/**
 * CSV encoding helpers that are safe against spreadsheet formula injection
 * (CWE-1236). Use these for every CSV export that an operator might open in
 * Excel, Google Sheets, or LibreOffice Calc.
 *
 * Two layers of defense:
 *
 * 1. **Structural quoting** - values containing a delimiter (`,`), a double
 *    quote (`"`), or a line break (`\n` / `\r`) are wrapped in double quotes
 *    with embedded quotes doubled (RFC 4180).
 * 2. **Formula neutralization** - values whose first character is one of
 *    `=`, `+`, `-`, `@`, tab, or carriage return are prefixed with a single
 *    quote (`'`) so spreadsheet applications treat them as text instead of
 *    executing them as formulas (e.g. `=HYPERLINK(...)`, `=cmd|'/c calc'!A1`).
 */
/**
 * Encode a single value as a CSV cell.
 *
 * `null` and `undefined` encode as an empty string. Everything else is
 * stringified via `String(value)`, neutralized against formula injection,
 * and quoted when it contains a delimiter, quote, or line break.
 */
export declare function toCsvCell(value: unknown): string;
/**
 * Encode an array of values as a single CSV row (no trailing newline).
 */
export declare function toCsvRow(values: readonly unknown[]): string;
//# sourceMappingURL=csv.d.ts.map