import { type EvaluatorHost, type EvaluatorRuntime } from "../evaluator.ts";
import { type ObserverDispatcher } from "../observer-dispatcher.ts";
import { type ResolvedPluginState } from "../plugin-merger.ts";
import type { SteeringConfig, SteeringDiagnostic } from "../schema.ts";
/**
 * Run `buildConfig` then `resolvePlugins` over the raw layer list,
 * short-circuiting before `resolvePlugins` if any merge-side
 * diagnostic is error-class. Avoids double-emitting
 * `tracker-name-collision` (O2 in INVARIANTS.md).
 * `validateUserConfigNames` runs unconditionally so user-config name
 * issues surface alongside merge errors.
 */
export declare function runMergerPipeline(layers: readonly SteeringConfig[], defaults: SteeringConfig | undefined, builtinTrackers: readonly string[]): {
    merged: SteeringConfig;
    resolved: ResolvedPluginState | null;
    diagnostics: SteeringDiagnostic[];
};
/**
 * Render a diagnostics array into a single multi-line message
 * suitable for use as a thrown Error's `message`. See {@link
 * SteeringDiagnostic} render-format matrix for the canonical shape;
 * the `formatAggregatedDiagnostics: rule-based spec` describe block in
 * `internal/session-runtime.test.ts` pins the rules.
 */
export declare function formatAggregatedDiagnostics(diagnostics: readonly SteeringDiagnostic[]): string;
/**
 * Single-line render of one diagnostic; see {@link SteeringDiagnostic}
 * render-format matrix for the canonical contract.
 */
export declare function formatSingleLineDiagnostic(d: SteeringDiagnostic): string;
/**
 * Build the per-session evaluator + observer dispatcher from the walk-
 * up config rooted at `cwd`. Honors `disableDefaults` via inner-wins
 * peek before injecting `DEFAULT_*`. Throws on any error-class
 * diagnostic and on warning-class diagnostics when
 * `failOnWarnings !== false`; otherwise emits surviving warnings via
 * `console.warn`. See {@link runMergerPipeline} for the merge contract
 * and `finalizePluginState` for observer-drop.
 */
export declare function buildSessionRuntime(cwd: string, host: EvaluatorHost): Promise<{
    evaluator: EvaluatorRuntime;
    dispatcher: ObserverDispatcher;
}>;
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