type UpperAlphabetic = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z";
type AlphanumericDigits = "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" | "0";
/**
 * Return underscore if it is allowed between provided characters,
 * trail and lead underscore are allowed, empty string is considered
 * as the beginning of a string.
 */
type SnakeUnderscore<First extends PropertyKey, Second extends PropertyKey> = First extends AlphanumericDigits ? Second extends UpperAlphabetic ? "_" : "" : First extends UpperAlphabetic | "" | "_" ? "" : Second extends UpperAlphabetic | AlphanumericDigits ? "_" : "";
/**
 * Convert string literal type to snake_case
 */
export type CamelToSnakeCase<S extends PropertyKey, Previous extends PropertyKey = ""> = S extends number ? S : S extends `__${infer K}` ? `__${CamelToSnakeCase<K>}` : S extends `${infer J}__${infer L}` ? `${CamelToSnakeCase<J>}__${CamelToSnakeCase<L>}` : S extends `${infer First}${infer Second}${infer Rest}` ? `${SnakeUnderscore<Previous, First>}${Lowercase<First>}${SnakeUnderscore<First, Second>}${Lowercase<Second>}${CamelToSnakeCase<Rest, First>}` : S extends `${infer First}` ? `${SnakeUnderscore<Previous, First>}${Lowercase<First>}` : "";
export {};
//# sourceMappingURL=util-types.d.ts.map