GraphQL enum - https://atheros.ai/blog/how-to-use-graphql-enum-type-and-its-best-practices

create_task_state_enum.ts

import {
    GraphQLString,
    GraphQLInputObjectType,
    GraphQLNonNull,
    GraphQLBoolean,
    GraphQLInt,
    GraphQLFloat,
} from 'graphql';
import TaskStateEnum from './TaskStateEnumType';
import DateTime from '../custom-scalars/DateTime';
const CreateTaskInputType = new GraphQLInputObjectType({
    name: 'CreateTaskInput',
    fields: () => ({
        name: {
            type: new GraphQLNonNull(GraphQLString),
        },
        completed: {
            type: GraphQLBoolean,
            defaultValue: false,
        },
        state: {
            type: TaskStateEnum,
            defaultValue: TaskStateEnum.getValue("ASSIGNED"),
        },
        taskPriority: {
            type: GraphQLInt,
            defaultValue: 1,
        },
        progress: {
            type: GraphQLFloat,
            defaultValue: 0,
        },
        dueDate: {
            type: DateTime,
        },
    }),
});
export default CreateTaskInputType;