/**
 * Crypto adapter, runtime-neutral interface for PKCE and random-bytes
 * operations used by oauth-core.ts.
 *
 * This file uses the Web Crypto API (globalThis.crypto), which is available
 * in React Native (Hermes / JavaScriptCore), modern browsers, and Node >= 19.
 *
 * API:
 *   createSha256Hash(input: string): Promise<string> , returns base64url digest
 *   randomBytesBase64url(n: number): string          , returns n random bytes as base64url
 */
/**
 * Compute SHA-256 of `input` and return the result as a base64url string.
 * Uses Web Crypto API, safe in React Native, browser, and modern Node.
 */
export declare function createSha256Hash(input: string): Promise<string>;
/**
 * Generate `n` cryptographically random bytes and return as base64url.
 * Uses Web Crypto API, safe in React Native, browser, and modern Node.
 */
export declare function randomBytesBase64url(n: number): string;
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