feat: add getConfirmedTransaction and getConfirmedSignaturesForAddress

web3.js/module.flow.js

@@ -111,6 +111,17 @@ declare module '@solana/web3.js' {
     }>,
   };
 
+  declare export type ConfirmedTransaction = {
+    slot: number,
+    transaction: Transaction,
+    meta: {
+      fee: number,
+      preBalances: Array<number>,
+      postBalances: Array<number>,
+      err: TransactionError | null,
+    } | null,
+  };
+
   declare export type KeyedAccountInfo = {
     accountId: PublicKey,
     accountInfo: AccountInfo,
@@ -197,6 +208,14 @@ declare module '@solana/web3.js' {
     getBalance(publicKey: PublicKey, commitment: ?Commitment): Promise<number>;
     getClusterNodes(): Promise<Array<ContactInfo>>;
     getConfirmedBlock(slot: number): Promise<ConfirmedBlock>;
+    getConfirmedTransaction(
+      signature: TransactionSignature,
+    ): Promise<ConfirmedTransaction | null>;
+    getConfirmedSignaturesForAddress(
+      address: PublicKey,
+      startSlot: number,
+      endSlot: number,
+    ): Promise<Array<TransactionSignature>>;
     getVoteAccounts(commitment: ?Commitment): Promise<VoteAccountStatus>;
     confirmTransactionAndContext(
       signature: TransactionSignature,