/**
 * Internal helpers shared across codec façades. Not part of the public API.
 */
import { type CompressionMode, type CompressOptions, type DecompressOptions } from './types.js';
/** Clamp a level into `[min, max]`, falling back to `def` when undefined. */
export declare function clampLevel(level: number | undefined, min: number, max: number, def: number): number;
/** Resolve the public policy option to its default. */
export declare function compressionMode(opts?: CompressOptions): CompressionMode;
/** Pick a level from mode defaults unless the caller supplied one explicitly. */
export declare function levelForMode(opts: CompressOptions | undefined, min: number, max: number, defaults: Record<CompressionMode, number>): number;
export declare function bunRuntime(): any | undefined;
/** Throw {@link AbortError} if the signal is already aborted. */
export declare function throwIfAborted(signal?: AbortSignal): void;
/**
 * Run a synchronous codec on the engine inside a Promise, honoring an
 * `AbortSignal` at entry and reporting trivial start/finish progress. The
 * engine itself is one-shot and cannot yield mid-call; for genuinely
 * off-thread work use \`@myrialabs/zipkit\`.
 */
export declare function runAsync(work: () => Uint8Array, opts: CompressOptions | DecompressOptions | undefined, inputLen: number): Promise<Uint8Array>;
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