Scalars

Baeta provides support for custom GraphQL scalars to handle specific data types like DateTime or UUID.

Configuration

First, define your scalars in your baeta.ts configuration file:

export default defineConfig({
  graphql: {
    schemas: ["src/**/*.gql"],
    scalars: {
      DateTime: "Date", // Built-in JavaScript Date
      UUID: "src/types/scalars.ts#UUID", // Custom type
    },
  },
  // ... rest of config
});

Schema Definition

Define your scalars in your GraphQL schema src/modules/scalars/scalars.gql:

scalar DateTime
scalar UUID

Implementation

Implement the scalar resolvers using graphql-scalars or your own implementation src/modules/scalars/resolvers.ts:

import { DateTimeResolver, UUIDResolver } from "graphql-scalars";
import { getScalarsModule } from "./typedef.ts";

const { Scalar } = getScalarsModule();

Scalar.DateTime(DateTimeResolver);
Scalar.UUID(UUIDResolver);

Usage in Resolvers

The scalars are automatically typed in your resolvers:

const { Query } = getUserModule();

Query.user(({ args }) => {
  // args.id is typed as UUID
  // return type createdAt is typed as Date
  return {
    id: args.id,
    createdAt: new Date(),
  };
});

Type Safety

Baeta ensures type safety between your GraphQL schema and TypeScript code:

interface User {
  id: UUID; // Custom type
  createdAt: Date; // JavaScript Date
  email: string; // Regular field
}

Built-in Scalars

Baeta supports several common scalar types out of the box:

• Int
• Float
• String
• Boolean
• ID

These don't require any additional configuration.