diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 917ac9e..b597ec6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,3 +23,4 @@ jobs:
     - run: npm i
     - run: npm test
     - run: npm run build
+    - run: .github/workflows/test-build.sh
diff --git a/.github/workflows/test-build.js b/.github/workflows/test-build.js
new file mode 100644
index 0000000..4dd0e53
--- /dev/null
+++ b/.github/workflows/test-build.js
@@ -0,0 +1,21 @@
+const assert = require('assert');
+
+const chardet = require(process.cwd());
+
+assert(typeof chardet.analyse, 'function');
+assert(typeof chardet.detect, 'function');
+assert(typeof chardet.detectFile, 'function');
+assert(typeof chardet.detectFileSync, 'function');
+
+assert.deepStrictEqual(chardet.analyse(Buffer.from('This is a test')), [
+  { confidence: 98, name: 'ISO-8859-1', lang: 'en' },
+  { confidence: 98, name: 'ISO-8859-2', lang: 'hu' },
+  { confidence: 10, name: 'UTF-8', lang: undefined },
+  { confidence: 10, name: 'Shift_JIS', lang: 'ja' },
+  { confidence: 10, name: 'Big5', lang: 'zh' },
+  { confidence: 10, name: 'EUC-JP', lang: 'ja' },
+  { confidence: 10, name: 'EUC-KR', lang: 'ko' },
+  { confidence: 10, name: 'GB18030', lang: 'zh' },
+]);
+
+console.log(' > test-build.js OK');
diff --git a/.github/workflows/test-build.sh b/.github/workflows/test-build.sh
new file mode 100755
index 0000000..9bde9a1
--- /dev/null
+++ b/.github/workflows/test-build.sh
@@ -0,0 +1,6 @@
+#!/bin/sh -ex
+
+export PATH=$PATH:$(npm bin)
+
+node ./.github/workflows/test-build.js
+ts-node ./.github/workflows/test-build.ts
\ No newline at end of file
diff --git a/.github/workflows/test-build.ts b/.github/workflows/test-build.ts
new file mode 100644
index 0000000..79f925c
--- /dev/null
+++ b/.github/workflows/test-build.ts
@@ -0,0 +1,28 @@
+import assert from 'assert';
+
+const main = async () => {
+  const chardet = await import(process.cwd());
+
+  assert(typeof chardet.analyse, 'function');
+  assert(typeof chardet.detect, 'function');
+  assert(typeof chardet.detectFile, 'function');
+  assert(typeof chardet.detectFileSync, 'function');
+
+  assert.deepStrictEqual(chardet.analyse(Buffer.from('This is a test')), [
+    { confidence: 98, name: 'ISO-8859-1', lang: 'en' },
+    { confidence: 98, name: 'ISO-8859-2', lang: 'hu' },
+    { confidence: 10, name: 'UTF-8', lang: undefined },
+    { confidence: 10, name: 'Shift_JIS', lang: 'ja' },
+    { confidence: 10, name: 'Big5', lang: 'zh' },
+    { confidence: 10, name: 'EUC-JP', lang: 'ja' },
+    { confidence: 10, name: 'EUC-KR', lang: 'ko' },
+    { confidence: 10, name: 'GB18030', lang: 'zh' },
+  ]);
+};
+
+main()
+  .then(() => console.log(' > test-build.ts OK'))
+  .catch((err) => {
+    console.error(err);
+    process.exit(1);
+  });
diff --git a/README.md b/README.md
index bc32617..7da2139 100644
--- a/README.md
+++ b/README.md
@@ -21,19 +21,19 @@ npm i chardet
 To return the encoding with the highest confidence:
 
 ```javascript
-const chardet = require('chardet');
+import chardet from 'chardet';
 
-chardet.detect(Buffer.from('hello there!'));
+const encoding = chardet.detect(Buffer.from('hello there!'));
 // or
-chardet.detectFile('/path/to/file').then(encoding => console.log(encoding));
+const encoding = await chardet.detectFile('/path/to/file');
 // or
-chardet.detectFileSync('/path/to/file');
+const encoding = chardet.detectFileSync('/path/to/file');
 ```
 
 To return the full list of possible encodings use `analyse` method.
 
 ```javascript
-const chardet = require('chardet');
+import chardet from 'chardet';
 chardet.analyse(Buffer.from('hello there!'));
 ```
 
@@ -48,7 +48,7 @@ Returned value is an array of objects sorted by confidence value in decending or
 
 ## Working with large data sets
 
-Sometimes, when data set is huge and you want to optimize performace (in tradeoff of less accuracy),
+Sometimes, when data set is huge and you want to optimize performace (with a tradeoff of less accuracy),
 you can sample only first N bytes of the buffer:
 
 ```javascript
diff --git a/package.json b/package.json
index 3e97308..32e46bd 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,7 @@
     "prettier": "^2.1.2",
     "semantic-release": "^17.1.2",
     "ts-jest": "^26.4.0",
+    "ts-node": "^10.9.1",
     "typescript": "^4.8.4"
   },
   "keywords": [