graphql/validation/rules/DeferStreamDirectiveLabelRule.mjs

A Query Language and Runtime which can target any service.

import { GraphQLError } from "../../error/GraphQLError.mjs";
import { Kind } from "../../language/kinds.mjs";
import { GraphQLDeferDirective, GraphQLStreamDirective, } from "../../type/directives.mjs";
export function DeferStreamDirectiveLabelRule(context) {
    const knownLabels = new Map();
    return {
        Directive(node) {
            if (node.name.value === GraphQLDeferDirective.name ||
                node.name.value === GraphQLStreamDirective.name) {
                const labelArgument = node.arguments?.find((arg) => arg.name.value === 'label');
                const labelValue = labelArgument?.value;
                if (!labelValue || labelValue.kind === Kind.NULL) {
                    return;
                }
                if (labelValue.kind !== Kind.STRING) {
                    context.reportError(new GraphQLError(`Argument "@${node.name.value}(label:)" must be a static string.`, { nodes: node }));
                    return;
                }
                const knownLabel = knownLabels.get(labelValue.value);
                if (knownLabel != null) {
                    context.reportError(new GraphQLError('Value for arguments "defer(label:)" and "stream(label:)" must be unique across all Defer/Stream directive usages.', { nodes: [knownLabel, node] }));
                }
                else {
                    knownLabels.set(labelValue.value, node);
                }
            }
        },
    };
}
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