/**
 * One Pi session line reduced to what settings restoration reads. Message
 * content is dropped here, line by line, so conversation text never reaches
 * the settings snapshot or stays in memory.
 */
export type PiSettingsLine = {
    readonly kind: "header";
    readonly cwd: string;
    readonly sessionId: string;
    readonly version: number;
} | {
    readonly kind: "entry";
    readonly id: string | null;
    readonly parentId: string | null;
    readonly model?: {
        readonly provider: string;
        readonly model: string;
    };
    readonly effort?: string;
};
/** Null is a line hcn cannot trust; the whole read is then unavailable. */
export declare function parsePiSettingsLine(value: unknown): PiSettingsLine | null;
export interface PiSessionSettings {
    readonly cwd: string;
    readonly effort: string;
    /** The entries that set the values, for the fingerprint. */
    readonly effortEntry: string | null;
    readonly model: string;
    readonly modelEntry: string;
    readonly provider: string;
    readonly sessionId: string;
}
/**
 * Pi's own restoration rule (Pi 0.87.1, `dist/core/session-manager.js`).
 * `_buildIndex` makes the last non-header entry the leaf; `buildSessionPath`
 * walks `parentId` links from it and stops at a missing parent;
 * `getSessionContextSettings` lets each `model_change` and assistant message
 * replace the model, and each `thinking_level_change` replace the thinking
 * level, which starts at `off`. A version 1 file has no ids: Pi's migration
 * chains its entries in file order.
 */
export declare function piSessionSettings(lines: readonly PiSettingsLine[]): PiSessionSettings | "session-unavailable" | "settings-unavailable";
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