import type { LevelFilter, LogSink, LogSinkCounters, MutableLogSinkCounters } from './types.js';
export declare function installProcessSink(sink: LogSink, level: LevelFilter, opts?: {
    readonly replace?: boolean;
}): void;
/** The installed destination, or `undefined` when nobody claimed the process. */
export declare function getProcessSink(): {
    readonly sink: LogSink;
    readonly level: LevelFilter;
    readonly counters: LogSinkCounters;
} | undefined;
/**
 * The mutable counter set the installed destination writes through.
 *
 * Internal in spirit, exported in fact: a mere reader wants
 * {@link getProcessSink}'s readonly view. A HOST needs this one, because it
 * is what makes the totals describe the process rather than one logger — it
 * hands the same object to every logger it builds, so `getLogCounters()` and
 * `namzu doctor`'s `logging.pipeline` check see one set of numbers. A global
 * accessor used to do that on the host's behalf; with it gone, the host does
 * it, which is why this is reachable from `@namzu/sdk` at all.
 */
export declare function getProcessSinkCounters(): MutableLogSinkCounters | undefined;
/**
 * Test-only: forget the installed sink.
 *
 * Production must never call this — the refusal above is the whole contract,
 * and a reset that production could reach would let a second caller take the
 * destination by clearing the first one rather than by saying `replace`.
 */
export declare function __resetProcessSinkForTests(): void;
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