fix TypeError: Cannot read properties of undefined (reading 'kind') for require-nullable-result-in-root rule (#1665)

Author: dimaMachina

.changeset/lovely-otters-watch.md

@@ -0,0 +1,6 @@
+---
+'@graphql-eslint/eslint-plugin': patch
+---
+
+fix `TypeError: Cannot read properties of undefined (reading 'kind')` for
+`require-nullable-result-in-root` rule

package.json

@@ -31,7 +31,7 @@
     "chalk": "4.1.2",
     "dedent": "0.7.0",
     "enquirer": "2.3.6",
-    "eslint": "8.38.0",
+    "eslint": "8.41.0",
     "eslint-plugin-eslint-plugin": "5.0.7",
     "eslint-plugin-tailwindcss": "3.12.0",
     "husky": "8.0.3",
@@ -49,7 +49,7 @@
   },
   "pnpm": {
     "patchedDependencies": {
-      "eslint@8.38.0": "patches/[email protected]",
+      "eslint@8.41.0": "patches/[email protected]",
       "[email protected]": "patches/[email protected]",
       "[email protected]": "patches/[email protected]",
       "@vitest/[email protected]": "patches/@[email protected]"

packages/plugin/src/rules/require-nullable-result-in-root.ts

@@ -63,13 +63,13 @@ export const rule: GraphQLESLintRule = {
             continue;
           const name = field.gqlType.gqlType.name.value;
           const type = schema.getType(name);
-          const resultType = type ? getNodeName(type.astNode as any) : '';
+          const resultType = type?.astNode ? getNodeName(type.astNode as any) : type?.name;
 
           context.report({
             node: field.gqlType,
             messageId: RULE_ID,
             data: {
-              resultType,
+              resultType: resultType || '',
               rootType: getNodeName(node),
             },
             suggest: [

packages/plugin/tests/__snapshots__/require-nullable-result-in-root.spec.md

@@ -27,6 +27,35 @@ exports[`Invalid #1 1`] = `
     6 |         }
 `;
 
+exports[`should work with default scalars 1`] = `
+#### ⌨️ Code
+
+      1 |         type MySubscription
+      2 |         extend type MySubscription {
+      3 |           foo: Boolean!
+      4 |         }
+      5 |         schema {
+      6 |           subscription: MySubscription
+      7 |         }
+
+#### ❌ Error
+
+      2 |         extend type MySubscription {
+    > 3 |           foo: Boolean!
+        |                ^^^^^^^ Unexpected non-null result Boolean in type "MySubscription"
+      4 |         }
+
+#### 💡 Suggestion: Make Boolean nullable
+
+    1 |         type MySubscription
+    2 |         extend type MySubscription {
+    3 |           foo: Boolean
+    4 |         }
+    5 |         schema {
+    6 |           subscription: MySubscription
+    7 |         }
+`;
+
 exports[`should work with extend query 1`] = `
 #### ⌨️ Code
 

packages/plugin/tests/require-nullable-result-in-root.spec.ts

@@ -53,5 +53,18 @@ ruleTester.runGraphQLTests('require-nullable-result-in-root', rule, {
       `),
       errors: 1,
     },
+    {
+      name: 'should work with default scalars',
+      ...useSchema(/* GraphQL */ `
+        type MySubscription
+        extend type MySubscription {
+          foo: Boolean!
+        }
+        schema {
+          subscription: MySubscription
+        }
+      `),
+      errors: 1,
+    },
   ],
 });