import { MessageFunctionType, Result } from '../types';
export interface ToBooleanErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const TO_BOOLEAN_ERRORS: ToBooleanErrors;
/**
 * Convert the input string to a boolean.
 * Everything except for '0',
 * 'false' and '' returns true.
 * In strict mode only '1' and 'true' return true.
 *
 * @param target
 * @param strict
 */
export declare function toBoolean(target: string, strict: boolean): Result<boolean | undefined>;