v3.8.1: feat() add type guard and type for ws orderbook events

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "bybit-api",
-  "version": "3.8.0",
+  "version": "3.8.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "bybit-api",
-      "version": "3.8.0",
+      "version": "3.8.1",
       "license": "MIT",
       "dependencies": {
         "axios": "^0.21.0",
@@ -2027,9 +2027,9 @@
       "dev": true
     },
     "node_modules/axios": {
-      "version": "0.21.2",
-      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.2.tgz",
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+      "version": "0.21.4",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.4.tgz",
+      "integrity": "sha512-ut5vewkiu8jjGBdqpM44XxjuCjq9LAKeHVmoVfHVzy8eHgxxq8SbAVQNovDA8mVi05kP0Ea/n/UzcSHcTJQfNg==",
       "dependencies": {
         "follow-redirects": "^1.14.0"
       }
@@ -3350,9 +3350,9 @@
       "dev": true
     },
     "node_modules/follow-redirects": {
-      "version": "1.14.9",
-      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.14.9.tgz",
-      "integrity": "sha512-MQDfihBQYMcyy5dhRDJUHcw7lb2Pv/TuE6xP1vyraLukNDHKbDxDNaOE3NbCAdKQApno+GPRyo1YAp89yCjK4w==",
+      "version": "1.15.5",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.5.tgz",
+      "integrity": "sha512-vSFWUON1B+yAw1VN4xMfxgn5fTUiaOzAJCKBwIIgT/+7CuGy9+r+5gITvP62j3RmaD5Ph65UaERdOSRGUzZtgw==",
       "funding": [
         {
           "type": "individual",
@@ -8885,9 +8885,9 @@
       "dev": true
     },
     "axios": {
-      "version": "0.21.2",
-      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.2.tgz",
-      "integrity": "sha512-87otirqUw3e8CzHTMO+/9kh/FSgXt/eVDvipijwDtEuwbkySWZ9SBm6VEubmJ/kLKEoLQV/POhxXFb66bfekfg==",
+      "version": "0.21.4",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.4.tgz",
+      "integrity": "sha512-ut5vewkiu8jjGBdqpM44XxjuCjq9LAKeHVmoVfHVzy8eHgxxq8SbAVQNovDA8mVi05kP0Ea/n/UzcSHcTJQfNg==",
       "requires": {
         "follow-redirects": "^1.14.0"
       }
@@ -9926,9 +9926,9 @@
       "dev": true
     },
     "follow-redirects": {
-      "version": "1.14.9",
-      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.14.9.tgz",
-      "integrity": "sha512-MQDfihBQYMcyy5dhRDJUHcw7lb2Pv/TuE6xP1vyraLukNDHKbDxDNaOE3NbCAdKQApno+GPRyo1YAp89yCjK4w=="
+      "version": "1.15.5",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.5.tgz",
+      "integrity": "sha512-vSFWUON1B+yAw1VN4xMfxgn5fTUiaOzAJCKBwIIgT/+7CuGy9+r+5gITvP62j3RmaD5Ph65UaERdOSRGUzZtgw=="
     },
     "form-data": {
       "version": "3.0.1",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "bybit-api",
-  "version": "3.8.0",
+  "version": "3.8.1",
   "description": "Complete & robust Node.js SDK for Bybit's REST APIs and WebSockets, with TypeScript & strong end to end tests.",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",

src/types/websocket.events.ts

@@ -13,6 +13,35 @@ import {
 } from './v5-shared';
 import { WsKey } from './websockets';
 
+export interface WSOrderbookEventV5 {
+  topic: string;
+  /** Event timestamp */
+  ts: number;
+  type: 'delta' | 'snapshot';
+  data: {
+    /** Symbol */
+    s: string;
+    /** [price, qty][] */
+    b: [string, string][];
+    /** [price, qty][] */
+    a: [string, string][];
+    /** Update ID */
+    u: number;
+    /**
+     * Cross sequence
+     */
+    seq: number;
+  };
+  /**
+   * matching engine timestamp (correlated with T from public trade channel)
+   */
+  cts: number;
+  /**
+   * Internal reference, can be used to determine if this is spot/linear/inverse/etc
+   */
+  wsKey: WsKey;
+}
+
 export interface WSAccountOrderV5 {
   qty: string;
   price: string;

src/util/index.ts

@@ -1,5 +1,6 @@
 export * from './BaseRestClient';
-export * from './requestUtils';
-export * from './WsStore';
 export * from './logger';
+export * from './requestUtils';
+export * from './typeGuards';
 export * from './websocket-util';
+export * from './WsStore';

src/util/typeGuards.ts

@@ -0,0 +1,29 @@
+/**
+ * Use type guards to narrow down types with minimal efforts.
+ */
+
+import { WSOrderbookEventV5 } from '../types/websocket.events';
+
+/**
+ * Type guard to detect a V5 orderbook event (delta & snapshots)
+ *
+ * @param event
+ * @returns
+ */
+export function isWsOrderbookEventV5(
+  event: unknown,
+): event is WSOrderbookEventV5 {
+  if (
+    typeof event !== 'object' ||
+    !event ||
+    typeof event['topic'] !== 'string' ||
+    typeof event['type'] !== 'string'
+  ) {
+    return false;
+  }
+
+  return (
+    ['delta', 'snapshot'].includes(event['type']) &&
+    event['topic'].startsWith('orderbook')
+  );
+}