/**
 * Fetches the balance of a specified SPL token for a given wallet address.
 *
 * @param rpcUrl - The URL of the Solana RPC endpoint.
 * @param ownerAddress - The public key of the wallet owner.
 * @param mintAddress - The mint address of the SPL token.
 * @returns The balance of the SPL token in the specified wallet.
 *
 * @example
 * ```typescript
 * const rpcUrl = 'https://rpc.helius.xyz/?api-key=<API_KEY>'
 * const ownerAddress = 'EPiCHbeCzokXifRK6m91uwFM5A5XVoS6cgwM2JuLXVdC'
 * const mintAddress = 'CvB1ztJvpYQPvdPBePtRzjL4aQidjydtUz61NWgcgQtP'
 *
 * const result = await getSPLTokenBalance(rpcUrl, ownerAddress, mintAddress)
 * console.log(result)
 * ```
 */
export declare const getSPLTokenBalance: (rpcUrl: string, ownerAddress: string, mintAddress: string) => Promise<number>;