/**
 * Convenience function that gets the RPC URL for a given network ID. If the network ID is unknown, null is returned.
 * @param {string} networkID - a network ID. Should be one of betanet, localnet, mainnet or testnet.
 * @returns {string | null} the RPC URL for a given network ID, or null if the network ID is unknown.
 */
export default function rpcURLFromNetworkID(networkID: string): string | null;
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