/**
 * A tiny, JavaScript-free evaluator for the most common AcroForm field
 * calculation: Acrobat's built-in `AFSimple_Calculate`. The vendored
 * `pdfium.wasm` has no JS engine, so calculate actions (`/AA/C`) are read but
 * never run; this recomputes the common cases on the client instead. Arbitrary
 * custom field JavaScript is intentionally not supported.
 *
 */
/** Reduction operation of an `AFSimple_Calculate` action. */
export type FormCalcOp = 'SUM' | 'PRD' | 'AVG' | 'MIN' | 'MAX';
/** A parsed `AFSimple_Calculate(op, [fields])` calculation. */
export interface FormCalcSpec {
    readonly op: FormCalcOp;
    /** Fully-qualified names of the operand fields. */
    readonly fields: readonly string[];
}
/**
 * Parses a calculate-action JavaScript source into a {@link FormCalcSpec}, or
 * returns `null` when it is not a recognized `AFSimple_Calculate` call (custom
 * scripts are left untouched).
 * @param js - The js value (string or  or undefined).
 * @returns The resulting FormCalcSpec or `null`.
 *
 */
export declare function parseCalcAction(js: string | null | undefined): FormCalcSpec | null;
/**
 * Parses a form-field display value to a number, stripping thousands
 * separators, currency symbols and other non-numeric decoration. Returns `null`
 * for blank or unparseable values.
 * @param value - The value to use.
 * @returns The resulting number or `null`.
 *
 */
export declare function parseFieldNumber(value: string | null | undefined): number | null;
/**
 * Evaluates a {@link FormCalcSpec} against the current field values. Blank or
 * unparseable operands are skipped (a `SUM` of no operands is `0`; the other
 * operations return `null` when there is nothing to combine, leaving the field
 * unchanged). Returns the computed value as a plain number string, or `null`.
 * @param spec - The spec value (FormCalcSpec).
 * @param values - The values to use.
 * @returns The resulting string or `null`.
 *
 */
export declare function evaluateCalc(spec: FormCalcSpec, values: ReadonlyMap<string, string>): string | null;
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