From 19aaade9c62510012cfd50ae487ebd1705a28678 Mon Sep 17 00:00:00 2001
From: Richard Moore <github@ricmoo.com>
Date: Wed, 20 Nov 2019 18:26:59 +0900
Subject: [PATCH] Added support for sighash-style tuple parsing.

---
 packages/abi/src.ts/fragments.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/abi/src.ts/fragments.ts b/packages/abi/src.ts/fragments.ts
index 1c4476d655..f80e9dd70a 100644
--- a/packages/abi/src.ts/fragments.ts
+++ b/packages/abi/src.ts/fragments.ts
@@ -87,7 +87,11 @@ function parseParamType(param: string, allowIndexed: boolean): ParseNode {
         let c = param[i];
         switch (c) {
             case "(":
-                if (!node.state.allowParams) { throwError(i); }
+                if (node.state.allowType && node.type === "") {
+                    node.type = "tuple";
+                } else if (!node.state.allowParams) {
+                    throwError(i);
+                }
                 node.state.allowType = false;
                 node.type = verifyType(node.type);
                 node.components = [ newNode(node) ];