diff --git a/package.json b/package.json
index 2eefaf0..9975246 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "dev:network": "astro dev --host",
     "build": "astro check && astro build",
     "typecheck": "npm run typecheck:app && npm run typecheck:playwright",
-    "typecheck:app": "tsc -p tsconfig.json --noEmit",
+    "typecheck:app": "astro sync && tsc -p tsconfig.json --noEmit",
     "typecheck:playwright": "tsc -p tsconfig.playwright.json --noEmit",
     "preview": "astro preview",
     "preview:network": "astro preview --host",
diff --git a/tsconfig.playwright.json b/tsconfig.playwright.json
index b108b2c..62e8594 100644
--- a/tsconfig.playwright.json
+++ b/tsconfig.playwright.json
@@ -1,6 +1,8 @@
 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
+    // `types` replaces (not merges) the parent array; `astro/client` is
+    // intentionally dropped because Playwright tests don't need it.
     "types": [
       "node",
       "@playwright/test"