export type LineChartTone = "category1" | "category2" | "category3" | "category4" | "category5" | "category6" | "category7" | "category8";
export type LineChartDatum = {
    x: number | string;
    y: number;
    /**
     * Marks the datum as a FORECAST point. Forecast points render with the
     * dedicated forecast tone and every segment touching a forecast point is
     * dashed — including the segment between the last actual point and the
     * first forecast point, so the line stays connected. Absent/false ⇒
     * rendering unchanged (additive).
     */
    forecast?: boolean;
};
/**
 * Semantic tone for an analytical overlay (reference line / band / goal).
 * Maps to the feedback token family — markers, not categorical series.
 */
export type ChartOverlayTone = "neutral" | "success" | "warning" | "error" | "info";
export type ChartReferenceLine = {
    value: number;
    label?: string;
    tone?: ChartOverlayTone;
    axis?: "x" | "y";
};
export type ChartBand = {
    from: number;
    to: number;
    label?: string;
    tone?: ChartOverlayTone;
};
export type ChartGoalLine = {
    value: number;
    label?: string;
};
/** Value-axis scale type. `log` requires strictly positive values. */
export type ChartScale = "linear" | "log";
import { type ChartAnnotation } from "./chartAnnotations.js";
import { type DataLabelsProp } from "./chartDataLabels.js";
type LineChartProps = {
    data: LineChartDatum[];
    width?: number;
    height?: number;
    tone?: LineChartTone;
    smooth?: boolean;
    area?: boolean;
    label: string;
    /** Reference lines (default `axis: "y"` → horizontal at `value`). */
    referenceLines?: ChartReferenceLine[];
    /** Shaded value-axis bands between `from`..`to`. */
    bands?: ChartBand[];
    /** A single goal line, emphasised above the data. */
    goalLine?: ChartGoalLine;
    /** Least-squares trend line over the data points. */
    trend?: boolean;
    /**
     * Annotation overlay in DATA space (points, labels, axis lines, regions,
     * polygons). Resolved to pixels via the chart's scales and drawn in a
     * dedicated `<g class="st-lineChart__annotations">` — regions behind the
     * series, every other kind above it. Additive: absent ⇒ unchanged.
     */
    annotations?: ChartAnnotation[];
    /**
     * Per-point value labels. `false`/absent (default) → none. `true` → each
     * point's value with the chart's numeric formatter. Object → `format(value)`
     * and/or a `position` override. Default position is `top` (above the point).
     * Labels are `aria-hidden` — the values already live in the accessible
     * ChartDataList.
     */
    dataLabels?: DataLabelsProp;
    /**
     * Fixed value-axis (y) domain `[min, max]`. When provided (and finite,
     * min<max) the y scale uses it instead of the data-derived range — letting
     * several LineCharts share one scale. Invalid/absent → auto range (unchanged).
     */
    domain?: [number, number];
    /**
     * Value-axis scale. `"linear"` (default) is unchanged. `"log"` switches the
     * y axis to base-10 logarithmic — values `<= 0` are ignored for domain/ticks
     * and clamped to the lowest tick when positioned.
     */
    scale?: ChartScale;
    /** Inverts the value (y) axis. Default false. */
    invertAxis?: boolean;
    /**
     * Toggles the legend if the chart has one. LineChart is single-series and has
     * no legend surface, so this prop is accepted for parity and otherwise ignored.
     */
    showLegend?: boolean;
    /**
     * CONTROLLED synchronised hover key (FR-3). A datum's key is `String(x)`. When
     * provided (string or null), the crosshair + tooltip track this key instead of
     * the chart's internal pointer hover (null ⇒ nothing shown), letting a parent
     * share one hover channel across several aligned charts. Absent (`undefined`)
     * keeps the legacy uncontrolled behaviour.
     */
    hoverKey?: string | null;
    /**
     * Emitted when the user hovers a datum (its key) or leaves the plot (`null`).
     * Always fired on pointer move/leave — even while CONTROLLED — so dataviz can
     * keep the shared hover channel in sync.
     */
    onHoverKeyChange?: (key: string | null) => void;
    /**
     * FR-5 — keyboard navigation of the data points (roving tabindex). When `true`
     * (or implied by wiring `onSelectKey`), a thin focusable overlay is rendered
     * over the points: the chart owns ONE tab stop, ←/↑/→/↓ move the focus between
     * points (data order), Home/End jump to the first/last, Enter/Space select the
     * focused point (`onSelectKey`), Escape leaves the navigation. Each focused
     * point announces its `x` + value. Absent ⇒ no overlay, rendering unchanged.
     */
    keyboardNav?: boolean;
    /**
     * Emitted when the user selects the focused point via Enter/Space (its key,
     * `String(x)`), or `null` when the navigation is left via Escape. Wiring it
     * also turns the keyboard navigation on.
     */
    onSelectKey?: (key: string | null) => void;
    class?: string;
};
declare const LineChart: import("svelte").Component<LineChartProps, {}, "">;
type LineChart = ReturnType<typeof LineChart>;
export default LineChart;
//# sourceMappingURL=LineChart.svelte.d.ts.map