diff --git a/.gitignore b/.gitignore
index bdeb873..b743a60 100755
--- a/.gitignore
+++ b/.gitignore
@@ -38,3 +38,4 @@ stats.html
 examples
 src/node.mjs
 lightweight/index.js
+lightweight/index.umd.js
diff --git a/lightweight/index.d.ts b/lightweight/index.d.ts
index 95eab99..237c3c4 100644
--- a/lightweight/index.d.ts
+++ b/lightweight/index.d.ts
@@ -173,12 +173,18 @@ export type MqlError = {
 
 export type MqlOptions = MqlClientOptions & MicrolinkApiOptions;
 
+export const MicrolinkError: new (props: object) => MqlError;
+
+export const version: string;
+
 interface mql {
   (url: string, opts?: MqlOptions & { stream: string }, gotOpts?: object): Promise<Response>;
   (url: string, opts?: MqlOptions, gotOpts?: object): Promise<MqlResponse>;
   arrayBuffer: (url: string, opts?: MqlOptions, gotOpts?: object) => Promise<HTTPResponseRaw>;
   extend: (gotOpts?: object) => mql;
   stream: (input: RequestInfo, init?: RequestInit) => ReadableStream;
+  MicrolinkError,
+  version
 }
 
 declare const mql: mql;
diff --git a/rollup.config.js b/rollup.config.js
index 45719fc..32adce5 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -44,7 +44,7 @@ const builds = [
     plugins: [commonjs(), rewriteFlattie()]
   }),
   build({
-    compress: true,
+    compress: false,
     input: 'src/lightweight.js',
     output: { file: 'lightweight/index.js', format: 'es' },
     plugins: [
@@ -55,7 +55,7 @@ const builds = [
     ]
   }),
   build({
-    compress: true,
+    compress: false,
     input: 'src/lightweight.js',
     output: { name: 'mql', file: 'lightweight/index.umd.js', format: 'umd' },
     plugins: [
diff --git a/test/lightweight.test-d.ts b/test/lightweight.test-d.ts
index b23dc29..2fffd7d 100644
--- a/test/lightweight.test-d.ts
+++ b/test/lightweight.test-d.ts
@@ -1,9 +1,29 @@
-import mql from '../lightweight'
+import mql, { MicrolinkError } from '../lightweight'
 import type { MqlError } from '../lightweight'
 
+/** error  */
+
+;(async () => {
+  const error = new MicrolinkError({
+    status: 'fail',
+    data: { url: 'something goes wrong' },
+    more: 'https://microlink.io/docs/api/api-parameters/url',
+    code: 'EINVALURLCLIENT',
+    message: 'something goes wrong',
+    url: 'https://example.com'
+  })
+
+  console.log(error.status)
+  console.log(error.data)
+  console.log(error.more)
+  console.log(error.code)
+  console.log(error.url)
+  console.log(error.description)
+})()
+
 /** mql */
 
-;async () => {
+;(async () => {
   const result = await mql('https://example.com', {
     endpoint: 'https://pro.microlink.io',
     apiKey: '123',
@@ -16,7 +36,7 @@ import type { MqlError } from '../lightweight'
   console.log(result.statusCode)
   console.log(result.headers)
   console.log(result.response)
-}
+})()
 
 ;(async () => {
   const response = await mql('https://example.com', {
@@ -106,6 +126,9 @@ mql('https://example.com', {
   video: true
 })
 
+console.log(MicrolinkError)
+console.log(mql.version)
+
 /** response */
 
 const result = await mql('https://example.com', { meta: true })