Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/UniqueArgumentDefinitionNamesRule.mjs

@@ -0,0 +1,81 @@
+import { groupBy } from '../../jsutils/groupBy.mjs';
+import { GraphQLError } from '../../error/GraphQLError.mjs';
+
+/**
+ * Unique argument definition names
+ *
+ * A GraphQL Object or Interface type is only valid if all its fields have uniquely named arguments.
+ * A GraphQL Directive is only valid if all its arguments are uniquely named.
+ */
+export function UniqueArgumentDefinitionNamesRule(context) {
+  return {
+    DirectiveDefinition(directiveNode) {
+      var _directiveNode$argume;
+
+      // FIXME: https://github.com/graphql/graphql-js/issues/2203
+
+      /* c8 ignore next */
+      const argumentNodes =
+        (_directiveNode$argume = directiveNode.arguments) !== null &&
+        _directiveNode$argume !== void 0
+          ? _directiveNode$argume
+          : [];
+      return checkArgUniqueness(`@${directiveNode.name.value}`, argumentNodes);
+    },
+
+    InterfaceTypeDefinition: checkArgUniquenessPerField,
+    InterfaceTypeExtension: checkArgUniquenessPerField,
+    ObjectTypeDefinition: checkArgUniquenessPerField,
+    ObjectTypeExtension: checkArgUniquenessPerField,
+  };
+
+  function checkArgUniquenessPerField(typeNode) {
+    var _typeNode$fields;
+
+    const typeName = typeNode.name.value; // FIXME: https://github.com/graphql/graphql-js/issues/2203
+
+    /* c8 ignore next */
+
+    const fieldNodes =
+      (_typeNode$fields = typeNode.fields) !== null &&
+      _typeNode$fields !== void 0
+        ? _typeNode$fields
+        : [];
+
+    for (const fieldDef of fieldNodes) {
+      var _fieldDef$arguments;
+
+      const fieldName = fieldDef.name.value; // FIXME: https://github.com/graphql/graphql-js/issues/2203
+
+      /* c8 ignore next */
+
+      const argumentNodes =
+        (_fieldDef$arguments = fieldDef.arguments) !== null &&
+        _fieldDef$arguments !== void 0
+          ? _fieldDef$arguments
+          : [];
+      checkArgUniqueness(`${typeName}.${fieldName}`, argumentNodes);
+    }
+
+    return false;
+  }
+
+  function checkArgUniqueness(parentName, argumentNodes) {
+    const seenArgs = groupBy(argumentNodes, (arg) => arg.name.value);
+
+    for (const [argName, argNodes] of seenArgs) {
+      if (argNodes.length > 1) {
+        context.reportError(
+          new GraphQLError(
+            `Argument "${parentName}(${argName}:)" can only be defined once.`,
+            {
+              nodes: argNodes.map((node) => node.name),
+            },
+          ),
+        );
+      }
+    }
+
+    return false;
+  }
+}