ts: use typeof instead of private types

src/language/directiveLocation.d.ts

@@ -1,12 +1,7 @@
 /**
  * The set of allowed directive location values.
  */
-export const DirectiveLocation: _DirectiveLocation;
-
-/**
- * @internal
- */
-type _DirectiveLocation = {
+export const DirectiveLocation: {
   // Request Definitions
   QUERY: 'QUERY';
   MUTATION: 'MUTATION';
@@ -34,4 +29,4 @@ type _DirectiveLocation = {
 /**
  * The enum type representing the directive location values.
  */
-export type DirectiveLocationEnum = _DirectiveLocation[keyof _DirectiveLocation];
+export type DirectiveLocationEnum = typeof DirectiveLocation[keyof typeof DirectiveLocation];

src/language/kinds.d.ts

@@ -1,12 +1,7 @@
 /**
  * The set of allowed kind values for AST nodes.
  */
-export const Kind: _Kind;
-
-/**
- * @internal
- */
-type _Kind = {
+export const Kind: {
   // Name
   NAME: 'Name';
 
@@ -76,4 +71,4 @@ type _Kind = {
 /**
  * The enum type representing the possible kind values of AST nodes.
  */
-export type KindEnum = _Kind[keyof _Kind];
+export type KindEnum = typeof Kind[keyof typeof Kind];

src/language/tokenKind.d.ts

@@ -2,9 +2,7 @@
  * An exported enum describing the different kinds of tokens that the
  * lexer emits.
  */
-export const TokenKind: _TokenKind;
-
-type _TokenKind = {
+export const TokenKind: {
   SOF: '<SOF>';
   EOF: '<EOF>';
   BANG: '!';
@@ -32,4 +30,4 @@ type _TokenKind = {
 /**
  * The enum type representing the token kinds values.
  */
-export type TokenKindEnum = _TokenKind[keyof _TokenKind];
+export type TokenKindEnum = typeof TokenKind[keyof typeof TokenKind];

src/utilities/findBreakingChanges.d.ts

@@ -1,11 +1,6 @@
 import { GraphQLSchema } from '../type/schema';
 
-export const BreakingChangeType: _BreakingChangeType;
-
-/**
- * @internal
- */
-type _BreakingChangeType = {
+export const BreakingChangeType: {
   TYPE_REMOVED: 'TYPE_REMOVED';
   TYPE_CHANGED_KIND: 'TYPE_CHANGED_KIND';
   TYPE_REMOVED_FROM_UNION: 'TYPE_REMOVED_FROM_UNION';
@@ -24,12 +19,7 @@ type _BreakingChangeType = {
   DIRECTIVE_LOCATION_REMOVED: 'DIRECTIVE_LOCATION_REMOVED';
 };
 
-export const DangerousChangeType: _DangerousChangeType;
-
-/**
- * @internal
- */
-type _DangerousChangeType = {
+export const DangerousChangeType: {
   VALUE_ADDED_TO_ENUM: 'VALUE_ADDED_TO_ENUM';
   TYPE_ADDED_TO_UNION: 'TYPE_ADDED_TO_UNION';
   OPTIONAL_INPUT_FIELD_ADDED: 'OPTIONAL_INPUT_FIELD_ADDED';
@@ -39,12 +29,12 @@ type _DangerousChangeType = {
 };
 
 export interface BreakingChange {
-  type: keyof _BreakingChangeType;
+  type: keyof typeof BreakingChangeType;
   description: string;
 }
 
 export interface DangerousChange {
-  type: keyof _DangerousChangeType;
+  type: keyof typeof DangerousChangeType;
   description: string;
 }