export type FilterOperator = 'CONTAINS' | 'CONTAINS_CI' | 'ENDS_WITH' | 'ENDS_WITH_CI' | 'EQUALS' | 'EQUALS_CI' | 'NOT_CONTAINS' | 'NOT_CONTAINS_CI' | 'NOT_EQUALS' | 'NOT_EQUALS_CI' | 'REGEX' | 'STARTS_WITH' | 'STARTS_WITH_CI';
export interface FilterRule {
    field: string;
    operator: FilterOperator;
    value: string;
}
export interface FilterLogger {
    debug(...args: unknown[]): void;
    error(...args: unknown[]): void;
    warn(...args: unknown[]): void;
}
export declare class LogFilterService {
    private logger?;
    constructor(logger?: FilterLogger);
    /**
     * Check if a log record matches a single filter rule.
     */
    matchesFilter(log: Record<string, unknown>, rule: FilterRule): boolean;
    /**
     * Check if a log record matches all filter rules (AND logic).
     */
    matchesFilters(log: Record<string, unknown>, rules: FilterRule[]): boolean;
    /**
     * Parse a filter string into a FilterRule object.
     * Supports formats:
     *   - "field OPERATOR value"
     *   - "OPERATOR value" (defaults to message field)
     */
    parseFilter(filterStr: string): FilterRule;
}
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