Support type extensions with unreachable types policy rule (#7978)

.changeset/famous-paws-sell.md

@@ -0,0 +1,5 @@
+---
+'hive': patch
+---
+
+Add schema linting support for type extensions

packages/services/policy/__tests__/policy.spec.ts

@@ -210,6 +210,20 @@ describe('policy checks', () => {
     );
   });
 
+  it('should support type extensions', async () => {
+    const result = await schemaPolicyApiRouter
+      .createCaller({ req: { log: console } as any })
+      .checkPolicy({
+        source: `type Query extend type Query { foo: Foo } type Foo { id: ID! }`,
+        schema: `type Query extend type Query { foo: Foo } type Foo { id: ID! }`,
+        target: '1',
+        policy: {
+          'no-unreachable-types': [2],
+        },
+      });
+    expect(result).toHaveLength(0);
+  });
+
   /** To ensure existing policies dont break during upgrades */
   it.each(policies)('should support existing policies', async policy => {
     await expect(

patches/@graphql-eslint__eslint-plugin@3.20.1.patch

@@ -120,6 +120,40 @@ index d952cee1e10976459e7c5836b86ba6540c45fdb6..d314997bfd26477c7d823cad397eb5d6
    return {
      [ruleId]: {
        meta: {
+diff --git a/esm/rules/no-unreachable-types.js b/esm/rules/no-unreachable-types.js
+index 17e9394c80ebb2257ec6145421fafa227872d0ca..f39ad76d7948ccc4e35f6b7d4adb26dee9e4a71b 100644
+--- a/esm/rules/no-unreachable-types.js
++++ b/esm/rules/no-unreachable-types.js
+@@ -51,8 +51,15 @@ function getReachableTypes(schema) {
+       for (const { astNode } of [...objects, ...interfaces]) {
+         visit(astNode, visitor);
+       }
+-    } else if (type == null ? void 0 : type.astNode) {
+-      visit(type.astNode, visitor);
++    } else {
++      if (type == null ? void 0 : type.astNode) {
++        visit(type.astNode, visitor);
++      }
++      if (type == null ? void 0 : type.extensionASTNodes) {
++        for (const ext of type.extensionASTNodes) {
++          visit(ext, visitor);
++        }
++      }
+     }
+   };
+   const visitor = {
+@@ -74,6 +81,11 @@ function getReachableTypes(schema) {
+     if (type == null ? void 0 : type.astNode) {
+       visit(type.astNode, visitor);
+     }
++    if (type == null ? void 0 : type.extensionASTNodes) {
++      for (const ext of type.extensionASTNodes) {
++        visit(ext, visitor);
++      }
++    }
+   }
+   for (const node of schema.getDirectives()) {
+     if (node.locations.some((location) => RequestDirectiveLocations.has(location))) {
 diff --git a/esm/rules/relay-edge-types.js b/esm/rules/relay-edge-types.js
 index 7a7eb179786103d9d72a4a84fb4bf811d11a4286..6fb12a5f56b71f56c9a14018d0494e9c7584f935 100644
 --- a/esm/rules/relay-edge-types.js

pnpm-lock.yaml

@@ -56,7 +56,7 @@ patchedDependencies:
     hash: 2280c6d4f2e9268fc118d06dc95deea7e9b58200010db1b332004627d6793a9f
     path: patches/@graphql-codegen__schema-ast.patch
   '@graphql-eslint/eslint-plugin@3.20.1':
-    hash: 230c54b62a1b41bce5584acfdebdeadd5631d8cce18b137ecd712b9ebbe2244b
+    hash: 09fda5b278e2d5231c4881c9d877a8b38b813c049a8e6651f7dfb9df1da7f170
     path: patches/@graphql-eslint__eslint-plugin@3.20.1.patch
   '@oclif/core@3.26.6':
     hash: 7432c7b46bd5e3276faff9af4fc733575417c17a0ec31df3c7a229f766e3cffc
@@ -137,7 +137,7 @@ importers:
         version: 3.0.1(graphql@16.9.0)
       '@graphql-eslint/eslint-plugin':
         specifier: 3.20.1
-        version: 3.20.1(patch_hash=230c54b62a1b41bce5584acfdebdeadd5631d8cce18b137ecd712b9ebbe2244b)(@babel/core@7.28.5)(@types/node@24.12.2)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)
+        version: 3.20.1(patch_hash=09fda5b278e2d5231c4881c9d877a8b38b813c049a8e6651f7dfb9df1da7f170)(@babel/core@7.28.5)(@types/node@24.12.2)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)
       '@graphql-inspector/cli':
         specifier: 6.0.6
         version: 6.0.6(@types/node@24.12.2)(encoding@0.1.13)(graphql@16.9.0)
@@ -1450,7 +1450,7 @@ importers:
     devDependencies:
       '@graphql-eslint/eslint-plugin':
         specifier: 3.20.1
-        version: 3.20.1(patch_hash=230c54b62a1b41bce5584acfdebdeadd5631d8cce18b137ecd712b9ebbe2244b)(@babel/core@7.28.5)(@types/node@25.5.0)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)
+        version: 3.20.1(patch_hash=09fda5b278e2d5231c4881c9d877a8b38b813c049a8e6651f7dfb9df1da7f170)(@babel/core@7.28.5)(@types/node@25.5.0)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)
       '@hive/service-common':
         specifier: workspace:*
         version: link:../service-common
@@ -22374,7 +22374,7 @@ snapshots:
       parse-filepath: 1.0.2
       tslib: 2.6.3
 
-  '@graphql-eslint/eslint-plugin@3.20.1(patch_hash=230c54b62a1b41bce5584acfdebdeadd5631d8cce18b137ecd712b9ebbe2244b)(@babel/core@7.28.5)(@types/node@24.12.2)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)':
+  '@graphql-eslint/eslint-plugin@3.20.1(patch_hash=09fda5b278e2d5231c4881c9d877a8b38b813c049a8e6651f7dfb9df1da7f170)(@babel/core@7.28.5)(@types/node@24.12.2)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)':
     dependencies:
       '@babel/code-frame': 7.29.0
       '@graphql-tools/code-file-loader': 7.3.23(@babel/core@7.28.5)(graphql@16.9.0)
@@ -22397,7 +22397,7 @@ snapshots:
       - supports-color
       - utf-8-validate
 
-  '@graphql-eslint/eslint-plugin@3.20.1(patch_hash=230c54b62a1b41bce5584acfdebdeadd5631d8cce18b137ecd712b9ebbe2244b)(@babel/core@7.28.5)(@types/node@25.5.0)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)':
+  '@graphql-eslint/eslint-plugin@3.20.1(patch_hash=09fda5b278e2d5231c4881c9d877a8b38b813c049a8e6651f7dfb9df1da7f170)(@babel/core@7.28.5)(@types/node@25.5.0)(cosmiconfig-toml-loader@1.0.0)(encoding@0.1.13)(graphql@16.9.0)':
     dependencies:
       '@babel/code-frame': 7.29.0
       '@graphql-tools/code-file-loader': 7.3.23(@babel/core@7.28.5)(graphql@16.9.0)