Relay global id input type

relayGlobalID.js

import { GraphQLNonNull } from 'graphql';
import { fromGlobalId } from 'graphql-relay';

export const RelayGlobalID = new GraphQLScalarType({
  name: 'RelayGlobalID',
  description: 'The RelayGlobalID scalar type represents a globalIdField in relay.',
  serialize(value) { 
    return value;
  },
  parseValue(value) {
    // parse the local id from global id
    try {
      return fromGlobalId(value).id;
    } catch (error) {
      throw new GraphQLError('Invalid global id format.');
    }
  },
  parseLiteral(ast) {
    // parse the local id from global id
    try {
      return fromGlobalId(ast.value).id;
    } catch (error) {
      throw new GraphQLError('Invalid global id format.');
    }
  }
});

// Example usage
const deleteCommentMutation = {
  type: CommentType,
  description: 'Delete a comment with id and return the comment that was deleted.',
  args: {
    id: {
      type: new GraphQLNonNull(RelayGlobalID),
      description: 'The globalId of the comment.',
    }
  },
  resolve: (value, { id }) => {
    // `id` here will be the real id. not the global id
    return CommentService.delete(id);
  }
}