export type DueDateMethod = 'lmp' | 'conception' | 'ivf';
/** Embryo age at transfer, in days (cleavage vs blastocyst). */
export type EmbryoAge = 3 | 5;
export type Trimester = 'preconception' | 'first' | 'second' | 'third' | 'postterm';
/** Number of fetuses. Drives surveillance schedule and planned-birth timing. */
export type Plurality = 'singleton' | 'twin' | 'triplet';
/**
 * Placentation of a multiple pregnancy. `unknown` is the safe default — managed
 * as monochorionic (the higher-risk assumption) until proven otherwise, per
 * NICE QS46. Only meaningful when `plurality !== 'singleton'`.
 */
export type Chorionicity = 'dichorionic-diamniotic' | 'monochorionic-diamniotic' | 'monochorionic-monoamniotic' | 'unknown';
/** Naegele's rule: a term pregnancy is 280 days from the LMP. */
export declare const GESTATION_DAYS = 280;
/** Ovulation/conception sits ~14 days after the LMP in a 28-day cycle. */
export declare const CONCEPTION_OFFSET_DAYS = 14;
/** A term pregnancy is 266 days from conception. */
export declare const TERM_FROM_CONCEPTION_DAYS = 266;
/** Standard menstrual-cycle length Naegele assumes. */
export declare const DEFAULT_CYCLE_LENGTH = 28;
export interface DueDateInput {
    method: DueDateMethod;
    /** The reference date for the chosen method (LMP / conception / transfer). */
    date: Date;
    /** LMP only — average cycle length in days. Defaults to 28. */
    cycleLength?: number;
    /** IVF only — embryo age at transfer in days. Defaults to 5 (blastocyst). */
    embryoAge?: EmbryoAge;
}
export interface GestationalAge {
    weeks: number;
    days: number;
    totalDays: number;
}
export interface DueDateResult {
    /** Estimated date of delivery. */
    dueDate: Date;
    /** GA day-0 anchor (notional LMP) the trimester maths counts from. */
    gestationalStart: Date;
    /** Gestational age as of `today`; `null` before conception. */
    gestationalAge: GestationalAge | null;
    trimester: Trimester;
}
/** Classify gestational age (in completed weeks) into a trimester. */
export declare function trimesterForWeeks(totalDays: number): Trimester;
/**
 * Resolve the gestational start (notional LMP) and due date for a method.
 * `cycleLength` shifts a longer/shorter cycle's ovulation, moving the due
 * date while GA stays counted from the LMP — the standard convention.
 */
export declare function computeDueDate(input: DueDateInput, today: Date): DueDateResult;
/** Gestational weeks at which clinically notable milestones fall. */
export declare const MILESTONE_WEEKS: readonly [12, 24, 28, 37, 40];
export interface GestationalMilestone {
    /** Stable key (`w12`, `w24`, …) for i18n lookup. */
    key: string;
    /** Completed gestational weeks. */
    week: number;
    /** Calendar date the milestone is reached. */
    date: Date;
}
/**
 * Project the standard milestone dates from a gestational start (notional
 * LMP / GA day 0): end of first trimester (12w), viability (24w), third
 * trimester (28w), term (37w) and the 40-week due date.
 */
export declare function gestationalMilestones(gestationalStart: Date): GestationalMilestone[];
/** Badge `variant` names used for trimesters (the Badge component's union). */
export type TrimesterBadgeVariant = 'neutral' | 'info' | 'success' | 'warning' | 'error';
/** Trimester → on-screen Badge variant. */
export declare const TRIMESTER_BADGE_VARIANT: Record<Trimester, TrimesterBadgeVariant>;
/**
 * DS token NAME backing each trimester's result-card chip — the solid-fill
 * companion of `TRIMESTER_BADGE_VARIANT` (Badge `error` fills `--destructive`;
 * `neutral` fills `--muted`). Passed as the card's `highlightToken` so the
 * inserted PNG chip matches the on-screen trimester badge; `InsertButton`
 * resolves the name to a concrete colour at raster time.
 *
 * `third` resolves to `--warning-readable`, which the result card's colour
 * probe resolves in the live themed DOM: orange-600 in light, non-accessible
 * mode (where bare `--warning` yellow only reaches ~3.2:1 on the white card)
 * and `--warning` elsewhere, whose deepened ramp already clears contrast.
 * Resolving the token NAME at the card means the choice tracks the live theme
 * regardless of where the theme class lives.
 */
export declare const TRIMESTER_HIGHLIGHT_TOKEN: Record<Trimester, string>;
/** The DS token name for a trimester's result-card chip. */
export declare function trimesterHighlightToken(trimester: Trimester): string;
/** Which body's planned-birth timing to use for multiples. */
export type BirthGuideline = 'nice' | 'acog';
/** Planned-birth window as GA days (week*7 + day), inclusive, with source. */
export interface BirthWindow {
    startDay: number;
    endDay: number;
    source: string;
}
/**
 * Recommended planned-birth window for a multiple pregnancy, by chorionicity.
 * Singletons return `null` (use the 40-week EDD instead). `unknown`
 * chorionicity is managed as monochorionic-diamniotic — the higher-risk
 * default (NICE QS46).
 */
export declare function plannedBirthWindow(plurality: Plurality, chorionicity?: Chorionicity, guideline?: BirthGuideline): BirthWindow | null;
/** Robinson–Fleming dating is validated for CRL 45–84 mm. */
export declare const CRL_DATING_MIN_MM = 45;
export declare const CRL_DATING_MAX_MM = 84;
/** Gestational age in days from a crown-rump length (mm), Robinson–Fleming. */
export declare function crlToGestationalAgeDays(crlMm: number): number;
/**
 * ACOG CO 700 redating threshold (in days) for a given GA-by-LMP: re-date the
 * EDD to the ultrasound estimate only when the discrepancy EXCEEDS this.
 */
export declare function redatingThresholdDays(gaByLmpDays: number): number;
export interface CrlRedatingInput {
    /** Reported first day of the last menstrual period. */
    lmp: Date;
    /** Date the ultrasound CRL was measured. */
    scanDate: Date;
    /** Crown-rump length, mm. */
    crlMm: number;
}
export interface CrlRedatingResult {
    /** Notional LMP (GA day 0) after the rule — the ultrasound's or the original. */
    gestationalStart: Date;
    /** Whether the ultrasound estimate replaced the LMP dating. */
    redated: boolean;
    /** |GA-by-LMP − GA-by-CRL| at the scan, in days. */
    discrepancyDays: number;
    /** The ACOG CO 700 threshold (days) that applied. */
    thresholdDays: number;
    /** CRL − LMP dating, in days (+ = fetus ahead of dates). Server `eco_diff_days`. */
    ecoDiffDays: number;
    /** Whether the CRL is within the 45–84 mm dating-validity window. */
    crlInRange: boolean;
}
/** Apply the ACOG CO 700 CRL-redating rule to an LMP. */
export declare function redateByCrl(input: CrlRedatingInput): CrlRedatingResult;
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