/** Target unit for {@link formatSpeed}: km/h, mph, knots, or raw m/s. */
export type SpeedUnit = "kmh" | "mph" | "knots" | "ms";
/** Options for {@link formatSpeed}. */
export interface SpeedFormat {
    /** Target unit to convert into from the m/s input. Defaults to `"kmh"`. */
    unit?: SpeedUnit;
    /** Fractional digits to show. Defaults to 0. */
    decimals?: 0 | 1 | 2;
    /** Append the unit label. Defaults to true; set false to compose custom unit styling. */
    showUnit?: boolean;
}
/**
 * Format a speed given in meters/second as a HUD-ready string in km/h, mph, knots, or m/s — the one conversion table every speedometer and telemetry readout should share.
 *
 * @capability speed-format render a m/s speed as km/h, mph, knots, or m/s for speedometers and telemetry HUDs
 */
export declare function formatSpeed(metersPerSecond: number, options?: SpeedFormat): string;