feat(js): add l1TokenAddress wallet and signer

content/10.js/00.ethers/05.api/10.v5/20.accounts/01.wallet.md

@@ -1464,6 +1464,42 @@ const WITHDRAWAL_HASH = "<WITHDRAWAL_TX_HASH>";
 const isFinalized = await wallet.isWithdrawalFinalized(WITHDRAWAL_HASH);
 ```
 
+### `l1TokenAddress`
+
+Returns the L1 token address equivalent for a L2 token address as they are not equal.
+ETH address is set to zero address.
+
+::callout{icon="i-heroicons-exclamation-triangle" color="amber"}
+Only works for tokens bridged on default ZKsync Era bridges.
+::
+
+#### Inputs
+
+| Parameter | Type      | Description                     |
+| --------- | --------- |---------------------------------|
+| `token`   | `Address` | The address of the token on L2. |
+
+```ts
+async l1TokenAddress(token: Address): Promise<string>
+```
+
+#### Example
+
+```ts
+import { Wallet, Provider, utils } from "zksync-ethers";
+import { ethers } from "ethers";
+
+const PRIVATE_KEY = "<WALLET_PRIVATE_KEY>";
+
+const provider = Provider.getDefaultProvider(types.Network.Sepolia);
+const ethProvider = ethers.getDefaultProvider("sepolia");
+const wallet = new Wallet(PRIVATE_KEY, provider, ethProvider);
+
+const tokenL2 = "0xe1134444211593Cfda9fc9eCc7B43208615556E2";
+
+console.log(`Token L1 address: ${await wallet.l1TokenAddress(tokenL1)}`);
+```
+
 ### `l2TokenAddress`
 
 Returns the L2 token address equivalent for a L1 token address as they are not equal. ETH's address is set to zero address.

content/10.js/00.ethers/05.api/10.v5/20.accounts/03.l1signer.md

@@ -1007,6 +1007,39 @@ const WITHDRAWAL_HASH = "<WITHDRAWAL_TX_HASH>";
 const isFinalized = await signer.isWithdrawalFinalized(WITHDRAWAL_HASH);
 ```
 
+### `l1TokenAddress`
+
+Returns the L1 token address equivalent for a L2 token address as they are not equal.
+ETH address is set to zero address.
+
+::callout{icon="i-heroicons-exclamation-triangle" color="amber"}
+Only works for tokens bridged on default ZKsync Era bridges.
+::
+
+#### Inputs
+
+| Parameter | Type      | Description                     |
+| --------- | --------- |---------------------------------|
+| `token`   | `Address` | The address of the token on L2. |
+
+```ts
+async l1TokenAddress(token: Address): Promise<string>
+```
+
+#### Example
+
+```ts
+import { Provider, L1Signer, types } from "zksync-ethers";
+import { ethers } from "ethers";
+
+const browserProvider = new ethers.providers.Web3Provider(window.ethereum);
+const signer = L1Signer.from(browserProvider.getSigner(), Provider.getDefaultProvider(types.Network.Sepolia));
+
+const tokenL2 = "0xe1134444211593Cfda9fc9eCc7B43208615556E2";
+
+console.log(`Token L1 address: ${await wallet.l1TokenAddress(tokenL1)}`);
+```
+
 ### `l2TokenAddress`
 
 Returns the L2 token address equivalent for a L1 token address as they are not equal. ETH's address is set to zero address.