1 files changed, 36 insertions, 0 deletions
diff --git a/packages/migrations/src/types.ts b/packages/migrations/src/types.ts
index 65f685797..7347f27fe 100644
--- a/packages/migrations/src/types.ts
+++ b/packages/migrations/src/types.ts
@@ -1,3 +1,4 @@
+import { ECSignature } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 
 export interface ERC20Token {
@@ -27,3 +28,38 @@ export enum ContractName {
     EtherDelta = 'EtherDelta',
     Arbitrage = 'Arbitrage',
 }
+
+export interface LedgerCommunicationClient {
+    close: () => Promise<void>;
+}
+
+export interface LedgerGetAddressResult {
+    address: string;
+    publicKey: string;
+    chainCode: string;
+}
+
+export interface ECSignatureString {
+    v: string;
+    r: string;
+    s: string;
+}
+
+export interface LedgerGetAddressResult {
+    address: string;
+    publicKey: string;
+    chainCode: string;
+}
+
+export interface LedgerEthereumClient {
+    // shouldGetChainCode is defined as `true` instead of `boolean` because other types rely on the assumption
+    // that we get back the chain code and we don't have dependent types to express it properly
+    getAddress: (
+        derivationPath: string,
+        askForDeviceConfirmation: boolean,
+        shouldGetChainCode: true,
+    ) => Promise<LedgerGetAddressResult>;
+    signTransaction: (derivationPath: string, rawTxHex: string) => Promise<ECSignatureString>;
+    signPersonalMessage: (derivationPath: string, messageHex: string) => Promise<ECSignature>;
+    transport: LedgerCommunicationClient;
+}