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diff --git a/school/node_modules/graphql/validation/ValidationContext.js.flow b/school/node_modules/graphql/validation/ValidationContext.js.flow
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+++ b/school/node_modules/graphql/validation/ValidationContext.js.flow
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+// @flow strict
+import type { ObjMap } from '../jsutils/ObjMap';
+
+import type { GraphQLError } from '../error/GraphQLError';
+
+import type { ASTVisitor } from '../language/visitor';
+import type {
+  DocumentNode,
+  OperationDefinitionNode,
+  VariableNode,
+  SelectionSetNode,
+  FragmentSpreadNode,
+  FragmentDefinitionNode,
+} from '../language/ast';
+
+import { Kind } from '../language/kinds';
+import { visit } from '../language/visitor';
+
+import type { GraphQLSchema } from '../type/schema';
+import type { GraphQLDirective } from '../type/directives';
+import type {
+  GraphQLInputType,
+  GraphQLOutputType,
+  GraphQLCompositeType,
+  GraphQLField,
+  GraphQLArgument,
+  GraphQLEnumValue,
+} from '../type/definition';
+
+import { TypeInfo, visitWithTypeInfo } from '../utilities/TypeInfo';
+
+type NodeWithSelectionSet = OperationDefinitionNode | FragmentDefinitionNode;
+type VariableUsage = {|
+  +node: VariableNode,
+  +type: ?GraphQLInputType,
+  +defaultValue: ?mixed,
+|};
+
+/**
+ * An instance of this class is passed as the "this" context to all validators,
+ * allowing access to commonly useful contextual information from within a
+ * validation rule.
+ */
+export class ASTValidationContext {
+  _ast: DocumentNode;
+  _onError: (err: GraphQLError) => void;
+  _fragments: ?ObjMap<FragmentDefinitionNode>;
+  _fragmentSpreads: Map<SelectionSetNode, $ReadOnlyArray<FragmentSpreadNode>>;
+  _recursivelyReferencedFragments: Map<
+    OperationDefinitionNode,
+    $ReadOnlyArray<FragmentDefinitionNode>,
+  >;
+
+  constructor(ast: DocumentNode, onError: (err: GraphQLError) => void) {
+    this._ast = ast;
+    this._fragments = undefined;
+    this._fragmentSpreads = new Map();
+    this._recursivelyReferencedFragments = new Map();
+    this._onError = onError;
+  }
+
+  reportError(error: GraphQLError): void {
+    this._onError(error);
+  }
+
+  getDocument(): DocumentNode {
+    return this._ast;
+  }
+
+  getFragment(name: string): ?FragmentDefinitionNode {
+    let fragments = this._fragments;
+    if (!fragments) {
+      this._fragments = fragments = this.getDocument().definitions.reduce(
+        (frags, statement) => {
+          if (statement.kind === Kind.FRAGMENT_DEFINITION) {
+            frags[statement.name.value] = statement;
+          }
+          return frags;
+        },
+        Object.create(null),
+      );
+    }
+    return fragments[name];
+  }
+
+  getFragmentSpreads(
+    node: SelectionSetNode,
+  ): $ReadOnlyArray<FragmentSpreadNode> {
+    let spreads = this._fragmentSpreads.get(node);
+    if (!spreads) {
+      spreads = [];
+      const setsToVisit: Array<SelectionSetNode> = [node];
+      while (setsToVisit.length !== 0) {
+        const set = setsToVisit.pop();
+        for (const selection of set.selections) {
+          if (selection.kind === Kind.FRAGMENT_SPREAD) {
+            spreads.push(selection);
+          } else if (selection.selectionSet) {
+            setsToVisit.push(selection.selectionSet);
+          }
+        }
+      }
+      this._fragmentSpreads.set(node, spreads);
+    }
+    return spreads;
+  }
+
+  getRecursivelyReferencedFragments(
+    operation: OperationDefinitionNode,
+  ): $ReadOnlyArray<FragmentDefinitionNode> {
+    let fragments = this._recursivelyReferencedFragments.get(operation);
+    if (!fragments) {
+      fragments = [];
+      const collectedNames = Object.create(null);
+      const nodesToVisit: Array<SelectionSetNode> = [operation.selectionSet];
