graphql/validation/rules/UniqueDirectiveNamesRule.mjs

A Query Language and Runtime which can target any service.

import { GraphQLError } from "../../error/GraphQLError.mjs";
export function UniqueDirectiveNamesRule(context) {
    const knownDirectiveNames = new Map();
    const schema = context.getSchema();
    return {
        DirectiveDefinition(node) {
            const directiveName = node.name.value;
            if (schema?.getDirective(directiveName)) {
                context.reportError(new GraphQLError(`Directive "@${directiveName}" already exists in the schema. It cannot be redefined.`, { nodes: node.name }));
                return;
            }
            const knownName = knownDirectiveNames.get(directiveName);
            if (knownName) {
                context.reportError(new GraphQLError(`There can be only one directive named "@${directiveName}".`, { nodes: [knownName, node.name] }));
            }
            else {
                knownDirectiveNames.set(directiveName, node.name);
            }
            return false;
        },
    };
}
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