/**
 * TimeScale — business-day / session-aware X mapping for trading charts.
 * Stage 2.1–2.3
 */
export type TimeScaleCalendar = "continuous" | "business-day";
export type MarketSession = "24x7" | "NYSE";
export interface TimeScaleOptions {
    calendar?: TimeScaleCalendar;
    session?: MarketSession;
    /** IANA timezone (reserved for future session-hour filtering) */
    timezone?: string;
}
export interface BusinessDayMapping {
    /** X values for chart (consecutive indices on business days) */
    scaledX: Float64Array;
    /** Original timestamp per scaled index (for tooltips / ticks) */
    timeByIndex: Float64Array;
    /** Original index → scaled index (-1 if skipped) */
    sourceToScaled: Int32Array;
}
/** Weekend check (NYSE calendar MVP — UTC weekends). */
export declare function isBusinessDay(ts: number, _opts?: TimeScaleOptions): boolean;
/**
 * Map timestamp series to consecutive business-day indices (skips Sat/Sun bars).
 * NaN in scaledX marks non-business bars (hidden gap).
 */
export declare function mapToBusinessDayScale(times: Float32Array | Float64Array, opts?: TimeScaleOptions): BusinessDayMapping;
/** Resolve timestamp at a scaled business-day index (for axis ticks). */
export declare function timeAtBusinessIndex(mapping: BusinessDayMapping, index: number): number | undefined;
/** Visible span in ms using business-day mapping. */
export declare function businessDaySpanMs(mapping: BusinessDayMapping, xMin: number, xMax: number): number;