fix: build config stays plain JS, not TS

eslint.config.ts

@@ -12,6 +12,8 @@ export default exadevConfig(
       ".turbo",
       "vendor",
       "test/fixtures/generated",
+      // Plain JS (not TS), specifically so it never needs Node's native type-stripping to load -- see tsdown.config.js's own comment for why. Nothing here needs type-aware linting.
+      "tsdown.config.js",
     ],
   },
   {

tsconfig.node.json

@@ -3,6 +3,6 @@
   "compilerOptions": {
     "allowImportingTsExtensions": true
   },
-  "include": ["src/cli.ts", "tsdown.config.ts", "eslint.config.ts", "test/**/*.ts"],
+  "include": ["src/cli.ts", "eslint.config.ts", "test/**/*.ts"],
   "exclude": ["test/fixtures/generated/protocol.ts"]
 }

turbo.json

@@ -9,7 +9,7 @@
     },
     "_build": {
       "dependsOn": ["_vendor:build"],
-      "inputs": ["src/emitter.ts", "src/runtime.ts", "src/parse.ts", "tsdown.config.ts", "tsconfig.json"],
+      "inputs": ["src/emitter.ts", "src/runtime.ts", "src/parse.ts", "tsdown.config.js", "tsconfig.json"],
       "outputs": ["dist/**"]
     },
     "_generate": {