import type { ExplainContext } from './types.js';
/**
 * Gather the impure facts {@link buildExplanation} needs: the active phase tier
 * (from `state.json`), the provider-key env vars, and host-install state. Pure
 * functions stay pure — this is the one place that touches the filesystem and
 * `process.env`. Best-effort throughout: any read failure degrades to a safe
 * default rather than throwing, so `config explain` never dies on a half-set-up
 * repo. `env` is injectable for testing.
 */
export declare function gatherExplainContext(root: string, env?: NodeJS.ProcessEnv): Promise<ExplainContext>;
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