/** "table" = a table/view identifier — only BigQuery treats these differently from everything
 *  else (columns, aliases, CTE names, struct/field names, …), which is "other". */
export type IdentKind = "table" | "other";
/** "ascii-lower" folds [A-Z] only, passing every other character through, for dialects whose
 *  engines compare identifiers ASCII-case-insensitively (sqlite, postgres, duckdb, redshift):
 *  there `Ä` and `ä` are DISTINCT identifiers, and a Unicode-wide fold would conflate them (#22). */
type CaseFold = "lower" | "upper" | "preserve" | "ascii-lower";
export interface FoldRule {
    /** [open, close] delimiter pairs this dialect recognizes, tried in order. */
    delimiters: readonly (readonly [string, string])[];
    /** Case fold applied to an unquoted identifier. */
    unquoted: "lower" | "upper" | "ascii-lower";
    /** Case fold applied to a quoted (delimited) identifier. */
    quoted: CaseFold;
    /** BigQuery only: table identifiers preserve case whether or not they're backtick-quoted —
     *  backticks there are an escaping mechanism, not a case-quoting one. When set, this
     *  overrides both `unquoted`/`quoted` for kind:"table". */
    tableCase?: "preserve";
    /** How an escaped delimiter is written inside a quoted identifier's body.
     *  "double" (default) — the close delimiter is escaped by doubling it (`""`→`"`, `` `` ``→`` ` ``,
     *  `]]`→`]`).
     *  "backslash" — BigQuery only (see its rule comment): quoted identifiers use string-literal escape
     *  sequences, not doubling. */
    escapeStyle?: "double" | "backslash";
}
/** Fold an identifier to its identity key under an explicit rule (the engine each dialect folder binds). */
export declare function foldWith(rule: FoldRule, raw: string, kind?: IdentKind): string;
/** Presentation twin of foldWith: strip delimiters, no case change. */
export declare function displayWith(rule: FoldRule, raw: string): string;
export {};