diff --git a/eslint.config.js b/eslint.config.js
index d4e4bdb5..2159edfc 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -20,4 +20,11 @@ module.exports = antfu(
       'unicorn/prefer-node-protocol': 'off',
     },
   },
+  {
+    files: ['**/src/**/*.ts'],
+    rules: {
+      'node/no-unsupported-features/node-builtins': 'error',
+      'node/no-unsupported-features/es-builtins': 'error',
+    },
+  },
 )
diff --git a/package.json b/package.json
index 828dcb6e..37b1c363 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,9 @@
   "files": [
     "dist"
   ],
+  "engines": {
+    "node": ">=14.0.0"
+  },
   "scripts": {
     "build": "tsup",
     "dev": "tsup --watch src",
diff --git a/src/esbuild/index.ts b/src/esbuild/index.ts
index d7b415e5..e55b5bf1 100644
--- a/src/esbuild/index.ts
+++ b/src/esbuild/index.ts
@@ -68,7 +68,7 @@ export function getEsbuildPlugin<UserOptions = Record<string, never>>(
             loader.onLoadCb = callback
           },
           onTransform(_options, callback) {
-            loader.options = loader.options || _options
+            loader.options ||= _options
             loader.onTransformCb = callback
           },
         } as EsbuildPluginBuild)
@@ -100,11 +100,11 @@ export function getEsbuildPlugin<UserOptions = Record<string, never>>(
               continue
 
             if (onTransformCb) {
-              result = result || {}
+              result ||= {}
               // caution: 'utf8' assumes the input file is not in binary.
               // if you want your plugin handle binary files, make sure to
               // `plugin.load()` them first.
-              result.contents = result.contents || await fs.promises.readFile(args.path, 'utf8')
+              result.contents ||= await fs.promises.readFile(args.path, 'utf8')
 
               const _result = await onTransformCb({
                 ...result,
diff --git a/tsup.config.ts b/tsup.config.ts
index 0b6af70a..240a654e 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -5,7 +5,7 @@ export const tsup: Options = {
   sourcemap: false,
   clean: true,
   format: ['cjs', 'esm'],
-  target: 'node16.14',
+  target: 'node14',
   dts: true,
   shims: true,
   entry: [