Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/KnownDirectivesRule.mjs

@@ -0,0 +1,150 @@
+import { inspect } from '../../jsutils/inspect.mjs';
+import { invariant } from '../../jsutils/invariant.mjs';
+import { GraphQLError } from '../../error/GraphQLError.mjs';
+import { OperationTypeNode } from '../../language/ast.mjs';
+import { DirectiveLocation } from '../../language/directiveLocation.mjs';
+import { Kind } from '../../language/kinds.mjs';
+import { specifiedDirectives } from '../../type/directives.mjs';
+
+/**
+ * Known directives
+ *
+ * A GraphQL document is only valid if all `@directives` are known by the
+ * schema and legally positioned.
+ *
+ * See https://spec.graphql.org/draft/#sec-Directives-Are-Defined
+ */
+export function KnownDirectivesRule(context) {
+  const locationsMap = Object.create(null);
+  const schema = context.getSchema();
+  const definedDirectives = schema
+    ? schema.getDirectives()
+    : specifiedDirectives;
+
+  for (const directive of definedDirectives) {
+    locationsMap[directive.name] = directive.locations;
+  }
+
+  const astDefinitions = context.getDocument().definitions;
+
+  for (const def of astDefinitions) {
+    if (def.kind === Kind.DIRECTIVE_DEFINITION) {
+      locationsMap[def.name.value] = def.locations.map((name) => name.value);
+    }
+  }
+
+  return {
+    Directive(node, _key, _parent, _path, ancestors) {
+      const name = node.name.value;
+      const locations = locationsMap[name];
+
+      if (!locations) {
+        context.reportError(
+          new GraphQLError(`Unknown directive "@${name}".`, {
+            nodes: node,
+          }),
+        );
+        return;
+      }
+
+      const candidateLocation = getDirectiveLocationForASTPath(ancestors);
+
+      if (candidateLocation && !locations.includes(candidateLocation)) {
+        context.reportError(
+          new GraphQLError(
+            `Directive "@${name}" may not be used on ${candidateLocation}.`,
+            {
+              nodes: node,
+            },
+          ),
+        );
+      }
+    },
+  };
+}
+
+function getDirectiveLocationForASTPath(ancestors) {
+  const appliedTo = ancestors[ancestors.length - 1];
+  'kind' in appliedTo || invariant(false);
+
+  switch (appliedTo.kind) {
+    case Kind.OPERATION_DEFINITION:
+      return getDirectiveLocationForOperation(appliedTo.operation);
+
+    case Kind.FIELD:
+      return DirectiveLocation.FIELD;
+
+    case Kind.FRAGMENT_SPREAD:
+      return DirectiveLocation.FRAGMENT_SPREAD;
+
+    case Kind.INLINE_FRAGMENT:
+      return DirectiveLocation.INLINE_FRAGMENT;
+
+    case Kind.FRAGMENT_DEFINITION:
+      return DirectiveLocation.FRAGMENT_DEFINITION;
+
+    case Kind.VARIABLE_DEFINITION:
+      return DirectiveLocation.VARIABLE_DEFINITION;
+
+    case Kind.SCHEMA_DEFINITION:
+    case Kind.SCHEMA_EXTENSION:
+      return DirectiveLocation.SCHEMA;
+
+    case Kind.SCALAR_TYPE_DEFINITION:
+    case Kind.SCALAR_TYPE_EXTENSION:
+      return DirectiveLocation.SCALAR;
+
+    case Kind.OBJECT_TYPE_DEFINITION:
+    case Kind.OBJECT_TYPE_EXTENSION:
+      return DirectiveLocation.OBJECT;
+
+    case Kind.FIELD_DEFINITION:
+      return DirectiveLocation.FIELD_DEFINITION;
+
+    case Kind.INTERFACE_TYPE_DEFINITION:
+    case Kind.INTERFACE_TYPE_EXTENSION:
+      return DirectiveLocation.INTERFACE;
+
+    case Kind.UNION_TYPE_DEFINITION:
+    case Kind.UNION_TYPE_EXTENSION:
+      return DirectiveLocation.UNION;
+
+    case Kind.ENUM_TYPE_DEFINITION:
+    case Kind.ENUM_TYPE_EXTENSION:
+      return DirectiveLocation.ENUM;
+
+    case Kind.ENUM_VALUE_DEFINITION:
+      return DirectiveLocation.ENUM_VALUE;
+
+    case Kind.INPUT_OBJECT_TYPE_DEFINITION:
+    case Kind.INPUT_OBJECT_TYPE_EXTENSION:
+      return DirectiveLocation.INPUT_OBJECT;
+
+    case Kind.INPUT_VALUE_DEFINITION: {
+      const parentNode = ancestors[ancestors.length - 3];
+      'kind' in parentNode || invariant(false);
+      return parentNode.kind === Kind.INPUT_OBJECT_TYPE_DEFINITION
+        ? DirectiveLocation.INPUT_FIELD_DEFINITION
+        : DirectiveLocation.ARGUMENT_DEFINITION;
+    }
+    // Not reachable, all possible types have been considered.
+
+    /* c8 ignore next */
+
+    default:
+      false || invariant(false, 'Unexpected kind: ' + inspect(appliedTo.kind));
+  }
+}
+
+function getDirectiveLocationForOperation(operation) {
+  switch (operation) {
+    case OperationTypeNode.QUERY:
+      return DirectiveLocation.QUERY;
+
+    case OperationTypeNode.MUTATION:
+      return DirectiveLocation.MUTATION;
+
+    case OperationTypeNode.SUBSCRIPTION:
+      return DirectiveLocation.SUBSCRIPTION;
+  }
+}