import type { TemperatureReading } from "./types.js";
/** Options for configuring stall detection sensitivity. */
export interface StallOptions {
    /** Maximum temperature variance (in degrees) to consider a stall. Default: 2. */
    thresholdDegrees?: number;
    /** Minimum duration (in minutes) of low variance to qualify as a stall. Default: 30. */
    durationMinutes?: number;
}
/** Result of stall detection analysis. */
export interface StallResult {
    /** Whether the readings indicate an active stall. */
    isStalling: boolean;
    /** ISO timestamp of when the stall began, or null if not stalling. */
    stallStart: string | null;
    /** Duration of the stall in minutes (0 if not stalling). */
    stallDuration: number;
    /** Average temperature during the stall window, or null if not stalling. */
    avgTemp: number | null;
}
/**
 * Analyze a series of temperature readings to detect a stall (plateau).
 *
 * A stall is identified when the temperature varies by less than
 * `thresholdDegrees` over a trailing window of at least `durationMinutes`.
 * Readings must be sorted chronologically (oldest first).
 */
export declare function detectStall(readings: TemperatureReading[], options?: StallOptions): StallResult;
/** Options for configuring rapid change detection sensitivity. */
export interface RapidChangeOptions {
    /** Rate threshold in degrees per 5 minutes. Default: 5. */
    rateThreshold?: number;
}
/** Result of rapid change detection analysis. */
export interface RapidChangeResult {
    /** Whether the recent rate of change exceeds the threshold. */
    isRapid: boolean;
    /** Direction of the rapid change, or null if not rapid. */
    direction: "rising" | "falling" | null;
    /** Current rate of change in degrees per 5 minutes. */
    rate: number;
}
/**
 * Analyze recent temperature readings to detect rapid changes.
 *
 * Computes the rate of change between the two most recent readings,
 * normalized to degrees per 5 minutes. If only one or zero readings
 * are provided, returns a zero-rate result.
 */
export declare function detectRapidChange(readings: TemperatureReading[], options?: RapidChangeOptions): RapidChangeResult;
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