/**
 * Generates a SHA-256 hash of a given string or Buffer and returns it as a Base64-encoded string.
 *
 * Useful for generating secure checksums, file fingerprints, or deterministic cache keys.
 *
 * SHA-256 is cryptographically strong and preferred for integrity and security checks.
 *
 * @param content - The input content (string or Buffer) to hash.
 * @returns The Base64-encoded SHA-256 hash string.
 *
 * @example
 * sha('hello'); // returns 'LPJNul+wow4m6DsqxbninhsWHlwfp0JecwQzYpOLmCQ='
 *
 * @example
 * sha(Buffer.from('hello')); // also returns the same value
 */
export declare function sha(content: string | Buffer): string;
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