diff --git a/config/typescript/tsconfig.base.json b/config/typescript/tsconfig.base.json
index a34afd7e1c..02c0d4525e 100644
--- a/config/typescript/tsconfig.base.json
+++ b/config/typescript/tsconfig.base.json
@@ -2,6 +2,7 @@
   "extends": "@shopify/typescript-configs/library.json",
   "compilerOptions": {
     "composite": true,
+    "emitDeclarationOnly": true,
     // Strict mode enables these strict* and noImplicit* options.
     // Disable them temporarily while we fix up problematic behaviour from
     // the time before we wanted strict mode
diff --git a/packages/graphql-testing/tsconfig.json b/packages/graphql-testing/tsconfig.json
index 389110cdcb..d0e900d26e 100644
--- a/packages/graphql-testing/tsconfig.json
+++ b/packages/graphql-testing/tsconfig.json
@@ -3,8 +3,7 @@
   "compilerOptions": {
     "outDir": "build/ts",
     "rootDir": "src",
-    "baseUrl": "src",
-    "isolatedModules": false
+    "baseUrl": "src"
   },
   "include": [
     "../../config/typescript/*.d.ts",