import { PdfValue } from '../pdf/objects.js';
import { PdfFile } from './document.js';
/** §7.10 — m numbers in, n numbers out. */
export type PdfFunction = (inputs: ReadonlyArray<number>) => Array<number>;
/**
 * Read a `/Function` entry into something callable (§7.10).
 *
 * The entry may also be an ARRAY of functions, each giving one output, which is
 * what a `/DeviceN` with a per-colorant transform states; that comes back as
 * one function returning all of them in order.
 *
 * @param file  The owning file.
 * @param value The `/Function` (or `/TintTransform`) entry, unresolved.
 * @returns The function, or `undefined` for one this cannot run.
 */
export declare function readFunction(file: PdfFile, value: PdfValue | undefined): PdfFunction | undefined;