/**
 * Generates a SHA-1 hash of a given string or Buffer and returns it as a Base64-encoded string.
 *
 * Useful for checksum validation, content fingerprinting, or creating short deterministic identifiers.
 *
 * SHA-1 is considered **cryptographically weak** and should not be used for security-sensitive
 * operations (like password hashing or digital signatures). For those, prefer SHA-256.
 *
 * @param content - The input content (string or Buffer) to hash.
 * @returns The Base64-encoded SHA-1 hash string.
 *
 * @example
 * sha1('hello'); // returns 'qvTGHdzF6KLavt4PO0gs2a6pQ00='
 *
 * @example
 * sha1(Buffer.from('hello')); // also returns 'qvTGHdzF6KLavt4PO0gs2a6pQ00='
 */
export declare function sha1(content: string | Buffer): string;
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