Correct way to return error in custom service through GraphQL

Questions and Answers
9

solution is

updateUser: {
        description: 'Update an existing user',
        resolverOf: 'plugins::users-permissions.user.update',
        resolver: async (obj, options, { context }) => {
          context.params = _.toPlainObject(options.input.where);
          context.request.body = _.toPlainObject(options.input.data);

          await strapi.plugins['users-permissions'].controllers.user.update(context);

          return {
            user: context.body.toJSON ? context.body.toJSON() : context.body,
          };
        },
      },

to

updateUser: {
        description: 'Update an existing user',
        resolverOf: 'plugins::users-permissions.user.update',
        resolver: async (obj, options, { context }) => {
          context.params = _.toPlainObject(options.input.where);
          context.request.body = _.toPlainObject(options.input.data);

          await strapi.plugins['users-permissions'].controllers.user.update(context);
                    let output = context.body.toJSON ? context.body.toJSON() : context.body;

          checkBadRequest(output);

          return {
            user: output,
          };
        },
      },

now you are good to go