import type { DataSourceOptions } from '../data-source/resolve.js';
import { type RepeatSpec } from './repeat.js';
import type { GenSpec } from './types.js';
/**
 * The ordered value list of a list-backed generator, for `order="sequential"`:
 * `text` splits its `value`, `file` loads its lines (or a CSV column) as-is.
 */
export declare function sequentialList(gen: GenSpec, dataSources: DataSourceOptions): string[];
/**
 * Which of `size` values row `index` gets: `index mod size` (loop), or an error
 * past the end when `cycle=false`.
 *
 * The one place that decides, so a text list, a file column and a walked date
 * range answer the same way — and say the same thing when they run out. A date
 * range never becomes a list (a century by the second is not a list anyone
 * should hold), which is why this takes a SIZE rather than the values.
 */
export declare function sequentialIndex(size: number, index: number, cycle: boolean): number;
/** Pick element `index mod N` (loop), or error past the end when `cycle=false`. */
export declare function pickSequential(list: readonly string[], index: number, cycle: boolean): string;
/**
 * The walk a fixed `repeat="N"` rides, or undefined when this is not that column.
 *
 * Both engines ask the same question here, so neither spells the condition out and
 * they cannot drift apart on which configs are walked.
 */
export declare function walkedRepeat(gen: GenSpec, spec: RepeatSpec | undefined, dataSources: DataSourceOptions): ((row: number) => string) | undefined;
/**
 * How a walked column answers ONE row — with a fixed `repeat=` or without.
 *
 * The streaming engine asks for exactly this and nothing else, so the choice
 * between the two shapes is made once, here, rather than at every row.
 */
export declare function walkedValueAt(gen: GenSpec, spec: RepeatSpec | undefined, dataSources: DataSourceOptions): (row: number) => string;
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