feat: erc7821 (#3169)

* chore: skip test

* wip: checkpoint

* wip: checkpoint

* wip: checkpoint

* wip: checkpoint

* wip: checkpoint

* docs

* chore: changeset

* chore: changeset

* w

* w

.changeset/tiny-badgers-fry.md

@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+**Experimental:** Added experimental ERC-7821 actions.

contracts/src/ERC7821Example.sol

@@ -0,0 +1,25 @@
+pragma solidity ^0.8.17;
+
+// SPDX-License-Identifier: UNLICENSED
+
+import "solady/accounts/ERC7821.sol";
+
+contract ERC7821Example is ERC7821 {
+    event OpData(bytes opData);
+
+    function _execute(
+        bytes32 mode,
+        bytes calldata executionData,
+        Call[] calldata calls,
+        bytes calldata opData
+    ) internal virtual override {
+        mode = mode;
+        executionData = executionData;
+
+        require(msg.sender == address(this));
+        if (opData.length > 0) {
+            emit OpData(opData);
+        }
+        return _execute(calls, bytes32(0));
+    }
+}

package.json

@@ -96,7 +96,7 @@
       "src": {
         "entry": [
           "index.ts!",
-          "{account-abstraction,accounts,actions,celo,chains,ens,experimental,experimental/erc7739,linea,node,nonce,op-stack,siwe,utils,window,zksync}/index.ts!",
+          "{account-abstraction,accounts,actions,celo,chains,ens,experimental,experimental/erc7739,experimental/erc7821,linea,node,nonce,op-stack,siwe,utils,window,zksync}/index.ts!",
           "chains/utils.ts!"
         ],
         "ignore": ["node/trustedSetups_cjs.ts"]

site/pages/experimental/erc7821/client.md

@@ -0,0 +1,16 @@
+# Extending Client with ERC-7821 Actions [Setting up your Viem Client]
+
+To use the experimental functionality of [ERC-7821](https://eips.ethereum.org/EIPS/eip-7821), you can extend your existing (or new) Viem Client with experimental [ERC-7821](https://eips.ethereum.org/EIPS/eip-7821) Actions.
+
+```ts
+import { createClient, http } from 'viem'
+import { mainnet } from 'viem/chains'
+import { erc7821Actions } from 'viem/experimental' // [!code focus]
+
+const client = createClient({
+  chain: mainnet,
+  transport: http(),
+}).extend(erc7821Actions()) // [!code focus]
+
+const hash = await client.execute({/* ... */})
+```