/**
 * Machine-managed cache of USB serial → last-seen {chip, deviceId}, so the
 * picker and `ls` can show them while a board is disconnected. The device id is
 * cached mainly for USB-UART bridge boards, whose serial isn't the chip MAC and
 * so can't be derived offline. Rewritten on every connect, not hand-edited.
 * Firmware version is not cached — it goes stale on reflash.
 */
export interface CachedDevice {
    chip?: string;
    deviceId?: string;
}
export declare function deviceCacheFilePath(): string;
export declare function getCachedChip(serialNumber: string | undefined): string | undefined;
export declare function getCachedDeviceId(serialNumber: string | undefined): string | undefined;
/** Records connect-handshake facts for a port's serial. Never throws — a cache
 *  write must not disrupt a live session. */
export declare function rememberDeviceForPort(port: string | undefined, facts: CachedDevice): Promise<void>;
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