diff --git a/nodejs/index.d.ts b/nodejs/index.d.ts
new file mode 100644
index 0000000..5597888
--- /dev/null
+++ b/nodejs/index.d.ts
@@ -0,0 +1,35 @@
+export type Cfg = { __doNotUseCfgDirectly: string & { __itIsANapiExternalValue: never } };
+
+/**
+ * Creates configuration that can be passed to minification functions to change the minification approach.
+ * The value returned is an [external](https://nodejs.org/api/n-api.html#n_api_napi_create_external) value with typeof `object` and prototype `null`; it does not have any properties, and should only be used as arguments to minify functions.
+ *
+ * @param options - Configurable minifier settings to use when this configuration is passed to a minify function
+ * @returns An opaque value that can be passed to minify functions
+ */
+export function createConfiguration (options: {
+  /**
+   * If enabled, content in `<script>` tags with a JS or no [MIME type](https://mimesniff.spec.whatwg.org/#javascript-mime-type) will be minified using [esbuild-rs](https://github.com/wilsonzlin/esbuild-rs).
+   */
+  minifyJs: false;
+}): Cfg;
+
+/**
+ * Minifies a string containing HTML code.
+ * Throws an {@link Error} if the source code cannot be minified, with a `position` property representing the position of the character in the source code that caused the error.
+ *
+ * @param src - Source HTML code
+ * @param cfg - Configuration created by {@link createConfiguration}
+ * @returns Minified HTML code
+ */
+export function minify (src: string, cfg: Cfg): string;
+
+/**
+ * Minifies a {@link Buffer} containing UTF-8 HTML code in place.
+ * Throws an {@link Error} if the source code cannot be minified, with a `position` property representing the position of the character in the source code that caused the error.
+ *
+ * @param code - Source Buffer code
+ * @param cfg - Configuration created by {@link createConfiguration}
+ * @returns Subslice of source Buffer (not a copy) representing the minified output HTML
+ */
+export function minifyInPlace (code: Buffer, cfg: Cfg): Buffer;
diff --git a/nodejs/package.json b/nodejs/package.json
index b01842b..3ebce84 100644
--- a/nodejs/package.json
+++ b/nodejs/package.json
@@ -3,6 +3,7 @@
   "version": "0.3.7",
   "description": "Fast and smart HTML + JS minifier",
   "main": "index.node",
+  "types": "index.d.ts",
   "files": [
     "postinstall.js"
   ],
@@ -29,6 +30,7 @@
   },
   "homepage": "https://github.com/wilsonzlin/minify-html#readme",
   "devDependencies": {
+    "@types/node": "^14.6.0",
     "node-gyp": "^7.0.0",
     "shx": "^0.3.2"
   },