/**
 * The error values Excel can store in a cell — the single source of truth.
 *
 * This list used to exist twice: here (for `excel_find_errors`) and again as a
 * hand-written regex inside `patterns.ts` (for the post-edit health check).
 * They drifted, and the copy in `patterns.ts` had quietly lost `#N/A` and
 * `#NAME?` — its regex demanded a trailing `!`, which neither value has. The
 * result was that a workbook full of failed lookups passed the health check
 * while `excel_find_errors` reported the very same cells.
 *
 * It was also short. `findErrorCells` never consulted this list — it accepts
 * whatever error token the file carries — so it reported `#SPILL!` and friends
 * while the health check, which does derive from the list, could not. Every
 * token Excel is documented to write is therefore listed here.
 *
 * Anything that needs to recognise an error value reads it from here.
 */
export declare const EXCEL_ERROR_VALUES: readonly ['#DIV/0!', '#N/A', '#NAME?', '#NULL!', '#NUM!', '#REF!', '#VALUE!', '#GETTING_DATA', '#SPILL!', '#CALC!', '#FIELD!', '#BLOCKED!', '#UNKNOWN!', '#CONNECT!', '#BUSY!', '#PYTHON!', '#TIMEOUT!'];
/**
 * A regex source matching any error value, for callers that only have a string.
 *
 * Values are escaped (they contain `?` and `/`) and ordered longest first, so no
 * value can be shadowed by a shorter one that happens to be its prefix.
 */
export declare function excelErrorPattern(): string;
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