graphql/validation/rules/UniqueDirectivesPerLocationRule.mjs

import { GraphQLError } from "../../error/GraphQLError.mjs";
import { Kind } from "../../language/kinds.mjs";
import { isTypeDefinitionNode, isTypeExtensionNode } from "../../language/predicates.mjs";
import { specifiedDirectives } from "../../type/directives.mjs";

/**
 * Unique directive names per location
 *
 * A GraphQL document is only valid if all non-repeatable directives at
 * a given location are uniquely named.
 */
export function UniqueDirectivesPerLocationRule(context) {
  var uniqueDirectiveMap = Object.create(null);
  var schema = context.getSchema();
  var definedDirectives = schema ? schema.getDirectives() : specifiedDirectives;

  for (var _i2 = 0; _i2 < definedDirectives.length; _i2++) {
    var directive = definedDirectives[_i2];
    uniqueDirectiveMap[directive.name] = !directive.isRepeatable;
  }

  var astDefinitions = context.getDocument().definitions;

  for (var _i4 = 0; _i4 < astDefinitions.length; _i4++) {
    var def = astDefinitions[_i4];

    if (def.kind === Kind.DIRECTIVE_DEFINITION) {
      uniqueDirectiveMap[def.name.value] = !def.repeatable;
    }
  }

  var schemaDirectives = Object.create(null);
  var typeDirectivesMap = Object.create(null);
  return {
    // Many different AST nodes may contain directives. Rather than listing
    // them all, just listen for entering any node, and check to see if it
    // defines any directives.
    enter: function enter(node) {
      if (node.directives == null) {
        return;
      }

      var seenDirectives;

      if (node.kind === Kind.SCHEMA_DEFINITION || node.kind === Kind.SCHEMA_EXTENSION) {
        seenDirectives = schemaDirectives;
      } else if (isTypeDefinitionNode(node) || isTypeExtensionNode(node)) {
        var typeName = node.name.value;
        seenDirectives = typeDirectivesMap[typeName];

        if (seenDirectives === undefined) {
          typeDirectivesMap[typeName] = seenDirectives = Object.create(null);
        }
      } else {
        seenDirectives = Object.create(null);
      }

      for (var _i6 = 0, _node$directives2 = node.directives; _i6 < _node$directives2.length; _i6++) {
        var _directive = _node$directives2[_i6];
        var directiveName = _directive.name.value;

        if (uniqueDirectiveMap[directiveName]) {
          if (seenDirectives[directiveName]) {
            context.reportError(new GraphQLError("The directive \"@".concat(directiveName, "\" can only be used once at this location."), [seenDirectives[directiveName], _directive]));
          } else {
            seenDirectives[directiveName] = _directive;
          }
        }
      }
    }
  };
}