/**
 * Runtime integrity checkpoint — browser-facing detectors.
 *
 * Every probe degrades gracefully: when the underlying API is missing or the
 * page can't answer (Firefox has no `permissions.query` for mic/camera, no
 * `screen.isExtended`; canvas/frame capture can be unavailable), it returns
 * the `unknown`/`ok`/`null` fallback rather than throwing or manufacturing a
 * false failure. The pure logic in `checkpoint.ts` treats those as "no drift".
 */
import type { DisplaySnapshot, FrameVerdict, PermissionSnapshot } from "./types.js";
/** Map a live camera/microphone permission to a tri-state snapshot. */
export declare function queryPermission(name: "microphone" | "camera"): Promise<PermissionSnapshot>;
/** Current device ids grouped by kind, or null when enumeration is unavailable. */
export declare function listDeviceIds(): Promise<Record<"audioinput" | "videoinput" | "audiooutput", Set<string>> | null>;
/** External-monitor detection via `screen.isExtended` (Chromium-only). */
export declare function probeDisplay(): DisplaySnapshot;
/**
 * Sample a live video track for black / frozen. Waits for decoded-frame
 * callbacks instead of treating visual stillness as a stalled camera: an
 * all-dark first frame is "black"; a second frame whose browser-owned
 * `presentedFrames` / `mediaTime` advances is "ok", even when every pixel is
 * identical; no advancing second frame within the bounded budget is "frozen".
 * Returns "unknown" when the browser can't report frame presentation, playback
 * can't start, the first frame never arrives, or canvas capture is unavailable.
 *
 * Browser integration still needs a real camera; unit tests cover the decoded-
 * frame progression, timeout, and black-frame branches with injected elements.
 */
export declare function sampleVideoFrame(track: MediaStreamTrack): Promise<FrameVerdict>;
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