/**
 * Sequence and environment signal collectors. D42.
 *
 * SIG_UNUSUAL_SEQUENCE needs to know what this entity has done before, which is
 * per-entity state the host already holds, so this module takes the history as
 * an argument rather than storing it. SIG_ENVIRONMENT_MISMATCH reads coarse
 * client facts only, and records no fingerprint.
 */
export type SequenceObservation = {
    /** True when this transition has not been seen for this entity before. */
    readonly novel: boolean;
    readonly transition: string;
};
/**
 * SIG_UNUSUAL_SEQUENCE: a path no invariant forbids but this entity has not
 * taken before. Novel on a first visit, which is why the catalogue rates it
 * `notable` rather than `pronounced`: most first visits are legitimate.
 *
 * `knownTransitions` is the host's per-entity history, as `from>to` strings.
 */
export declare function checkSequence(from: string, to: string, knownTransitions: ReadonlySet<string>): SequenceObservation;
/**
 * Coarse client facts. Every field is optional: a host that cannot determine one
 * should omit it rather than guess, because a guessed value produces a mismatch
 * that says nothing about the client.
 *
 * Deliberately not a fingerprint. There is no canvas hash, no font enumeration,
 * no screen geometry: only the handful of facts whose *disagreement* is
 * meaningful.
 */
export type ClientFacts = {
    /** Declared platform family, e.g. 'mobile' | 'desktop'. */
    readonly platform?: 'mobile' | 'desktop' | 'unknown';
    /** Whether a touch input modality is reported as available. */
    readonly touchCapable?: boolean;
    /** Whether pointer events were actually observed during the interaction. */
    readonly pointerObserved?: boolean;
    /** Whether keyboard events were actually observed. */
    readonly keyboardObserved?: boolean;
};
export type EnvironmentObservation = {
    readonly mismatch: boolean;
    /** Which check disagreed, for the trace. Empty when nothing did. */
    readonly reasons: readonly string[];
};
/**
 * SIG_ENVIRONMENT_MISMATCH: coarse facts that disagree with each other.
 *
 * A mobile client that reports touch capability but never produces a pointer
 * event is the canonical case, the declared modality never appeared. Privacy
 * tooling and managed devices produce the same shape, which is why this is
 * `faint` and only matters in combination.
 */
export declare function checkEnvironment(facts: ClientFacts): EnvironmentObservation;
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