diff --git a/.changeset/thirty-poems-chew.md b/.changeset/thirty-poems-chew.md
new file mode 100644
index 000000000000..1072fc92d3a8
--- /dev/null
+++ b/.changeset/thirty-poems-chew.md
@@ -0,0 +1,7 @@
+---
+"astro": minor
+---
+
+Enables type checking for JavaScript files when using the `strictest` TS config. This ensures consistency with Astro's other TS configs, and fixes type checking for integrations like Astro DB when using an `astro.config.mjs`.
+
+If you are currently using the `strictest` preset and would like to still disable `.js` files, set `allowJS: false` in your `tsconfig.json`.
diff --git a/packages/astro/tsconfigs/strictest.json b/packages/astro/tsconfigs/strictest.json
index 36f11635e8d2..f59dc4f6cd01 100644
--- a/packages/astro/tsconfigs/strictest.json
+++ b/packages/astro/tsconfigs/strictest.json
@@ -19,8 +19,6 @@
     // Report an error for unreachable code instead of just a warning.
     "allowUnreachableCode": false,
     // Report an error for unused labels instead of just a warning.
-    "allowUnusedLabels": false,
-    // Disallow JavaScript files from being imported
-    "allowJs": false
+    "allowUnusedLabels": false
   }
 }