/**
 * Compares two strings and returns the character differences between them.
 *
 * @param a - The first string to compare
 * @param b - The second string to compare
 * @returns An array of character differences, where characters prefixed with '-' are in string a but not in b,
 *          and characters prefixed with '+' are in string b but not in a
 *
 * @example
 * diff("abc", "bcd") // returns ["-a", "+d"]
 * diff("hello", "hallo") // returns ["-e", "+a"]
 *
 * @note Duplicates are removed as the comparison uses sets of unique characters
 */
export declare function diff(a: string, b: string): string[];
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