/**
 * Default name for the primary environment file containing actual values.
 * This file should typically be git-ignored as it may contain secrets.
 * @example '.env'
 */
export declare const DEFAULT_ENV_FILE = ".env";
/**
 * Default name for the example/template environment file.
 * This file should be committed to version control to document required variables.
 * @example '.env.example'
 */
export declare const DEFAULT_EXAMPLE_FILE = ".env.example";
/**
 * Name of the git directory used to detect repository root.
 */
export declare const GIT_DIR = ".git";
/**
 * Name of the gitignore file used to check if env files are properly ignored.
 */
export declare const GITIGNORE_FILE = ".gitignore";
/**
 * Constant of possible issues detected with .gitignore regarding environment files.
 */
export declare const GITIGNORE_ISSUES: {
    readonly NO_GITIGNORE: "no-gitignore";
    readonly NOT_IGNORED: "not-ignored";
};
/**
 * Common environment file variants checked during auto-discovery.
 * Listed in priority order - earlier entries are preferred when multiple exist.
 *
 * @remarks
 * - `.env` - Primary environment file (should be git-ignored)
 * - `.env.example` - Template file (should be committed)
 * - `.env.local` - Local overrides (should be git-ignored)
 * - `.env.production` - Production-specific values (should be git-ignored)
 * - `.env.development` - Development-specific values (depends on workflow, so we don't warn)
 */
export declare const DEFAULT_ENV_CANDIDATES: readonly [".env", ".env.example", ".env.local", ".env.production", ".env.development", ".env.schema"];
/**
 * Patterns to check for in .gitignore when validating env file safety.
 * These files should always be git-ignored to prevent committing secrets.
 */
export declare const DEFAULT_GITIGNORE_ENV_PATTERNS: readonly [".env"];
/**
 * Allowed categories for filtering comparison results.
 * These categories can be used to focus on specific types of differences.
 */
export declare const ALLOWED_CATEGORIES: readonly ["missing", "extra", "empty", "duplicate", "gitignore"];
/**
 * Threshold in days for showing expiration warnings for environment variables.
 * Expiration warnings are shown for variables with expiration dates within this threshold.
 * Expiration warnings do not trigger an error exit by default, but can be promoted to errors with strict mode.
 */
export declare const EXPIRE_THRESHOLD_DAYS = 20;
/**
 * Threshold in days for urgent expiration checks.
 * Expiration warnings at or below this value trigger an error exit even without strict mode.
 */
export declare const URGENT_EXPIRE_DAYS = 7;
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