/**
 * Reading a `<gen type="pattern">` drawing, whatever it was drawn in.
 *
 * The attributes name a shape three different ways — points typed inline, a
 * corridor between an upper and a lower line, or a file (SVG or PNG) that is
 * measured for its highest and lowest point at each position. This module turns
 * all three into the one `PatternGen` the engines sample, and remembers the
 * answer so a file is read once per render rather than once per row.
 */
import { type DataSourceOptions } from '../data-source/index.js';
import { type PatternGen } from '../generators/pattern.js';
import type { GenSpec } from './types.js';
/**
 * Resolve a pattern gen (cached per render). `upper` (± `lower`) → corridor;
 * otherwise `points`/`src` → a single-curve signal.
 */
export declare function patternGenForGen(gen: GenSpec, dataSources: DataSourceOptions): PatternGen;
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