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node_modules/graphql/validation/rules/UniqueDirectivesPerLocation.mjs

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+import { GraphQLError } from '../../error/GraphQLError';
+import { Kind } from '../../language/kinds';
+import { specifiedDirectives } from '../../type/directives';
+export function duplicateDirectiveMessage(directiveName) {
+  return "The directive \"".concat(directiveName, "\" can only be used once at this location.");
+}
+/**
+ * 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 UniqueDirectivesPerLocation(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;
+    }
+  }
+
+  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) {
+      // Flow can't refine that node.directives will only contain directives,
+      // so we cast so the rest of the code is well typed.
+      var directives = node.directives;
+
+      if (directives) {
+        var knownDirectives = Object.create(null);
+
+        for (var _i6 = 0; _i6 < directives.length; _i6++) {
+          var _directive = directives[_i6];
+          var directiveName = _directive.name.value;
+
+          if (uniqueDirectiveMap[directiveName]) {
+            if (knownDirectives[directiveName]) {
+              context.reportError(new GraphQLError(duplicateDirectiveMessage(directiveName), [knownDirectives[directiveName], _directive]));
+            } else {
+              knownDirectives[directiveName] = _directive;
+            }
+          }
+        }
+      }
+    }
+  };
+}