/**
 * Pure helpers for building `adb logcat` argv and post-filtering its output.
 * Extracted from client.ts (D9.10). Validators are invoked here so the client
 * can stay free of input-format concerns.
 */
export interface LogcatOptions {
    tag?: string;
    level?: "V" | "D" | "I" | "W" | "E" | "F";
    lines?: number;
    since?: string;
    package?: string;
}
/**
 * Build the argv for `adb shell logcat -d ...` from typed options.
 * Validates `tag` and `since` to keep argv safe.
 */
export declare function buildLogcatArgs(options: LogcatOptions): string[];
/**
 * Node-side filter for logcat output: keep only lines mentioning a package,
 * preserving timestamp lines so the output remains contextual.
 */
export declare function filterLogsByPackage(output: string, packageName: string): string;
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