diff --git a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.json b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.json
index 344909de212..e202245735f 100644
--- a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.json
+++ b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.json
@@ -1,6 +1,7 @@
 {
   "extends": "@tsconfig/node14/tsconfig.json",
   "compilerOptions": {
+    "lib": ["es2020", "dom"],
     "downlevelIteration": true,
     "importHelpers": true,
     "incremental": true,
@@ -9,5 +10,5 @@
     "rootDir": "src",
     "useUnknownInCatchVariables": false
   },
-  "exclude": ["test/"]
+  "exclude": ["node_modules/", "test/"]
 }
diff --git a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.types.json b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.types.json
index 4c3dfa7b3d2..33fc3b6c744 100644
--- a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.types.json
+++ b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.types.json
@@ -6,5 +6,5 @@
     "declarationDir": "dist-types",
     "emitDeclarationOnly": true
   },
-  "exclude": ["test/**/*", "dist-types/**/*"]
+  "exclude": ["node_modules/", "test/**/*", "dist-types/**/*"]
 }