Move recommended rules to their own list

src/index.d.ts

@@ -317,6 +317,7 @@ export {
   ValidationContext,
   // All validation rules in the GraphQL Specification.
   specifiedRules,
+  recommendedRules,
   // Individual validation rules.
   ExecutableDefinitionsRule,
   FieldsOnCorrectTypeRule,

src/index.js

@@ -303,6 +303,7 @@ export {
   ValidationContext,
   // All validation rules in the GraphQL Specification.
   specifiedRules,
+  recommendedRules,
   // Individual validation rules.
   ExecutableDefinitionsRule,
   FieldsOnCorrectTypeRule,

src/validation/index.d.ts

@@ -2,7 +2,7 @@ export { validate } from './validate';
 
 export { ValidationContext, ValidationRule } from './ValidationContext';
 
-export { specifiedRules } from './specifiedRules';
+export { specifiedRules, recommendedRules } from './specifiedRules';
 
 // Spec Section: "Executable Definitions"
 export { ExecutableDefinitionsRule } from './rules/ExecutableDefinitionsRule';

src/validation/index.js

@@ -4,7 +4,7 @@ export { ValidationContext } from './ValidationContext';
 export type { ValidationRule } from './ValidationContext';
 
 // All validation rules in the GraphQL Specification.
-export { specifiedRules } from './specifiedRules';
+export { specifiedRules, recommendedRules } from './specifiedRules';
 
 // Spec Section: "Executable Definitions"
 export { ExecutableDefinitionsRule } from './rules/ExecutableDefinitionsRule';

src/validation/specifiedRules.d.ts

@@ -1,5 +1,11 @@
 import { ValidationRule, SDLValidationRule } from './ValidationContext';
 
+/**
+ * Technically these aren't part of the spec but they are strongly encouraged
+ * validation rules.
+ */
+export const recommendedRules: ReadonlyArray<ValidationRule>;
+
 /**
  * This set includes all validation rules defined by the GraphQL spec.
  *

src/validation/specifiedRules.js

@@ -94,6 +94,12 @@ import { UniqueFieldDefinitionNamesRule } from './rules/UniqueFieldDefinitionNam
 import { UniqueDirectiveNamesRule } from './rules/UniqueDirectiveNamesRule';
 import { PossibleTypeExtensionsRule } from './rules/PossibleTypeExtensionsRule';
 
+/**
+ * Technically these aren't part of the spec but they are strongly encouraged
+ * validation rules.
+ */
+export const recommendedRules = Object.freeze([MaxIntrospectionDepthRule]);
+
 /**
  * This set includes all validation rules defined by the GraphQL spec.
  *
@@ -127,8 +133,7 @@ export const specifiedRules = Object.freeze([
   VariablesInAllowedPositionRule,
   OverlappingFieldsCanBeMergedRule,
   UniqueInputFieldNamesRule,
-  // Technically this isn't part of the spec but it's a strongly encouraged validation rule.
-  MaxIntrospectionDepthRule,
+  ...recommendedRules,
 ]);
 
 /**