fix no-unreachable-types ignore types from directive arguments with request locations (#1469)

Author: dimaMachina

.changeset/honest-yaks-trade.md

@@ -0,0 +1,5 @@
+---
+'@graphql-eslint/eslint-plugin': patch
+---
+
+fix `no-unreachable-types` ignore types from directive arguments with request locations

packages/plugin/src/rules/no-unreachable-types.ts

@@ -98,6 +98,12 @@ function getReachableTypes(schema: GraphQLSchema): ReachableTypes {
   for (const node of schema.getDirectives()) {
     if (node.locations.some(location => RequestDirectiveLocations.has(location))) {
       reachableTypes.add(node.name);
+      for (const arg of node.args) {
+        const argTypeName = 'name' in arg.type && arg.type.name;
+        if (argTypeName) {
+          reachableTypes.add(argTypeName);
+        }
+      }
     }
   }
 

packages/plugin/tests/no-unreachable-types.spec.ts

@@ -148,6 +148,17 @@ ruleTester.runGraphQLTests('no-unreachable-types', rule, {
         type Query
       `),
     },
+    {
+      name: 'should ignore types from directive arguments with request locations',
+      ...useSchema(/* GraphQL */ `
+        enum Enum {
+          A
+          B
+        }
+        directive @q(arg: Enum = A) on QUERY
+        type Query
+      `),
+    },
   ],
   invalid: [
     {