feat: Add gasLimitNoBuffer to transactionMeta

packages/transaction-controller/CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `gasLimitNoBuffer` property to `TransactionMeta` type ([#5113](https://github.com/MetaMask/core/pull/5113))
+  - `gasLimitNoBuffer` is the estimated gas (via `eth_estimateGas`) for the transaction without buffer.
+
 ## [42.1.0]
 
 ### Added

packages/transaction-controller/src/types.ts

@@ -184,6 +184,11 @@ type TransactionMetaBase = {
   /** Whether the gas fee estimates have been checked at least once. */
   gasFeeEstimatesLoaded?: boolean;
 
+  /**
+   * The estimated gas for the transaction without buffer.
+   */
+  gasLimitNoBuffer?: string;
+
   /**
    * A hex string of the transaction hash, used to identify the transaction on the network.
    */

packages/transaction-controller/src/utils/gas.test.ts

@@ -197,6 +197,9 @@ describe('gas', () => {
         expect(updateGasRequest.txMeta.originalGasEstimate).toBe(
           updateGasRequest.txMeta.txParams.gas,
         );
+        expect(updateGasRequest.txMeta.gasLimitNoBuffer).toBe(
+          toHex(estimatedGas),
+        );
       });
 
       it('to padded estimate using chain multiplier if padded estimate less than percentage of block gas limit', async () => {
@@ -219,6 +222,9 @@ describe('gas', () => {
         expect(updateGasRequest.txMeta.originalGasEstimate).toBe(
           updateGasRequest.txMeta.txParams.gas,
         );
+        expect(updateGasRequest.txMeta.gasLimitNoBuffer).toBe(
+          toHex(estimatedGas),
+        );
       });
 
       it('to percentage of block gas limit if padded estimate only is greater than percentage of block gas limit', async () => {
@@ -241,6 +247,9 @@ describe('gas', () => {
         expect(updateGasRequest.txMeta.originalGasEstimate).toBe(
           updateGasRequest.txMeta.txParams.gas,
         );
+        expect(updateGasRequest.txMeta.gasLimitNoBuffer).toBe(
+          toHex(estimatedGas),
+        );
       });
 
       describe('to fixed value', () => {

packages/transaction-controller/src/utils/gas.ts

@@ -32,10 +32,11 @@ export async function updateGas(request: UpdateGasRequest) {
   const { txMeta } = request;
   const initialParams = { ...txMeta.txParams };
 
-  const [gas, simulationFails] = await getGas(request);
+  const [gas, simulationFails, gasLimitNoBuffer] = await getGas(request);
 
   txMeta.txParams.gas = gas;
   txMeta.simulationFails = simulationFails;
+  txMeta.gasLimitNoBuffer = gasLimitNoBuffer;
 
   if (!initialParams.gas) {
     txMeta.originalGasEstimate = txMeta.txParams.gas;
@@ -132,7 +133,7 @@ export function addGasBuffer(
 
 async function getGas(
   request: UpdateGasRequest,
-): Promise<[string, TransactionMeta['simulationFails']?]> {
+): Promise<[string, TransactionMeta['simulationFails']?, string?]> {
   const { isCustomNetwork, chainId, txMeta } = request;
 
   if (txMeta.txParams.gas) {
@@ -170,7 +171,7 @@ async function getGas(
     bufferMultiplier,
   );
 
-  return [bufferedGas, simulationFails];
+  return [bufferedGas, simulationFails, estimatedGas];
 }
 
 async function requiresFixedGas({