How to add type bindings to graphql resolver mappings

Question

Is there a standard way of adding type bindings to a graphql resolver mapping?

sampleResolver.ts:

export default {
  sampleResolver: (parent, args, context, info) => {
    ...
    return ...
  }
};

e.g.

sampleResolver<...>: (parent, args, context, info) => ...

or

sampleResolver: (parent, args, context, info): ... => ...

or

sampleResolver: (parent: ..., args: ..., context:..., info:...) => ...

(As in Apollo's / graphql-tools's resolver map?)

David Maze
– David Maze

2019-12-15 02:53:05 +00:00
Commented Dec 15, 2019 at 2:53 — David Maze
– David Maze, Commented Dec 15, 2019 at 2:53
Are you using Express along with Apollo GrapHQL?

KingDarBoja
– KingDarBoja

2019-12-15 17:48:26 +00:00
Commented Dec 15, 2019 at 17:48 — KingDarBoja
– KingDarBoja, Commented Dec 15, 2019 at 17:48
@KingDarBoja, yes I am using apollo-server-express.

Jimmy
– Jimmy

2019-12-15 20:48:29 +00:00
Commented Dec 15, 2019 at 20:48 — Jimmy
– Jimmy, Commented Dec 15, 2019 at 20:48

KingDarBoja · Accepted Answer · 2019-12-16 13:17:37Z

2

+50

I don't think apollo-server-express has implemented type definitions for resolvers as seen on this issue. However, you could try graphql-code-generator to automatically generate type definitions for you schemas, resolvers and so on.

answered Dec 16, 2019 at 13:17

KingDarBoja

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Lam Nguyen · Accepted Answer · 2019-12-15 02:43:30Z

0

There are multiple ways to do that, see more. In your case i think this would be suitable:

sampleResolver.ts:

// Interface checking for return
export interface SampleResolver {
  [name: string]: any
}

// Then assign Interface at return
export default {
  sampleResolver: (parent, args, context, info) => {
    ...
    return <SampleResolver>...
  }
};

Note: The export is used for type checking in other files.

otherFiles.ts

import { SampleResolver } from 'sampleResolver';


var response: SampleResolver;

answered Dec 15, 2019 at 2:43

Lam Nguyen

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