/**
 * DISPLAY-ONLY General number formatting for spreadsheet canvas and a11y
 * labels. This is not numeric arithmetic and must never feed formula-bar /
 * cell-edit `input`, stored cells, formula results, or serialized exports.
 *
 * Policy for independent review:
 * IEEE-754 cannot represent many decimal fractions exactly, so values such as
 * `110.00000000000001` and `0.1 + 0.2` leak binary residue through `String(n)`.
 * General display therefore collapses a finite number to 15 significant decimal
 * digits — the same bound spreadsheet General uses — via
 * `String(Number(value.toPrecision(15)))`.
 *
 * That mapping yields `110` / `220` / `0.3` for the noisy cases while keeping
 * exponent-scale values (`1e-20`, `1e21`) and ~15-digit legitimate precision.
 * Integers stringify without a decimal; `-0` displays as `0`; non-finite
 * numbers, dates, booleans, errors, and strings keep their existing labels.
 *
 * Do not reuse `Intl.NumberFormat({ maximumFractionDigits: 12 })` from the
 * artifact-tool renderer: 12 fraction digits rounds `1e-20` to `0` and truncates
 * high-precision values that General should still show.
 */
export declare function formatSpreadsheetGeneralDisplay(value: unknown): string;
/** Exact edit/formula-bar source. Numbers stay `String(value)` with no General collapse. */
export declare function spreadsheetCellEditSource(value: unknown): string;