TS: sync TS typings with Flow typings

extracted from graphql#2609

src/language/lexer.d.ts

@@ -50,3 +50,8 @@ export class Lexer {
  * @internal
  */
 export function isPunctuatorToken(token: Token): boolean;
+
+/**
+ * @internal
+ */
+export function isPunctuatorTokenKind(kind: TokenKindEnum): boolean;

src/type/definition.d.ts

@@ -335,7 +335,7 @@ export interface GraphQLScalarTypeConfig<TInternal, TExternal> {
   description?: Maybe<string>;
   specifiedByUrl?: Maybe<string>;
   // Serializes an internal value to include in a response.
-  serialize: GraphQLScalarSerializer<TExternal>;
+  serialize?: GraphQLScalarSerializer<TExternal>;
   // Parses an externally provided value to use as an input.
   parseValue?: GraphQLScalarValueParser<TInternal>;
   // Parses an externally provided literal value to use as an input.

src/type/schema.d.ts

@@ -111,7 +111,7 @@ export interface GraphQLSchemaValidationOptions {
 
 export interface GraphQLSchemaConfig extends GraphQLSchemaValidationOptions {
   description?: Maybe<string>;
-  query: Maybe<GraphQLObjectType>;
+  query?: Maybe<GraphQLObjectType>;
   mutation?: Maybe<GraphQLObjectType>;
   subscription?: Maybe<GraphQLObjectType>;
   types?: Maybe<Array<GraphQLNamedType>>;

src/utilities/getIntrospectionQuery.d.ts

@@ -5,7 +5,7 @@ import { DirectiveLocationEnum } from '../language/directiveLocation';
 export interface IntrospectionOptions {
   // Whether to include descriptions in the introspection result.
   // Default: true
-  descriptions: boolean;
+  descriptions?: boolean;
 
   // Whether to include `specifiedByUrl` in the introspection result.
   // Default: false

src/validation/rules/KnownTypeNamesRule.d.ts

@@ -1,10 +1,12 @@
 import { ASTVisitor } from '../../language/visitor';
-import { ValidationContext } from '../ValidationContext';
+import { ValidationContext, SDLValidationContext } from '../ValidationContext';
 
 /**
  * Known type names
  *
  * A GraphQL document is only valid if referenced types (specifically
  * variable definitions and fragment conditions) are defined by the type schema.
  */
-export function KnownTypeNamesRule(context: ValidationContext): ASTVisitor;
+export function KnownTypeNamesRule(
+  context: ValidationContext | SDLValidationContext,
+): ASTVisitor;