import { cond } from './functions';
export declare const log: (...a: any[]) => void;
export declare const logStr: (msg: string, ...a: any[]) => void;
/**
 * Log something to console with optional message, then returns identical input.
 *
 * @example
 * Promise.all(pending)
 *    .then(x => logId(x, 'task: done'))
 *    .then(sendTask)
 */
export declare const logId: (x: any, msg?: string) => any;
/**
 * Creates a string for an error message for your function.
 * @param fnName name of your function
 * @param reqs list of type requirements
 * @param args arguments received by function
 *
 * @example
 * throw new Error(ErrorMsg(isEven, ['integer'], arguments))
 */
export declare function ErrorMsg(fnName: string, reqs: string[], args: any[]): string;
/**
 * Takes an array of boolean functions, an argument to run with the tests, and
 * and an optional error message.
 *
 * @example
 * ifOrThrow(100, [isType.int, isEven], `Value wasn't an even integer.`)
 */
export declare function ifOrThrow(ifs: cond[], arg: any, msg?: string): void;