diff --git a/package.json b/package.json
index 8b32316..cf00235 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
   ],
   "license": "MIT",
   "scripts": {
-    "build": "tsc -d && tsc -p tsconfig.esm.json",
+    "build": "tsc && tsc -p tsconfig.esm.json",
     "lint": "prettier --check 'index.ts' 'test/*.test.ts'",
     "format": "prettier --write 'index.ts' 'test/*.test.ts'",
     "test": "cd test && tsc && node hdkey.test.js"
diff --git a/tsconfig.esm.json b/tsconfig.esm.json
index 83bf843..7516d5b 100644
--- a/tsconfig.esm.json
+++ b/tsconfig.esm.json
@@ -1,25 +1,21 @@
 {
   "compilerOptions": {
-    "strict": true,
     "target": "es2020",
     "lib": ["es2020"],
     "module": "es6",
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "outDir": "lib/esm",
     "baseUrl": ".",
     "sourceMap": true,
+    "strict": true,
     "allowSyntheticDefaultImports": false,
     "allowUnreachableCode": false,
     "esModuleInterop": false,
     "noFallthroughCasesInSwitch": true,
-    "noImplicitAny": true,
     "noImplicitReturns": true,
+    "noUncheckedIndexedAccess": true,
+    "noUnusedLocals": true,
     "noUnusedParameters": true,
-    "strictBindCallApply": true,
-    "strictFunctionTypes": true,
-    "strictNullChecks": true,
-    "strictPropertyInitialization": true,
-    "useUnknownInCatchVariables": true,
   },
   "include": ["index.ts"],
   "exclude": ["node_modules", "lib"]
diff --git a/tsconfig.json b/tsconfig.json
index 23ba540..f5ee1c6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,27 +1,23 @@
 {
   "compilerOptions": {
-    "strict": true,
     "target": "es2020",
     "lib": ["es2020"],
     "module": "commonjs",
-    "moduleResolution": "node",
     "outDir": "lib",
     "baseUrl": ".",
-    "declaration": true,
     "sourceMap": true,
     "resolveJsonModule": true,
+    "declaration": true,
+    "declarationMap": true,
+    "strict": true,
     "allowSyntheticDefaultImports": false,
     "allowUnreachableCode": false,
     "esModuleInterop": false,
     "noFallthroughCasesInSwitch": true,
-    "noImplicitAny": true,
     "noImplicitReturns": true,
+    "noUncheckedIndexedAccess": true,
+    "noUnusedLocals": true,
     "noUnusedParameters": true,
-    "strictBindCallApply": true,
-    "strictFunctionTypes": true,
-    "strictNullChecks": true,
-    "strictPropertyInitialization": true,
-    "useUnknownInCatchVariables": true,
   },
   "include": ["index.ts"],
   "exclude": ["node_modules", "lib"]