@types/markerclustererplus/index.d.ts

// Type definitions for MarkerClustererPlus for Google Maps V3 2.1
// Project: https://github.com/mahnunchik/markerclustererplus
// Definitions by: Mathias Rodriguez <https://github.com/enanox>
//                 Michael Ledin <https://github.com/mxl>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 2.2

/// <reference types="google-maps" />

/**
 * This class represents the object for values in the <code>styles</code> array passed
 * to the {@link MarkerClusterer} constructor. The element in this array that is used to
 * style the cluster icon is determined by calling the <code>calculator</code> function.
 */
interface ClusterIconStyle {
    /** The URL of the cluster icon image file. Required. */
    url: string;
    /** Height The display height (in pixels) of the cluster icon. Required. */
    height: number;
    /** Width The display width (in pixels) of the cluster icon. Required. */
    width: number;
    /**
     * [anchorText] The position (in pixels) from the center of the cluster icon to
     * where the text label is to be centered and drawn. The format is <code>[yoffset, xoffset]</code>
     * where <code>yoffset</code> increases as you go down from center and <code>xoffset</code>
     * increases to the right of center. The default is <code>[0, 0]</code>.
     */
    anchorText?: number[];
    /**
     * [anchorIcon] The anchor position (in pixels) of the cluster icon. This is the
     * spot on the cluster icon that is to be aligned with the cluster position. The format is
     * <code>[yoffset, xoffset]</code> where <code>yoffset</code> increases as you go down and
     * <code>xoffset</code> increases to the right of the top-left corner of the icon. The default
     * anchor position is the center of the cluster icon.
     */
    anchorIcon?: number[];
    /** [textColor="black"] The color of the label text shown on the cluster icon. */
    textColor?: string;
    /** textSize=11] The size (in pixels) of the label text shown on the cluster icon. */
    textSize?: number;
    /**
     * [textDecoration="none"] The value of the CSS <code>text-decoration</code>
     * property for the label text shown on the cluster icon.
     */
    textDecoration?: string;
    /**
     * [fontWeight="bold"] The value of the CSS <code>font-weight</code>
     * property for the label text shown on the cluster icon.
     */
    fontWeight?: string;
    /**
     * [fontStyle="normal"] The value of the CSS <code>font-style</code>
     *  property for the label text shown on the cluster icon.
     */
    fontStyle?: string;
    /**
     * [fontFamily="Arial,sans-serif"] The value of the CSS <code>font-family</code>
     *  property for the label text shown on the cluster icon.
     */
    fontFamily?: string;
    /**
     * [backgroundPosition="0 0"] The position of the cluster icon image
     * within the image defined by <code>url</code>. The format is <code>"xpos ypos"</code>
     * (the same format as for the CSS <code>background-position</code> property). You must set
     * this property appropriately when the image defined by <code>url</code> represents a sprite
     * containing multiple images. Note that the position <i>must</i> be specified in px units.
     */
    backgroundPosition?: string;
}

/**
 *      the object that a <code>calculator</code> function returns.
 *
 *      array to be used to style the cluster icon.
 *      If this value is <code>undefined</code> or <code>""</code>, <code>title</code> is set to the
 *      value of the <code>title</code> property passed to the MarkerClusterer.
 */
interface ClusterIconInfo {
    text: string;
    index: number;
    title: string;
}

declare class ClusterIcon extends google.maps.OverlayView {
    /**
     * A cluster icon.
     *
     * @param cluster The cluster with which the icon is to be associated.
     * @param [styles] An array of {@link ClusterIconStyle} defining the cluster icons
     *       to use for various cluster sizes.
     */
    constructor(cluster: Cluster, styles: ClusterIconStyle[]);

    /**
     * Adds the icon to the DOM.
     */
    onAdd(): void;

    /**
     * Removes the icon from the DOM.
     */
    onRemove(): void;

    /**
     * Draws the icon.
     */
    draw(): void;

    /**
     * Hides the icon.
     */
    hide(): void;

    /**
     * Positions and shows the icon.
     */
    show(): void;

    /**
     * Sets the icon styles to the appropriate element in the styles array.
     *
     * @param style The icon label text and styles index.
     */
    useStyle(style: ClusterIconInfo): void;

    /**
     * Sets the position at which to center the icon.
     *
     * @param center The latlng to set as the center.
     */
    setCenter(center: google.maps.LatLng): void;

    /**
     * Creates the cssText style parameter based on the position of the icon.
     *
     * @param pos The position of the icon.
     * @return The CSS style text.
     */
    createCss(pos: google.maps.Point): string;

    /**
     * Returns the position at which to place the DIV depending on the latlng.
     *
     * @param latLng The position in latlng.
     * @return The position in pixels.
     */
    getPosFromLatLng_(latLng: google.maps.LatLng): google.maps.Point;
}

declare class Cluster {
    /**
     * Creates a single cluster that manages a group of proximate markers.
     * Used internally, do not call this constructor directly.
     * @param mc The <code>MarkerClusterer</code> object with which this
     *       cluster is associated.
     */
    constructor(mc: MarkerClusterer);

