[DateTime] - A GraphQL ScalarType for Luxon DateTime

DateTime.ts

import type { GraphQLScalarTypeConfig } from "graphql"; 
import { GraphQLScalarType } from "graphql";
import { DateTimeResolver } from "graphql-scalars";
import { DateTime } from "luxon";

export const GraphQLDateTimeConfig: GraphQLScalarTypeConfig<DateTime, DateTime> =
  {
    name: "DateTime",
    description: "An ISO8601 date-time string represented by a Luxon DateTime instance.",
    
  serialize(value) 
  {
    if (value instanceof DateTime)
    {
      return value;
    }

    const date: Date = DateTimeResolver.serialize(value);
    return DateTime.fromJSDate(date);
  },
    
  parseValue(value) 
  {
    if (value instanceof DateTime)
    {
      return value;
    }

    const date: Date = DateTimeResolver.parseValue(value);
    return DateTime.fromJSDate(date);
  },
  
  parseLiteral(ast) 
  {
    const date: Date = DateTimeResolver.parseLiteral(ast, null);
    return DateTime.fromJSDate(date);
  },
  
  extensions:
  {
    codegenScalarType: "DateTime | string"
  }
};

export const LuxonDateTimeResolver = new GraphQLScalarType(GraphQLDateTimeConfig);