import type { Contexts } from "./types";
/**
 * Base64 encode a string, works in both browser and Node.js environments.
 */
export declare const base64Encode: (str: string) => string;
/**
 * Deep equality check for Contexts objects.
 */
export declare const contextsEqual: (a: Contexts, b: Contexts) => boolean;
/**
 * Validate a Contexts object, logging warnings for invalid structures.
 */
export declare const validateContexts: (contexts: Contexts) => void;
/**
 * Encode a Contexts object for use in the eval-with-context URL path.
 *
 * For quonfig, we encode the context as:
 * 1. JSON.stringify the contexts object directly
 * 2. Base64 encode
 * 3. URL encode
 */
export declare const encodeContexts: (contexts: Contexts) => string;
/**
 * Encode contexts in the prefab-compatible wire format (used by eval-with-context endpoint).
 * This produces the typed format: { contexts: [{ type: "user", values: { email: { string: "foo" } } }] }
 */
export declare const encodeContextsTyped: (contexts: Contexts) => string;