/**
 * The FDA Food Code two-stage cooling rule. Cooked food must drop from
 * {@link FDA_STAGE1_START_F} to {@link FDA_STAGE1_END_F} within two hours, and
 * all the way to {@link FDA_STAGE2_END_F} within six hours total, both measured
 * from the moment the food first drops into the danger zone.
 */
export declare const FDA_STAGE1_START_F = 135;
export declare const FDA_STAGE1_END_F = 70;
export declare const FDA_STAGE2_END_F = 41;
/** A single cooling data point: a Fahrenheit reading at an elapsed minute mark. */
export interface CoolingSample {
    /** Temperature in Fahrenheit. */
    tempF: number;
    /** Minutes elapsed on a shared, non-decreasing timeline (>= 0). */
    minutes: number;
}
/** Options for {@link assessCooling}. */
export interface CoolingOptions {
    /** Stage one deadline in hours (135F to 70F). Default: 2. */
    stage1LimitHours?: number;
    /** Total deadline in hours (135F to 41F). Default: 6. */
    stage2LimitHours?: number;
}
/** Outcome for one stage of the cooling rule. */
export interface CoolingStageResult {
    /** Target temperature in Fahrenheit the food must reach for this stage. */
    targetF: number;
    /** Deadline in minutes, measured from danger-zone entry. */
    limitMinutes: number;
    /** Whether the target was reached within the supplied data. */
    reached: boolean;
    /** Minutes from entry to reaching the target, or null if not reached. */
    elapsedMinutes: number | null;
    /** Whether the target was reached at or before the deadline. */
    withinLimit: boolean;
    /**
     * Deadline minus elapsed minutes. Positive means time to spare, negative
     * means over the deadline. Null if the target was not reached.
     */
    marginMinutes: number | null;
}
/** Result of a two-stage cooling assessment. */
export interface CoolingAssessment {
    /** Whether any reading was at or below the danger-zone entry temperature. */
    entered: boolean;
    /** Minute mark of the entry reading, or null if the food never entered. */
    entryMinutes: number | null;
    /** Temperature at entry in Fahrenheit, or null if the food never entered. */
    entryTempF: number | null;
    /**
     * True when the first reading was already in the danger zone, so the real
     * entry time may be earlier than the data shows.
     */
    entryUncertain: boolean;
    /** Stage one: 135F down to 70F. */
    stage1: CoolingStageResult;
    /** Stage two: 135F down to 41F. */
    stage2: CoolingStageResult;
    /** True only when both stages were reached within their deadlines. */
    safe: boolean;
}
/**
 * Assess a cooling curve against the FDA two-stage rule.
 *
 * The clock starts at the first reading that has dropped to or below
 * {@link FDA_STAGE1_START_F} (the danger-zone entry). Stage one measures the
 * time to reach {@link FDA_STAGE1_END_F}; stage two measures the time to reach
 * {@link FDA_STAGE2_END_F}. Readings must be in chronological order (oldest
 * first) and use Fahrenheit.
 *
 * @throws RangeError when no samples are provided or a limit is not positive.
 */
export declare function assessCooling(samples: CoolingSample[], options?: CoolingOptions): CoolingAssessment;
//# sourceMappingURL=cooling.d.ts.map