/**
 * Creates an array of values by splitting the input value using the specified separator.
 *
 * @param value The input value to be split into an array.
 * @param separator The separator used to split the input value.
 * @param def The default value to be returned if the input value is invalid. Defaults to an empty array ([]).
 *
 * @remark
 * If the input value is invalid (null, undefined, or not a string), it returns the default value as is.
 * If an error occurs during splitting, it returns the default value as is.
 *
 * @returns An array of values resulting from splitting the input value by the specified separator,
 *          or the default value as is if it's invalid or an error occurs during splitting.
 *
 * @example
 * // Example 1: When the value exists
 * const result1 = splitBy("apple,banana,orange", ",");
 * // Result: ["apple", "banana", "orange"]
 *
 * // Example 2: When the value is undefined, using the default value
 * const result2 = splitBy(undefined, ",");
 * // Result: []
 *
 * // Example 3: When the value is null, with no default value
 * const result3 = splitBy(null, ",");
 * // Result: []
 *
 * // Example 4: When the value is a number
 * const result4 = splitBy(123, ",");
 * // Result: []
 *
 * // Example 5: When an invalid separator is used
 * const result5 = splitBy("apple,banana,orange", "[");
 * // Result: ["apple,banana,orange"]
 */
export declare function split(value: unknown, separator: string | RegExp, def?: string[]): string[];