import type { ScanUsageOptions, ExitResult } from '../config/types.js';
/**
 * Scans the codebase for environment variable usage and compares it with
 * the selected environment file (.env or .env.example).
 *
 * This function performs the following:
 *  - Scans the codebase for used environment variables
 *  - Strips out usages found in commented code
 *  - Detects missing variables, unused variables, duplicates, and secrets
 *  - Determines which file to compare against based on CLI flags and config
 *  - Optionally auto-fixes missing keys, duplicate keys, and .gitignore entries
 *  - Validates usage patterns for specific frameworks (Next.js, Vite, etc.)
 *  - Outputs results in JSON or console format
 *  - Returns a boolean indicating whether the process should exit with an error
 *
 * @param {ScanUsageOptions} opts - Scan configuration options
 * @returns {Promise<ExitResult>} Whether the caller should exit with a non-zero code.
 */
export declare function scanUsage(opts: ScanUsageOptions): Promise<ExitResult>;
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