Add: switchChain metamask helper

JoinColony · Nov 30, 2021 · fb07e4c · fb07e4c
1 parent 71029c6
commit fb07e4c
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diff --git a/packages/@purser/metamask/src/helpers.ts b/packages/@purser/metamask/src/helpers.ts
@@ -1,3 +1,5 @@
+import { hexlify, hexStripZeros } from 'ethers/utils';
+
 import { helpers as messages } from './messages';
 
 import {
@@ -140,3 +142,15 @@ export const setStateEventObserver = (
   const { ethereum } = anyGlobal;
   ethereum.on(observableEvent, callback);
 };
+
+export const switchChain = async (chainId: number): Promise<void> => {
+  const { ethereum } = anyGlobal;
+  return ethereum.request({
+    method: EthereumRequestMethods.SwitchChain,
+    /*
+     * @NOTE Need to also strip zeros since `hexlify` returns a signed hex string
+     * which is not something Metamask likes as a chain Id
+     */
+    params: [{ chainId: hexStripZeros(hexlify(chainId)) }],
+  });
+};
diff --git a/packages/@purser/metamask/src/types.ts b/packages/@purser/metamask/src/types.ts
@@ -42,4 +42,6 @@ export enum EthereumRequestMethods {
   Accounts = 'eth_accounts',
   RequestAccounts = 'eth_requestAccounts',
   WalletPermissions = 'wallet_getPermissions',
+  SwitchChain = 'wallet_switchEthereumChain',
+  AddNewChain = 'wallet_addEthereumChain',
 }