Add eth_signTypedData support to our wallet subproviders

packages/types/CHANGELOG.json

@@ -1,4 +1,13 @@
 [
+    {
+        "version": "1.2.0",
+        "changes": [
+            {
+                "note": "Added `EIP712Parameter` `EIP712Types` `EIP712TypedData` for EIP712 signing",
+                "pr": 1102
+            }
+        ]
+    },
     {
         "timestamp": 1538693146,
         "version": "1.1.4",

packages/types/src/index.ts

@@ -589,3 +589,18 @@ export interface Metadata {
     externalTypeToLink: ExternalTypeToLink;
     externalExportToLink: ExternalExportToLink;
 }
+
+export interface EIP712Parameter {
+    name: string;
+    type: string;
+}
+
+export interface EIP712Types {
+    [key: string]: EIP712Parameter[];
+}
+export interface EIP712TypedData {
+    types: EIP712Types;
+    domain: any;
+    message: any;
+    primaryType: string;
+}