import { ILogEntry, ILogFilterOptions, LogFilter, LogLevel, StrToLogLevel } from "@spinajs/log-common";
type LevelName = keyof typeof StrToLogLevel;
/**
 * Options for {@link LevelFilter}.
 */
export interface ILevelFilterOptions extends ILogFilterOptions {
    /** Lowest level to keep ( inclusive ). Entries below are dropped. */
    min?: LevelName;
    /** Highest level to keep ( inclusive ). Entries above are dropped. */
    max?: LevelName;
}
/**
 * Level-window filter. Keeps an entry only when its numeric {@link LogLevel} is
 * within `[min, max]` ( both inclusive, both optional ), otherwise drops it.
 * Useful for routing eg. only warn..error to a given target via a filter.
 */
export declare class LevelFilter extends LogFilter {
    protected min: LogLevel;
    protected max: LogLevel;
    constructor(options?: ILevelFilterOptions);
    apply(entry: ILogEntry): ILogEntry | null;
}
export {};
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