1 files changed, 13 insertions, 0 deletions
diff --git a/src/ts/globals.d.ts b/src/ts/globals.d.ts
index 659638a1e..974b4b26d 100644
--- a/src/ts/globals.d.ts
+++ b/src/ts/globals.d.ts
@@ -1,3 +1,5 @@
+declare module 'chai-bignumber';
+
 declare type ETHPublicKey = string;
 declare type ETHAddressHex = string;
 declare type ETHAddressBuff = Buffer;
@@ -6,6 +8,17 @@ declare interface Schema {
     id: string;
 }
 
+// HACK: In order to merge the bignumber declaration added by chai-bignumber to the chai Assertion
+// interface we must use `namespace` as the Chai definitelyTyped definition does. Since we otherwise
+// disallow `namespace`, we disable tslint for the following.
+/* tslint:disable */
+declare namespace Chai {
+    interface Assertion {
+        bignumber: Assertion;
+    }
+}
+/* tslint:enable */
+
 declare module 'ethereumjs-util' {
     const toBuffer: (data: string) => Buffer;
     const hashPersonalMessage: (msg: Buffer) => Buffer;