diff --git a/tsconfig.json b/tsconfig.json
index cbdb1382..47542a6d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,6 +3,7 @@
     "target": "es2019",
     "module": "es2020",
     "lib": ["es2020", "DOM", "DOM.Iterable"],
+    "types": ["mocha"],
     "declaration": true,
     "declarationMap": true,
     "sourceMap": true,