1 files changed, 29 insertions, 1 deletions
diff --git a/packages/order-watcher/src/types.ts b/packages/order-watcher/src/types.ts
index 8078dd971..7f6219732 100644
--- a/packages/order-watcher/src/types.ts
+++ b/packages/order-watcher/src/types.ts
@@ -1,4 +1,4 @@
-import { OrderState } from '@0x/types';
+import { OrderState, SignedOrder } from '@0x/types';
 import { LogEntryEvent } from 'ethereum-types';
 
 export enum OrderWatcherError {
@@ -31,3 +31,31 @@ export enum InternalOrderWatcherError {
     ZrxNotInTokenRegistry = 'ZRX_NOT_IN_TOKEN_REGISTRY',
     WethNotInTokenRegistry = 'WETH_NOT_IN_TOKEN_REGISTRY',
 }
+
+export enum OrderWatcherAction {
+    // Actions initiated by the user.
+    GetStats = 'GET_STATS',
+    AddOrder = 'ADD_ORDER',
+    RemoveOrder = 'REMOVE_ORDER',
+    // These are spontaneous; they are primarily orderstate changes.
+    Update = 'UPDATE',
+    // `subscribe` and `unsubscribe` are methods of OrderWatcher, but we don't
+    // need to expose them to the WebSocket server user because the user implicitly
+    // subscribes and unsubscribes by connecting and disconnecting from the server.
+}
+
+// Users have to create a json object of this format and attach it to
+// the data field of their WebSocket message to interact with the server.
+export interface WebSocketRequest {
+    action: OrderWatcherAction;
+    signedOrder?: SignedOrder;
+    orderHash?: string;
+}
+
+// Users should expect a json object of this format in the data field
+// of the WebSocket messages that the server sends out.
+export interface WebSocketResponse {
+    action: OrderWatcherAction | null;
+    success: boolean;
+    result: any;
+}