Fail on unsupported Etherscan networks immediately to better support the default provider.

Author: ricmoo

src.ts/providers/provider-etherscan.ts

@@ -46,6 +46,16 @@ import type { Networkish } from "./network.js";
 //import type { } from "./pagination";
 import type { TransactionRequest } from "./provider.js";
 
+// See: https://docs.etherscan.io/supported-chains
+const Supported = (
+    "1 11155111 17000 560048 2741 11124 33111 33139 42170 " +
+    "42161 421614 43114 43113 8453 84532 80069 80094 199 1029 81457 " +
+    "168587773 56 97 42220 11142220 252 2523 100 999 737373 747474 " +
+    "59144 59141 5000 5003 43521 143 10143 1287 1284 1285 10 " +
+    "11155420 204 5611 80002 137 534352 534351 1329 1328 146 14601 " +
+    "988 2201 1923 1924 167013 167000 130 1301 480 4801 51 50 324 300"
+).split(/ /g);
+
 const THROTTLE = 2000;
 
 function isPromise<T = any>(value: any): value is Promise<T> {
@@ -135,12 +145,16 @@ export class EtherscanProvider extends AbstractProvider {
      *  Creates a new **EtherscanBaseProvider**.
      */
     constructor(_network?: Networkish, _apiKey?: string) {
+
         const apiKey = (_apiKey != null) ? _apiKey: null;
 
         super();
 
         const network = Network.from(_network);
 
+        assertArgument(Supported.indexOf(`${ network.chainId }`) >= 0,
+          "unsupported network", "network", network);
+
         this.#plugin = network.getPlugin<EtherscanPlugin>(EtherscanPluginId);
 
         defineProperties<EtherscanProvider>(this, { apiKey, network });