Fix URL API error on the browser

The SDK uses a Node implementation of the URL API which is not
complementary to the native browser implementation. I have added
a conditional that if you have window.URL available then use it,
and if you don't have it then fallback to the Node implementation

typescript/src/lib/electrum/client.ts

@@ -15,12 +15,15 @@ import {
 } from "../bitcoin"
 import Electrum from "electrum-client-js"
 import { BigNumber } from "ethers"
-import { URL } from "url"
+import { URL as nodeURL } from "url"
 import { backoffRetrier, Hex, RetrierFn } from "../utils"
 
 import MainnetElectrumUrls from "./urls/mainnet.json"
 import TestnetElectrumUrls from "./urls/testnet.json"
 
+const browserURL = window.URL
+const URL = nodeURL ?? browserURL
+
 /**
  * Represents a set of credentials required to establish an Electrum connection.
  */
@@ -143,6 +146,7 @@ export class ElectrumClient implements BitcoinClient {
    */
   private static parseElectrumCredentials(url: string): ElectrumCredentials {
     const urlObj = new URL(url)
+    console.log({url, urlObj})
 
     return {
       host: urlObj.hostname,

typescript/tsconfig.json

@@ -2,7 +2,7 @@
   "compilerOptions": {
     "target": "ES2017",
     "module": "commonjs",
-    "lib": ["es2020"],
+    "lib": ["es2020", "dom"],
     "declaration": true,
     "declarationMap": true,
     "sourceMap": true,