/**
 * Shared, RFC-4180-aware delimiter-separated-value helpers.
 *
 * Consolidates quote-aware field counting/splitting that was previously
 * duplicated across csvProcessor.ts and fileDetector.ts (#359), and adds
 * delimiter detection so TSV / semicolon / pipe files parse correctly (#361).
 * Keeping these in one module prevents the same quoting edge case from having
 * to be fixed in three places and drifting out of sync.
 */
/** Delimiter candidates, in tie-break preference order (comma first). */
export declare const CANDIDATE_DELIMITERS: readonly [",", "\t", ";", "|"];
/**
 * Split a single line into fields, respecting RFC-4180 quoting: a delimiter
 * inside a `"…"` quoted field does not split, and `""` is an escaped quote.
 */
export declare function splitCSVFields(line: string, delimiter?: string): string[];
/** Count fields in a single line, respecting RFC-4180 quoting. */
export declare function countCSVColumns(line: string, delimiter?: string): number;
/**
 * Detect the delimiter of DSV content by testing comma/tab/semicolon/pipe
 * against up to 5 sampled non-empty lines and keeping the candidate with the
 * most consistent (>1) column count. Comma wins ties and the "nothing splits"
 * case, so plain CSVs are never reclassified. An optional extension hint
 * (`tsv` → tab, `psv` → pipe) breaks ambiguity in the file's favor.
 */
export declare function detectDelimiter(lines: string[], extensionHint?: string): string;