1 files changed, 4 insertions, 0 deletions
diff --git a/src/globals.d.ts b/src/globals.d.ts
index d86f54dfc..901377bd2 100644
--- a/src/globals.d.ts
+++ b/src/globals.d.ts
@@ -18,6 +18,10 @@ declare namespace Chai {
         bignumber: Assertion;
         // HACK: In order to comply with chai-as-promised we make eventually a `PromisedAssertion` not an `Assertion`
         eventually: PromisedAssertion;
+        true: () => void;
+        false: () => void;
+        rejected: () => void;
+        undefined: () => void;
     }
 }
 /* tslint:enable */