/**
 * CLI blocking checkpoint mechanism.
 *
 * Prints the checkpoint id + artifact summary + an `a/r/e` prompt to stderr,
 * blocks on stdin via readline until valid input is received, and:
 *   - 'a' / 'approve' → { approved: true }
 *   - 'r' / 'reject'  → prompts for feedback, returns { approved: false, feedback }
 *   - 'e' / 'edit'    → opens $EDITOR with artifact text, reads back on save,
 *                        returns { edit: true, editDelta: { before, after } }
 *
 * Falls back to the noop mechanism (auto-approve) when stdin is not a TTY,
 * and writes a warning to stderr.
 *
 * Sprint 8 — colocated in mechanisms/ per Sprint 7 precedent.
 */
import type { Readable } from "node:stream";
import type { CheckpointArtifact, CheckpointId, CheckpointMechanism, CheckpointOutcome } from "../types.js";
export declare class CliCheckpointMechanism implements CheckpointMechanism {
    private readonly fallback;
    private readonly stdin;
    private readonly editor?;
    /**
     * @param fallback - Injected noop-like mechanism used when stdin is not a TTY.
     *                   Defaults to a fresh NoopCheckpointMechanism instance.
     *                   Injecting allows tests to spy on the fallback path.
     * @param stdin    - Readable stream to read user input from.
     *                   Defaults to process.stdin; inject a pre-stuffed Readable
     *                   for performance benchmarks / non-TTY unit tests.
     * @param editor   - Editor command override ($EDITOR env var is used when
     *                   this is not supplied; falls back to "nano").
     */
    constructor(fallback?: CheckpointMechanism, stdin?: Readable, editor?: string | undefined);
    request(checkpoint: CheckpointId, artifact: CheckpointArtifact): Promise<CheckpointOutcome>;
}
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