initial commit, add bitget rest api and websockets connector

test/response.util.ts

@@ -0,0 +1,43 @@
+import { API_ERROR_CODE } from '../src';
+
+const SUCCESS_MSG_REGEX = /success/gim;
+
+export function successResponseString() {
+  return {
+    data: expect.any(String),
+    ...sucessEmptyResponseObject(),
+  };
+}
+
+export function sucessEmptyResponseObject() {
+  return {
+    code: API_ERROR_CODE.SUCCESS,
+    msg: expect.stringMatching(SUCCESS_MSG_REGEX),
+  };
+}
+
+export function errorResponseObject(
+  result: null | any = null,
+  ret_code: number,
+  ret_msg: string
+) {
+  return {
+    result,
+    ret_code,
+    ret_msg,
+  };
+}
+
+export function errorResponseObjectV3(
+  result: null | any = null,
+  retCode: number
+) {
+  return {
+    result,
+    retCode: retCode,
+  };
+}
+
+export function notAuthenticatedError() {
+  return new Error('Private endpoints require api and private keys set');
+}