import { VzFormat } from '@vizor-vr/shared';
import type { FeatureFlags } from '@vizor-vr/shared';
/**
 * Tier gating for playback formats. A free-tier viewer must not get the paid
 * stereo/180 formats, but per product decision we degrade gracefully rather than
 * hard-fail: a stereo format renders as its mono equivalent (one eye), and only
 * formats with no sensible fallback (a 180 half-sphere projection) are blocked.
 */
export type FormatGateDecision = {
    action: 'allow';
} | {
    action: 'downgrade';
    to: VzFormat;
} | {
    action: 'block';
    requires: 'stereoFormats' | 'formats180';
};
/**
 * Decide whether a format may play under the given license features, returning a
 * graceful downgrade where one exists.
 */
export declare function resolveFormatGate(format: VzFormat | string, features: FeatureFlags): FormatGateDecision;
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