/**
 * Get a channel user mode from their prefix.
 * @param prefixOrNick Prefix on its own (`@`, `+`, etc) or a nick `@Diamond`
 * @param supportedModes Object of channel modes `{ 'o': '@' }`
 * @returns Mode for prefix symbol
 */
export declare const modeFromPrefix: (prefixOrNick: string, supportedModes: Record<string, string>) => string;