export declare const BAUD_RATE = 115200;
export declare function resolvePort(explicit?: string): Promise<string>;
export declare function collectFiles(buildDir: string): Promise<{
    path: string;
    data: Buffer;
}[]>;
export interface EnvVar {
    key: string;
    value: string;
    secret: boolean;
}
export interface LoadEnvOptions {
    /** Directory to scan for .env files. */
    cwd: string;
    /** Mode name used to discover .env.<mode> (e.g. 'development', 'production', 'test'). */
    mode: string;
    /** Explicit --env-file FILE path (additive, layered after auto-discovery). */
    envFile?: string;
    /** When true, skips auto-discovery of .env / .env.<mode>. Explicit files still load. */
    noAutoEnv?: boolean;
}
/**
 * Load env vars from .env files with precedence (later overrides earlier):
 *   1. <cwd>/.env                  (auto, skipped when noAutoEnv)
 *   2. <cwd>/.env.<mode>           (auto, skipped when noAutoEnv)
 *   3. opts.envFile                (explicit --env-file, error if missing)
 *
 * Auto-discovered files are silently skipped if missing.
 * Returned array is deduped by key with last-wins semantics.
 *
 * Vars are marked secret by default. Add a `# @no-secret` comment line
 * directly above an entry to opt that one var out (visible in `mikro env list`).
 */
export declare function loadEnvFiles(opts: LoadEnvOptions): Promise<EnvVar[]>;
/** Maximum length of an env var name persisted to ESP32 NVS. */
export declare const NVS_KEY_MAX_LENGTH = 15;
/**
 * Validate that all env var keys fit within NVS's name length limit.
 * Throws with a single error listing every violation.
 */
export declare function validateNvsKeys(vars: EnvVar[]): void;
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