/**
 * Reporter registry — holds the {@link PlanReporter} instances contributed
 * by `--reporter-plugin` packages.
 *
 * Unlike the executor/grader/eval-provider registries, reporters are NOT
 * keyed by a unique name: a reporter is a behavioral sink, and registering
 * the same kind of reporter twice (e.g. two logging reporters pointed at
 * different streams) is legitimate. The registry is therefore an ordered,
 * append-only list with no conflict detection. Registration order is
 * preserved so plugins fan out in the order the user listed them on the
 * command line.
 */
import type { RegisterFn } from "../utils/plugin-loader.js";
import type { PlanReporter } from "./plan-reporter.js";
/** Required {@link PlanReporter} methods — the ones declared WITHOUT `?` on
 *  the interface. A reporter missing either is malformed: it would throw
 *  `r.onTrialResult is not a function` per-event deep inside the composite's
 *  fan-out. Validating up front turns that into a clear, immediate failure. */
export declare const REQUIRED_REPORTER_METHODS: readonly ["onTrialResult", "onRunComplete"];
/**
 * Assert `reporter` is a usable {@link PlanReporter}: a non-null object that
 * implements every {@link REQUIRED_REPORTER_METHODS} entry.
 *
 * This is the single, specifier-agnostic shape check shared by every
 * registration path. It is deliberately GENERIC (no plugin specifier in the
 * message) so it can guard programmatic callers as well as plugin discovery;
 * the plugin loader wraps the thrown error with the offending specifier so
 * plugin authors still get an attributable, actionable message.
 *
 * The explicit null/non-object guard matters: `null["onTrialResult"]` throws a
 * raw `TypeError: Cannot read properties of null` — `typeof` only shields
 * undeclared *variables*, never property access — so without this guard a
 * `register(null)` / `register(undefined)` (or a primitive) would surface a
 * confusing generic TypeError instead of this clear message.
 */
export declare function assertValidReporter(reporter: unknown): asserts reporter is PlanReporter;
/** Append-only collection of plugin-contributed reporters. */
export interface ReporterRegistry {
    /** Add a reporter to the run's fan-out. */
    register(reporter: PlanReporter): void;
    /** All registered reporters, in registration order. */
    getAll(): PlanReporter[];
}
/** Create an empty {@link ReporterRegistry}. */
export declare function createReporterRegistry(): ReporterRegistry;
/** Every reporter plugin package exports a `registerReporters(registry)` function. */
export interface ReporterPluginEntry {
    registerReporters: RegisterFn<ReporterRegistry>;
}
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