add constraint to all GraphQl Schema Elements

Author: yaacovCR

src/type/definition.ts

@@ -365,7 +365,9 @@ export function assertAbstractType(type: unknown): GraphQLAbstractType {
  * })
  * ```
  */
-export class GraphQLList<T extends GraphQLType> {
+export class GraphQLList<T extends GraphQLType>
+  implements GraphQLSchemaElement
+{
   readonly ofType: T;
 
   constructor(ofType: T) {
@@ -406,7 +408,9 @@ export class GraphQLList<T extends GraphQLType> {
  * ```
  * Note: the enforcement of non-nullability occurs within the executor.
  */
-export class GraphQLNonNull<T extends GraphQLNullableType> {
+export class GraphQLNonNull<T extends GraphQLNullableType>
+  implements GraphQLSchemaElement
+{
   readonly ofType: T;
 
   constructor(ofType: T) {
@@ -530,6 +534,15 @@ export function getNamedType(
   }
 }
 
+/**
+ * An interface for all Schema Elements.
+ */
+
+export interface GraphQLSchemaElement {
+  toString: () => string;
+  toJSON: () => string;
+}
+
 /**
  * Used while defining GraphQL types to allow for circular references in
  * otherwise immutable type definitions.
@@ -635,7 +648,9 @@ export interface GraphQLScalarTypeExtensions {
  *    `coerceInputLiteral()` method.
  *
  */
-export class GraphQLScalarType<TInternal = unknown, TExternal = TInternal> {
+export class GraphQLScalarType<TInternal = unknown, TExternal = TInternal>
+  implements GraphQLSchemaElement
+{
   name: string;
   description: Maybe<string>;
   specifiedByURL: Maybe<string>;
@@ -851,7 +866,9 @@ export interface GraphQLObjectTypeExtensions<_TSource = any, _TContext = any> {
  * });
  * ```
  */
-export class GraphQLObjectType<TSource = any, TContext = any> {
+export class GraphQLObjectType<TSource = any, TContext = any>
+  implements GraphQLSchemaElement
+{
   name: string;
   description: Maybe<string>;
   isTypeOf: Maybe<GraphQLIsTypeOfFn<TSource, TContext>>;
@@ -1054,7 +1071,9 @@ export type GraphQLFieldConfigMap<TSource, TContext> = ObjMap<
   GraphQLFieldConfig<TSource, TContext>
 >;
 
-export class GraphQLField<TSource = any, TContext = any, TArgs = any> {
+export class GraphQLField<TSource = any, TContext = any, TArgs = any>
+  implements GraphQLSchemaElement
+{
   parentType:
     | GraphQLObjectType<TSource, TContext>
     | GraphQLInterfaceType<TSource, TContext>
@@ -1127,7 +1146,7 @@ export class GraphQLField<TSource = any, TContext = any, TArgs = any> {
   }
 }
 
-export class GraphQLArgument {
+export class GraphQLArgument implements GraphQLSchemaElement {
   parent: GraphQLField | GraphQLDirective;
   name: string;
   description: Maybe<string>;
@@ -1239,7 +1258,9 @@ export interface GraphQLInterfaceTypeExtensions {
  * });
  * ```
  */
-export class GraphQLInterfaceType<TSource = any, TContext = any> {
+export class GraphQLInterfaceType<TSource = any, TContext = any>
+  implements GraphQLSchemaElement
+{
   name: string;
   description: Maybe<string>;
   resolveType: Maybe<GraphQLTypeResolver<TSource, TContext>>;
@@ -1366,7 +1387,7 @@ export interface GraphQLUnionTypeExtensions {
  * });
  * ```
  */
-export class GraphQLUnionType {
+export class GraphQLUnionType implements GraphQLSchemaElement {
   name: string;
   description: Maybe<string>;
   resolveType: Maybe<GraphQLTypeResolver<any, any>>;
@@ -1483,7 +1504,7 @@ export interface GraphQLEnumTypeExtensions {
  * Note: If a value is not provided in a definition, the name of the enum value
  * will be used as its internal value.
  */
-export class GraphQLEnumType /* <T> */ {
+export class GraphQLEnumType /* <T> */ implements GraphQLSchemaElement {
   name: string;
   description: Maybe<string>;
   extensions: Readonly<GraphQLEnumTypeExtensions>;
@@ -1703,7 +1724,7 @@ export interface GraphQLEnumValueConfig {
   astNode?: Maybe<EnumValueDefinitionNode>;
 }
 
-export class GraphQLEnumValue {
+export class GraphQLEnumValue implements GraphQLSchemaElement {
   parentEnum: GraphQLEnumType;
   name: string;
   description: Maybe<string>;
@@ -1783,7 +1804,7 @@ export interface GraphQLInputObjectTypeExtensions {
  * });
  * ```
  */
-export class GraphQLInputObjectType {
+export class GraphQLInputObjectType implements GraphQLSchemaElement {
   name: string;
   description: Maybe<string>;
   extensions: Readonly<GraphQLInputObjectTypeExtensions>;
@@ -1890,7 +1911,7 @@ export interface GraphQLInputFieldConfig {
 
 export type GraphQLInputFieldConfigMap = ObjMap<GraphQLInputFieldConfig>;
 
-export class GraphQLInputField {
+export class GraphQLInputField implements GraphQLSchemaElement {
   parentType: GraphQLInputObjectType;
   name: string;
   description: Maybe<string>;

src/type/directives.ts

@@ -11,7 +11,10 @@ import type { DirectiveDefinitionNode } from '../language/ast.js';
 import { DirectiveLocation } from '../language/directiveLocation.js';
 
 import { assertName } from './assertName.js';
-import type { GraphQLArgumentConfig } from './definition.js';
+import type {
+  GraphQLArgumentConfig,
+  GraphQLSchemaElement,
+} from './definition.js';
 import { GraphQLArgument, GraphQLNonNull } from './definition.js';
 import { GraphQLBoolean, GraphQLInt, GraphQLString } from './scalars.js';
 
@@ -48,7 +51,7 @@ export interface GraphQLDirectiveExtensions {
  * Directives are used by the GraphQL runtime as a way of modifying execution
  * behavior. Type system creators will usually not create these directly.
  */
-export class GraphQLDirective {
+export class GraphQLDirective implements GraphQLSchemaElement {
   name: string;
   description: Maybe<string>;
   locations: ReadonlyArray<DirectiveLocation>;