Add TypeScript 6.0 support and pin CI versions

- Remove deprecated `downlevelIteration`, add explicit `types: ["node"]`
  for TS 6's stricter type resolution
- Fix catch clauses and implicit any for TS 6 compatibility
- Add TS 6.0.2 to CI matrix and pin all TS versions to exact patches
- Update changelog

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: captbaritone

.github/workflows/ci.yaml

@@ -57,9 +57,10 @@ jobs:
       matrix:
         node-version: *node-versions
         typescript-version:
-          - "5.5"
-          - "5.7"
-          - "~5.9"
+          - "5.5.4"
+          - "5.7.3"
+          - "5.9.3"
+          - "6.0.2"
     steps:
       - uses: actions/checkout@v3
       - uses: pnpm/action-setup@v2

package.json

@@ -28,7 +28,6 @@
     "typescript": ">=5.5"
   },
   "devDependencies": {
-    "typescript": "5.9.2",
     "@eslint/eslintrc": "^3.3.1",
     "@eslint/js": "^9.36.0",
     "@types/node": "^24.5.2",
@@ -42,7 +41,8 @@
     "path-browserify": "^1.0.1",
     "prettier": "^3.6.2",
     "process": "^0.11.10",
-    "tsx": "^4.19.0"
+    "tsx": "^4.19.0",
+    "typescript": "5.9.2"
   },
   "prettier": {
     "trailingComma": "all"

src/Extractor.ts

@@ -3046,7 +3046,7 @@ function graphQLNameValidationMessage(name: string): string | null {
   try {
     assertName(name);
     return null;
-  } catch (e) {
+  } catch (e: any) {
     return e.message;
   }
 }

src/tests/TestRunner.ts

@@ -189,7 +189,7 @@ export default class TestRunner {
   async transform(code: string, filename: string): Promise<TransformerResult> {
     try {
       return await this._transformer(code, filename);
-    } catch (e) {
+    } catch (e: any) {
       console.error(e);
       return { kind: "ERROR", err: e.message };
     }

src/tests/test.ts

@@ -126,7 +126,7 @@ const testDirs: TestDir[] = [
           );
         }
         parsed = parsedResult.value;
-      } catch (e) {
+      } catch (e: any) {
         return err(e.message);
       }
       console.warn = consoleWarn;
@@ -191,7 +191,7 @@ const testDirs: TestDir[] = [
           );
         }
         parsedOptions = parsedOptionsResult.value;
-      } catch (e) {
+      } catch (e: any) {
         return err(e.message);
       }
 

src/utils/visitor.ts

@@ -59,7 +59,7 @@ export function visitDefinitions(doc: DocumentNode, visitors: Visitor) {
   });
 }
 
-const emptyArray = [];
+const emptyArray: never[] = [];
 
 /**
  * Simplified, more performant, version of graphql-js's visit function that only

tsconfig.json

@@ -4,10 +4,10 @@
   },
   "compilerOptions": {
     "skipLibCheck": true,
+    "types": ["node"],
     "lib": ["es2020"],
     "experimentalDecorators": true,
     "outDir": "dist",
-    "downlevelIteration": true,
     "strictNullChecks": true,
     "declaration": true,
     "resolveJsonModule": true,

website/docs/07-changelog/index.md

@@ -6,6 +6,10 @@ Changes in this section are not yet released. If you need access to these change
 
 - **Features**
   - Added support for deriving `@gqlEnum` from const arrays (`(typeof X)[number]`) and const objects (`(typeof X)[keyof typeof X]`). This allows defining enums with runtime-accessible values without using TypeScript's `enum` syntax. The const declaration must immediately precede the type alias. See [enum docs](../04-docblock-tags/07-enums.mdx#runtime-accessible-enums) for details.
+- **Improvements**
+  - `typescript` is now a peer dependency (`>=5.5`) instead of a direct dependency, allowing you to use your own TypeScript version. ([PR](https://github.com/captbaritone/grats/pull/228))
+  - Added support for TypeScript 6.0. ([PR](https://github.com/captbaritone/grats/pull/228))
+  - CI now tests against TypeScript 5.5, 5.7, 5.9, and 6.0.
 
 ## 0.0.36