: IRegisterResourceOption<T, H, M, I, R> = {}) => {
  // ...
};
registerResource<any, number>(foo)(bar);

(I assume your example was based on real code that is actually using M, I, and R for something, otherwise you could just replace them with {}, object, and object and not have this problem.)

answered Nov 1, 2018 at 13:27

Matt McCutchen

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2 Comments

Tom Le Over a year ago

Thanks, but I think if I change my func into 2 curry func(func => func), It's look weird in my case, 2nd way is also work but it will loose some properties: ` const a = registerResource<IPractitioner, IDataServerResponse<IPractitioner>, any, object, object>(serverConfig, { addResourceProps: (resource) => ({newOne: 1}) }) ` In that case it's will not receive the newOne is also the properties to return a.resource.newOne (not work). Sample code at here: gist.github.com/tomzaku/f46e5341ff82527ff530fc25f8f3e5e8

Matt McCutchen Over a year ago

I don't have another solution to offer at this time than the "weird" currying.

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