import { BufferSource } from 'node:stream/web';
/**
 * Returns the SHA-256 hash of the given message, encoded as a base64 string.
 * @param message The message to hash, that could be a string or a binary. If a string is given, it will be encoded as UTF-8.
 * @returns The SHA-256 hash of the given message, encoded as a base64 string.
 */
export declare function sha256Base64(message: string | BufferSource): Promise<string>;
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