/**
 * Excel-style A1 cell address helpers.
 *
 * Public cell coordinates in gridgram are **1-based** and can be
 * written as either:
 *   - A1 string:     "A1", "B3", "AA100" — case-insensitive
 *   - numeric tuple: [1, 1] (column 1, row 1)
 *   - numeric obj:   { col: 1, row: 1 }
 *
 * A1 = column 1, row 1 = top-left. Columns carry over the standard
 * Excel way: A..Z, AA..AZ, BA..BZ, …, ZZ, AAA…
 *
 * Internally gridgram normalizes every input to a 0-based `{ col, row }`
 * (see auto-position.ts) so layout math stays simple.
 */
export interface OneBased {
    /** 1-based column (A=1). */
    col: number;
    /** 1-based row (top=1). */
    row: number;
}
/** True if `s` is syntactically a valid A1 address (letters + digits, row ≥ 1). */
export declare function isA1(s: string): boolean;
/**
 * Parse a string as an A1 cell address to 1-based `{col, row}`. Throws
 * with a readable message on a malformed address.
 *
 * Accepts lower-case (`"aa100"`) but normalises to column math that
 * treats letters as case-insensitive.
 */
export declare function parseA1(s: string): OneBased;
/** Serialise 1-based `{col, row}` back to an A1 address ("A1", "AA100"). */
export declare function formatA1(col: number, row: number): string;
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