diff --git a/chai.d.ts b/chai.d.ts
new file mode 100644
index 0000000..02d910b
--- /dev/null
+++ b/chai.d.ts
@@ -0,0 +1,3 @@
+import chai from "chai";
+
+export = chai;
diff --git a/package.json b/package.json
index a2439a8..ea1f60b 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "main": "chai.js",
   "module": "esm/chai.js",
   "type": "module",
+  "types": "chai.d.ts",
   "scripts": {
     "test": "yarn build && concurrently -n w: 'yarn:test:*'",
     "test:browser": "karma start karma.conf.cjs --single-run",
@@ -23,7 +24,8 @@
   },
   "files": [
     "esm",
-    "system"
+    "system",
+    "chai.d.ts"
   ],
   "repository": {
     "type": "git",
@@ -43,5 +45,8 @@
   },
   "publishConfig": {
     "access": "public"
+  },
+  "dependencies": {
+    "@types/chai": "^4.2.12"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index c63778c..bd918c7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -708,6 +708,11 @@
     "@types/node" "*"
     "@types/responselike" "*"
 
+"@types/chai@^4.2.12":
+  version "4.2.12"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.12.tgz#6160ae454cd89dae05adc3bb97997f488b608201"
+  integrity sha512-aN5IAC8QNtSUdQzxu7lGBgYAOuU1tmRU4c9dIq5OKGf/SBVjXo+ffM2wEjudAWbgpOhy60nLoAGH1xm8fpCKFQ==
+
 "@types/color-name@^1.1.1":
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"