import type { GeolocationConfig, PresetConfig, ViewportConfig } from '../types';
export declare const BUILT_IN_PRESETS: Record<string, PresetConfig>;
/**
 * Load custom presets from a JSON file.
 * Custom presets override built-in presets with the same name.
 */
export declare function loadCustomPresets(filePath?: string): void;
/**
 * Get all available presets (built-in + custom, custom overrides built-in).
 */
export declare function getAllPresets(): Record<string, unknown>;
/**
 * Resolve a named preset to context options.
 */
export declare function resolvePreset(name?: string): unknown | null;
/**
 * Validate context options.
 */
export declare function validateContextOptions(opts: unknown): string | null;
export interface ResolvedContextOptions {
    locale?: string;
    timezoneId?: string;
    geolocation?: GeolocationConfig;
    viewport?: ViewportConfig;
}
/**
 * Resolve context options from request params.
 * Priority: individual fields override preset defaults.
 */
export declare function resolveContextOptions(params: unknown): ResolvedContextOptions | null;
/**
 * Generate a deterministic hash for context options.
 * Used as part of the session key to isolate different presets.
 */
export declare function contextHash(opts: ResolvedContextOptions | null): string;
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