Fix types and comments

__tests__/ain.test.ts

@@ -82,6 +82,7 @@ describe('ain-js', function() {
 
     it('getPeerCandidateInfo', async function() {
       const info = await ain.net.getPeerCandidateInfo();
+      expect(info).not.toBeNull();
       expect(info.address).not.toBeNull();
       expect(info.isAvailableForConnection).toBe(true);
       expect(info.peerCandidateJsonRpcUrlList).not.toBeNull();

src/ain.ts

@@ -210,7 +210,7 @@ export default class Ain {
   }
 
   /**
-   * Fetches pending transaction.
+   * Fetches pending transactions.
    * @returns {Promise<any>}
    */
   getPendingTransactions(): Promise<any> {
@@ -240,7 +240,7 @@ export default class Ain {
    * @param {number} index The transaction index in the block
    * @returns {Promise<TransactionInfo>}
    */
-  getTransactionByBlockHashAndIndex(blockHash: string, index: Number): Promise<TransactionInfo> {
+  getTransactionByBlockHashAndIndex(blockHash: string, index: number): Promise<TransactionInfo> {
     return this.provider.send('ain_getTransactionByBlockHashAndIndex', { block_hash: blockHash, index });
   }
 
@@ -250,7 +250,7 @@ export default class Ain {
    * @param {number} index The transaction index in the block
    * @returns {Promise<TransactionInfo>}
    */
-  getTransactionByBlockNumberAndIndex(blockNumber: Number, index: Number): Promise<TransactionInfo> {
+  getTransactionByBlockNumberAndIndex(blockNumber: number, index: number): Promise<TransactionInfo> {
     return this.provider.send('ain_getTransactionByBlockNumberAndIndex', { block_number: blockNumber, index });
   }
 

src/provider.ts

@@ -39,9 +39,9 @@ export default class Provider {
 
   /**
    * Fetches the blockchain node's address.
-   * @returns {Promise<number>} The address value.
+   * @returns {Promise<string>} The return value of the blockchain API.
    */
-  getAddress(): Promise<number> {
+  getAddress(): Promise<string> {
     return this.send('ain_getAddress', {})
   }
 

src/wallet.ts

@@ -269,7 +269,7 @@ export default class Wallet {
   }
 
   /**
-   * Fetches an account's timestamp value, which is the current transaction count of the account.
+   * Fetches an account's timestamp value, which is the timestamp of the last transaction signed by the account with nonce = -2.
    * @param {object} args The ferch options.
    * It may contain a string 'address' value and a string 'from' value.
    * The 'address' is the address of the account to get the timestamp of,