Scalars

Custom Scalars

Define custom scalars with GraphQLScalarType from graphql and reference them in your schema. In Axolotl, register them via createScalars (just like createResolvers and createDirectives) and pass to the adapter.

scalars.ts
import { GraphQLScalarType, Kind } from 'graphql';
 
export const DateTime = new GraphQLScalarType({
  name: 'DateTime',
  serialize: (v) => new Date(v as string | number | Date).toISOString(),
  parseValue: (v) => new Date(v as string),
  parseLiteral: (ast) => (ast.kind === Kind.STRING ? new Date(ast.value) : null),
});

Register and wire up with Axolotl:

src/axolotl.ts
import { Axolotl } from '@aexol/axolotl-core';
import { graphqlYogaAdapter } from '@aexol/axolotl-graphql-yoga';
import { Models, Scalars, Directives } from './models.js';
 
export const { createScalars, createResolvers, createDirectives, adapter } = Axolotl(graphqlYogaAdapter)<
  Models,
  Scalars,
  Directives
>();
src/scalars.ts
import { createScalars } from './axolotl.js';
import { DateTime } from './dateTime.js';
 
export default createScalars({
  DateTime,
});
src/index.ts
import { adapter } from './axolotl.js';
import resolvers from './resolvers.js';
import directives from './directives.js';
import scalars from './scalars.js';
 
adapter({ resolvers, directives, scalars }).server.listen(4000);

Add scalar DateTime to your schema. The adapter merges scalars into the schema resolvers and exposes them to your GraphQL server.

Roadmap
Aexol