Update index import paths to be more explicit

Author: lukejacksonn

src/index.js

@@ -125,7 +125,7 @@ export {
   // Validate GraphQL schema.
   validateSchema,
   assertValidSchema,
-} from './type';
+} from './type/index';
 
 export type {
   GraphQLType,
@@ -168,7 +168,7 @@ export type {
   GraphQLScalarSerializer,
   GraphQLScalarValueParser,
   GraphQLScalarLiteralParser,
-} from './type';
+} from './type/index';
 
 // Parse and operate on GraphQL language source files.
 export {
@@ -204,7 +204,7 @@ export {
   isTypeDefinitionNode,
   isTypeSystemExtensionNode,
   isTypeExtensionNode,
-} from './language';
+} from './language/index';
 
 export type {
   ParseOptions,
@@ -276,7 +276,7 @@ export type {
   UnionTypeExtensionNode,
   EnumTypeExtensionNode,
   InputObjectTypeExtensionNode,
-} from './language';
+} from './language/index';
 
 // Execute GraphQL queries.
 export {
@@ -285,12 +285,12 @@ export {
   defaultTypeResolver,
   responsePathAsArray,
   getDirectiveValues,
-} from './execution';
+} from './execution/index';
 
-export type { ExecutionArgs, ExecutionResult } from './execution';
+export type { ExecutionArgs, ExecutionResult } from './execution/index';
 
-export { subscribe, createSourceEventStream } from './subscription';
-export type { SubscriptionArgs } from './subscription';
+export { subscribe, createSourceEventStream } from './subscription/index';
+export type { SubscriptionArgs } from './subscription/index';
 
 // Validate GraphQL documents.
 export {
@@ -324,9 +324,9 @@ export {
   ValuesOfCorrectTypeRule,
   VariablesAreInputTypesRule,
   VariablesInAllowedPositionRule,
-} from './validation';
+} from './validation/index';
 
-export type { ValidationRule } from './validation';
+export type { ValidationRule } from './validation/index';
 
 // Create, format, and print GraphQL errors.
 export {
@@ -335,9 +335,9 @@ export {
   locatedError,
   printError,
   formatError,
-} from './error';
+} from './error/index';
 
-export type { GraphQLFormattedError } from './error';
+export type { GraphQLFormattedError } from './error/index';
 
 // Utilities for operating on GraphQL type schema and parsed sources.
 export {
@@ -406,7 +406,7 @@ export {
   findDangerousChanges,
   // Report all deprecated usage within a GraphQL document.
   findDeprecatedUsages,
-} from './utilities';
+} from './utilities/index';
 
 export type {
   IntrospectionOptions,
@@ -434,4 +434,4 @@ export type {
   BuildSchemaOptions,
   BreakingChange,
   DangerousChange,
-} from './utilities';
+} from './utilities/index';