feat(web3.js): add support for get stake minimum delegation (#26682)

web3.js/src/connection.ts

@@ -453,6 +453,14 @@ export type GetBlockConfig = {
   maxSupportedTransactionVersion?: number;
 };
 
+/**
+ * Configuration object for changing `getStakeMinimumDelegation` query behavior
+ */
+export type GetStakeMinimumDelegationConfig = {
+  /** The level of commitment desired */
+  commitment?: Commitment;
+};
+
 /**
  * Configuration object for changing `getBlockHeight` query behavior
  */
@@ -4317,6 +4325,25 @@ export class Connection {
     }
   }
 
+  /**
+   * get the stake minimum delegation
+   */
+  async getStakeMinimumDelegation(
+    config?: GetStakeMinimumDelegationConfig,
+  ): Promise<RpcResponseAndContext<number>> {
+    const {commitment, config: configArg} = extractCommitmentFromConfig(config);
+    const args = this._buildArgs([], commitment, 'base64', configArg);
+    const unsafeRes = await this._rpcRequest('getStakeMinimumDelegation', args);
+    const res = create(unsafeRes, jsonRpcResultAndContext(number()));
+    if ('error' in res) {
+      throw new SolanaJSONRPCError(
+        res.error,
+        `failed to get stake minimum delegation`,
+      );
+    }
+    return res.result;
+  }
+
   /**
    * Simulate a transaction
    */

web3.js/test/connection.test.ts

@@ -3804,6 +3804,10 @@ describe('Connection', function () {
   }
 
   if (process.env.TEST_LIVE) {
+    it('getStakeMinimumDelegation', async () => {
+      const {value} = await connection.getStakeMinimumDelegation();
+      expect(value).to.be.a('number');
+    });
     it('simulate transaction with message', async () => {
       connection._commitment = 'confirmed';
 

web3.js/test/stake-program.test.ts

@@ -382,13 +382,15 @@ describe('StakeProgram', () => {
   if (process.env.TEST_LIVE) {
     it('live staking actions', async () => {
       const connection = new Connection(url, 'confirmed');
-      const SYSTEM_ACCOUNT_MIN_BALANCE =
+      const [
-        await connection.getMinimumBalanceForRentExemption(0);
+        SYSTEM_ACCOUNT_MIN_BALANCE,
-      const STAKE_ACCOUNT_MIN_BALANCE =
+        STAKE_ACCOUNT_MIN_BALANCE,
-        await connection.getMinimumBalanceForRentExemption(StakeProgram.space);
+        {value: MIN_STAKE_DELEGATION},
-
+      ] = await Promise.all([
-      // todo: use `Connection.getMinimumStakeDelegation` when implemented
+        connection.getMinimumBalanceForRentExemption(0),
-      const MIN_STAKE_DELEGATION = LAMPORTS_PER_SOL;
+        connection.getMinimumBalanceForRentExemption(StakeProgram.space),
+        connection.getStakeMinimumDelegation(),
+      ]);
 
       const voteAccounts = await connection.getVoteAccounts();
       const voteAccount = voteAccounts.current.concat(