/**
 * Pure helper functions for CLI log filtering and formatting.
 * Extracted from cli.ts registerLogsCommand for testability.
 * @since v2.10.0
 */
export declare const LOG_LEVEL_ORDER: Record<string, number>;
export interface JsonlEntry {
    ts: string;
    level: string;
    cat?: string;
    msg: string;
    dur?: number;
    ctx?: Record<string, unknown>;
    err?: {
        name: string;
        message: string;
        stack?: string[];
    };
}
export interface LogFilterOptions {
    level?: string;
    grep?: string;
    limit?: number;
}
/**
 * Creates a regex or substring matcher with ReDoS protection.
 * Falls back to case-insensitive substring for long (>200 chars) or invalid patterns.
 */
export declare function createSafeMatcher(pattern: string): (s: string) => boolean;
/**
 * Filters plain text log lines by [LEVEL] tags and grep pattern, with limit.
 * Lines are expected in chronological order; limit takes the last N lines.
 */
export declare function filterPlainLogLines(lines: string[], options: LogFilterOptions): string[];
/**
 * Parses JSONL lines, dropping invalid JSON silently.
 */
export declare function parseJsonlEntries(lines: string[]): JsonlEntry[];
/**
 * Filters parsed JSONL entries by level threshold and grep across msg/cat/ctx.
 * Level threshold means e.g. "warn" includes warn + error.
 */
export declare function filterJsonlEntries(entries: JsonlEntry[], options: LogFilterOptions): JsonlEntry[];
/**
 * Returns structured data for terminal display (no chalk -- caller colors).
 */
export declare function formatJsonlEntry(entry: JsonlEntry): {
    time: string;
    level: string;
    cat: string;
    msg: string;
    dur: string;
    ctx: Array<{
        key: string;
        value: string;
    }>;
    err: {
        name: string;
        message: string;
    } | null;
};
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