+      while (nodesToVisit.length !== 0) {
+        const node = nodesToVisit.pop();
+        for (const spread of this.getFragmentSpreads(node)) {
+          const fragName = spread.name.value;
+          if (collectedNames[fragName] !== true) {
+            collectedNames[fragName] = true;
+            const fragment = this.getFragment(fragName);
+            if (fragment) {
+              fragments.push(fragment);
+              nodesToVisit.push(fragment.selectionSet);
+            }
+          }
+        }
+      }
+      this._recursivelyReferencedFragments.set(operation, fragments);
+    }
+    return fragments;
+  }
+}
+
+export type ASTValidationRule = (ASTValidationContext) => ASTVisitor;
+
+export class SDLValidationContext extends ASTValidationContext {
+  _schema: ?GraphQLSchema;
+
+  constructor(
+    ast: DocumentNode,
+    schema: ?GraphQLSchema,
+    onError: (err: GraphQLError) => void,
+  ) {
+    super(ast, onError);
+    this._schema = schema;
+  }
+
+  getSchema(): ?GraphQLSchema {
+    return this._schema;
+  }
+}
+
+export type SDLValidationRule = (SDLValidationContext) => ASTVisitor;
+
+export class ValidationContext extends ASTValidationContext {
+  _schema: GraphQLSchema;
+  _typeInfo: TypeInfo;
+  _variableUsages: Map<NodeWithSelectionSet, $ReadOnlyArray<VariableUsage>>;
+  _recursiveVariableUsages: Map<
+    OperationDefinitionNode,
+    $ReadOnlyArray<VariableUsage>,
+  >;
+
+  constructor(
+    schema: GraphQLSchema,
+    ast: DocumentNode,
+    typeInfo: TypeInfo,
+    onError: (err: GraphQLError) => void,
+  ) {
+    super(ast, onError);
+    this._schema = schema;
+    this._typeInfo = typeInfo;
+    this._variableUsages = new Map();
+    this._recursiveVariableUsages = new Map();
+  }
+
+  getSchema(): GraphQLSchema {
+    return this._schema;
+  }
+
+  getVariableUsages(node: NodeWithSelectionSet): $ReadOnlyArray<VariableUsage> {
+    let usages = this._variableUsages.get(node);
+    if (!usages) {
+      const newUsages = [];
+      const typeInfo = new TypeInfo(this._schema);
+      visit(
+        node,
+        visitWithTypeInfo(typeInfo, {
+          VariableDefinition: () => false,
+          Variable(variable) {
+            newUsages.push({
+              node: variable,
+              type: typeInfo.getInputType(),
+              defaultValue: typeInfo.getDefaultValue(),
+            });
+          },
+        }),
+      );
+      usages = newUsages;
+      this._variableUsages.set(node, usages);
+    }
+    return usages;
+  }
+
+  getRecursiveVariableUsages(
+    operation: OperationDefinitionNode,
+  ): $ReadOnlyArray<VariableUsage> {
+    let usages = this._recursiveVariableUsages.get(operation);
+    if (!usages) {
+      usages = this.getVariableUsages(operation);
+      for (const frag of this.getRecursivelyReferencedFragments(operation)) {
+        usages = usages.concat(this.getVariableUsages(frag));
+      }
+      this._recursiveVariableUsages.set(operation, usages);
+    }
+    return usages;
+  }
+
+  getType(): ?GraphQLOutputType {
+    return this._typeInfo.getType();
+  }
+
+  getParentType(): ?GraphQLCompositeType {
+    return this._typeInfo.getParentType();
+  }
+
+  getInputType(): ?GraphQLInputType {
+    return this._typeInfo.getInputType();
+  }
+
+  getParentInputType(): ?GraphQLInputType {
+    return this._typeInfo.getParentInputType();
+  }
+
+  getFieldDef(): ?GraphQLField<mixed, mixed> {
+    return this._typeInfo.getFieldDef();
+  }
+
+  getDirective(): ?GraphQLDirective {
+    return this._typeInfo.getDirective();
+  }
+
+  getArgument(): ?GraphQLArgument {
+    return this._typeInfo.getArgument();
+  }
+
+  getEnumValue(): ?GraphQLEnumValue {
+    return this._typeInfo.getEnumValue();
+  }
+}
+
+export type ValidationRule = (ValidationContext) => ASTVisitor;