feat: support eth_fillTransaction (#4098)

* feat: support fillTransaction

* w

* decorator

* decorator

* chore: changeset

Author: jxom

.changeset/beige-vans-move.md

@@ -0,0 +1,5 @@
+---
+"viem": minor
+---
+
+Hooked up `eth_fillTransaction` routing to `prepareTransactionRequest`, to reduce the RPC calls required to prepare a local transaction from 3-4, to 1 (if `eth_fillTransaction` is supported by the execution node).

.changeset/modern-eggs-prove.md

@@ -0,0 +1,5 @@
+---
+"viem": minor
+---
+
+Added `fillTransaction` action for `eth_fillTransaction` support.

pnpm-lock.yaml

@@ -7,11 +7,11 @@ catalog:
   '@types/react-dom': ^19
   react: ^19
   react-dom: ^19
-  typescript: ^5.9.2
+  typescript: 5.9.2
 minimumReleaseAge: 1440
 minimumReleaseAgeExclude:
   - '@vitest/*'
-  - glob
+  - glob  
   - hono
   - vitest
   - vocs

pnpm-workspace.yaml

@@ -27,6 +27,7 @@ test('exports actions', () => {
       "estimateFeesPerGas": [Function],
       "estimateGas": [Function],
       "estimateMaxPriorityFeePerGas": [Function],
+      "fillTransaction": [Function],
       "getAddresses": [Function],
       "getAutomine": [Function],
       "getBalance": [Function],

src/actions/index.test.ts

@@ -87,6 +87,12 @@ export {
   type EstimateMaxPriorityFeePerGasReturnType,
   estimateMaxPriorityFeePerGas,
 } from './public/estimateMaxPriorityFeePerGas.js'
+export {
+  type FillTransactionErrorType,
+  type FillTransactionParameters,
+  type FillTransactionReturnType,
+  fillTransaction,
+} from './public/fillTransaction.js'
 export {
   type GetBalanceErrorType,
   type GetBalanceParameters,