diff --git a/@ember/library-tsconfig/tsconfig.json b/@ember/library-tsconfig/tsconfig.json
index 41fd63b..4af1546 100644
--- a/@ember/library-tsconfig/tsconfig.json
+++ b/@ember/library-tsconfig/tsconfig.json
@@ -16,10 +16,6 @@
     // to enforce using `import type` instead of `import` for Types.
     "verbatimModuleSyntax": true,
 
-    // Require sufficient annotation on exports so other tools can trivially generate declaration files.
-    // (also boosts type-checking performance)
-    "isolatedDeclarations": true,
-
     // only TypeScript-specific syntax that does not have runtime semantics are supported under this mode. 
     // In other words, it must be possible to easily erase any TypeScript-specific syntax from a file, 
     // leaving behind a valid JavaScript file.