import type { FlakinessRecord, ObservationRecord, RunReport } from './format.js';
/**
 * The subjects that disagreed with themselves, folded once for every reader.
 *
 * The pull-request comment, the report page and the MCP summary each say which
 * subjects were unstable, what moved between the two readings, and what the
 * history record knows about them. They differ in how they spell a line, never
 * in which subjects are listed or what is known about each, so that half lives
 * here and each surface only renders it.
 */
/**
 * The sentence for a subject no history store answered about.
 *
 * Absent is not "first time": silence would read as the one claim the record
 * exists to make or refuse, so every surface says this instead.
 */
export declare const NO_RECORD = "No history record: recurrence unknown";
/**
 * Whether two readings of this subject disagreed outside what it declared it
 * asserts on. Such a subject holds the run open and cannot be accepted; an
 * absorbed instability is neither.
 */
export declare function isUnstable<T extends {
    readonly unstable?: {
        readonly absorbed?: unknown;
    };
}>(observation: T): observation is T & {
    readonly unstable: NonNullable<T['unstable']>;
};
/**
 * One subject whose two readings disagreed outside what it asserts on: what moved
 * between them, and what the history store knows about it. A surface renders
 * these; it does not decide which subjects they are.
 */
export interface UnstableSubject {
    readonly subject: string;
    readonly components: NonNullable<ObservationRecord['unstable']>['components'];
    readonly bands: readonly string[];
    /** What the history store knows. Absent: none answered, see {@link NO_RECORD}. */
    readonly record?: FlakinessRecord;
}
/**
 * Every unabsorbed instability in report order, and whether no subject among
 * them has a record — which is every subject of a run with no history
 * configured, and is said once rather than per subject.
 */
export declare function unstableOf(report: Pick<RunReport, 'observations' | 'flakiness'>): {
    readonly subjects: readonly UnstableSubject[];
    readonly unrecorded: boolean;
};
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