subscriptions-transport-ws/dist/validation.js

A websocket transport for GraphQL subscriptions

"use strict";
var graphql_1 = require('graphql');
var FIELD = 'Field';
function tooManySubscriptionFieldsError(subscriptionName) {
    return "Subscription \"" + subscriptionName + "\" must have only one field.";
}
exports.tooManySubscriptionFieldsError = tooManySubscriptionFieldsError;
function subscriptionHasSingleField(context) {
    var schema = context.getSchema();
    schema.getSubscriptionType();
    return {
        OperationDefinition: function (node) {
            var operationName = node.name.value;
            var numFields = 0;
            node.selectionSet.selections.forEach(function (selection) {
                if (selection.kind === FIELD) {
                    numFields++;
                }
                else {
                    context.reportError(new graphql_1.GraphQLError('Apollo subscriptions do not support fragments on the root field', node));
                }
            });
            if (numFields > 1) {
                context.reportError(new graphql_1.GraphQLError(tooManySubscriptionFieldsError(operationName), node));
            }
            return false;
        },
    };
}
exports.subscriptionHasSingleField = subscriptionHasSingleField;
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