import { Log } from "@spinajs/log-common";
import { ILogArchiveContext } from "./context.js";
/**
 * Retention policy for archived log files. Decides WHICH archives are deleted
 * after a rotation ( eg. keep newest N, drop older than maxAge ).
 *
 * Retention strategies are composable - a file target applies a LIST of them in
 * sequence, so count + age can be combined. Each concrete strategy is
 * `@NewInstance()` to keep per-target state isolated, mirroring the fs cleanup
 * strategies.
 */
export declare abstract class LogRetentionStrategy {
    protected Logger: Log;
    /**
     * Removes archives from `ctx.archiveDir` according to the strategy policy.
     *
     * @param ctx archive context of the file target
     */
    abstract prune(ctx: ILogArchiveContext): Promise<void>;
    /**
     * Single prune guarded against errors so one failing retention strategy never
     * aborts the rest of the retention list or the rotation routine.
     */
    safePrune(ctx: ILogArchiveContext): Promise<void>;
}
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