/**
 * Generates TypeScript interfaces and helper types/functions for representing
 * collection data at varying levels of "depth" (relation expansion) for Payload CMS.
 *
 * This function analyzes the provided program (typically a payload-types.ts),
 * collects all relevant interfaces, and emits:
 * - Depth union type (e.g., `export type Depth = 0 | 1 | 2`)
 * - Per-collection depth interfaces (e.g., `Post_D0`, `Post_D1`, ...)
 * - DepthQuery type for mapping collection slugs and depth levels to the correct interface
 * - Runtime helpers for extracting IDs and pruning undefined values
 * - Mapper functions for projecting data from higher to lower depth
 * - Dispatcher for projecting any collection's data between depth levels
 *
 * @param program - The TypeScript program or AST containing collection interfaces.
 * @param maxDepth - The maximum depth level to generate interfaces for (default: 2).
 * @param opts - Optional configuration:
 * @param opts.onlyNames - Restrict generation to specific interface names.
 * @returns A string containing all generated TypeScript code.
 * @throws If no collections are found in the program's Config interface.
 */
export declare const generateDepthInterfaces: (program: unknown, maxDepth?: number, opts?: {
    onlyNames?: string[];
}) => string;
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