/**
 * App-level lifecycle: `initLogger` on layer construction, `drain.flush()`
 * when the layer's scope closes (process shutdown for `Layer.launch` /
 * `runMain`-style programs).
 */
import { Effect } from "effect";
import * as Layer from "effect/Layer";
import type { LoggerConfig } from "evlog";
/** Anything with an async `flush` — matches evlog's `PipelineDrainFn`. */
export interface Flushable {
    readonly flush: () => Promise<void>;
}
/** Flush a drain pipeline, swallowing flush errors (shutdown path). */
export declare const flush: (drain: Flushable) => Effect.Effect<void>;
/**
 * Initialize evlog globally and, if the configured drain exposes `flush`
 * (evlog's `createDrainPipeline` does), flush buffered events when the
 * layer's scope closes.
 *
 * ```ts
 * import type { DrainContext } from "evlog"
 * import { createAxiomDrain } from "evlog/axiom"
 * import { createDrainPipeline } from "evlog/pipeline"
 *
 * const drain = createDrainPipeline<DrainContext>({ batch: { size: 50 } })(
 *   createAxiomDrain()
 * )
 *
 * const EvlogLive = EvlogInit.layer({
 *   env: { service: "checkout", environment: "production" },
 *   drain
 * })
 * ```
 */
export declare const layer: (config?: LoggerConfig) => Layer.Layer<never>;
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