    /**
     * Returns the number of markers managed by the cluster. You can call this from
     * a <code>click</code>, <code>mouseover</code>, or <code>mouseout</code> event handler
     * for the <code>MarkerClusterer</code> object.
     *
     * @return The number of markers in the cluster.
     */
    getSize(): number;

    /**
     * Returns the array of markers managed by the cluster. You can call this from
     * a <code>click</code>, <code>mouseover</code>, or <code>mouseout</code> event handler
     * for the <code>MarkerClusterer</code> object.
     *
     * @return The array of markers in the cluster.
     */
    getMarkers(): google.maps.Marker[];

    /**
     * Returns the center of the cluster. You can call this from
     * a <code>click</code>, <code>mouseover</code>, or <code>mouseout</code> event handler
     * for the <code>MarkerClusterer</code> object.
     *
     * @return The center of the cluster.
     */
    getCenter(): google.maps.LatLng;

    /**
     * Returns the map with which the cluster is associated.
     *
     * @return The map.
     * @ignore
     */
    getMap(): google.maps.Map;

    /**
     * Returns the <code>MarkerClusterer</code> object with which the cluster is associated.
     *
     * @return The associated marker clusterer.
     * @ignore
     */
    getMarkerClusterer(): MarkerClusterer;

    /**
     * Returns the bounds of the cluster.
     *
     * @return the cluster bounds.
     * @ignore
     */
    getBounds(): google.maps.LatLngBounds;

    /**
     * Removes the cluster from the map.
     *
     * @ignore
     */
    remove(): void;

    /**
     * Adds a marker to the cluster.
     *
     * @param marker The marker to be added.
     * @return True if the marker was added.
     * @ignore
     */
    addMarker(marker: google.maps.Marker): boolean;

    /**
     * Determines if a marker lies within the cluster's bounds.
     *
     * @param marker The marker to check.
     * @return True if the marker lies in the bounds.
     * @ignore
     */
    isMarkerInClusterBounds(marker: google.maps.Marker): boolean;

    /**
     * Calculates the extended bounds of the cluster with the grid.
     */
    calculateBounds_(): void;

    /**
     * Updates the cluster icon.
     */
    updateIcon_(): void;

    /**
     * Determines if a marker has already been added to the cluster.
     *
     * @param marker The marker to check.
     * @return True if the marker has already been added.
     */
    isMarkerAlreadyAdded_(marker: google.maps.Marker): boolean;
}

type Calculator = (markers: google.maps.Marker[], clusterIconStylesCount: number) => ClusterIconInfo;

/**
 * Optional parameter passed to the {@link MarkerClusterer} constructor.
 */
interface MarkerClustererOptions {
    /** [gridSize=60] The grid size of a cluster in pixels. The grid is a square. */
    gridSize?: number;
    /**
     * [maxZoom=null] The maximum zoom level at which clustering is enabled or
     * <code>null</code> if clustering is to be enabled at all zoom levels.
     */
    maxZoom?: number;
    /**
     * [zoomOnClick=true] Whether to zoom the map when a cluster marker is
     * clicked. You may want to set this to <code>false</code> if you have installed a handler
     * for the <code>click</code> event and it deals with zooming on its own.
     */
    zoomOnClick?: boolean;
    /**
     * [averageCenter=false] Whether the position of a cluster marker should be
     * the average position of all markers in the cluster. If set to <code>false</code>, the
     * cluster marker is positioned at the location of the first marker added to the cluster.
     */
    averageCenter?: boolean;
    /**
     * [minimumClusterSize=2] The minimum number of markers needed in a cluster
     * before the markers are hidden and a cluster marker appears.
     */
    minimumClusterSize?: number;
    /**
     * [ignoreHidden=false] Whether to ignore hidden markers in clusters. You
     * may want to set this to <code>true</code> to ensure that hidden markers are not included
     * in the marker count that appears on a cluster marker (this count is the value of the
     * <code>text</code> property of the result returned by the default <code>calculator</code>).
     * If set to <code>true</code> and you change the visibility of a marker being clustered, be
     * sure to also call <code>MarkerClusterer.repaint()</code>.
     */
    ignoreHidden?: boolean;
    /**
     * [title=""] The tooltip to display when the mouse moves over a cluster
     * marker. (Alternatively, you can use a custom <code>calculator</code> function to specify a
     * different tooltip for each cluster marker.)
     */
    title?: string;
    /**
     * [calculator=MarkerClusterer.CALCULATOR] The function used to determine
     * the text to be displayed on a cluster marker and the index indicating which style to use
     * for the cluster marker. The input parameters for the function are (1) the array of markers
     * represented by a cluster marker and (2) the number of cluster icon styles. It returns a
     * {@link ClusterIconInfo} object. The default <code>calculator</code> returns a
     * <code>text</code> property which is the number of markers in the cluster and an
     * <code>index</code> property which is one higher than the lowest integer such that
     * <code>10^i</code> exceeds the number of markers in the cluster, or the size of the styles
     * array, whichever is less. The <code>styles</code> array element used has an index of
     * <code>index</code> minus 1. For example, the default <code>calculator</code> returns a
     * <code>text</code> value of <code>"125"</code> and an <code>index</code> of <code>3</code>
     * for a cluster icon representing 125 markers so the element used in the <code>styles</code>
     * array is <code>2</code>. A <code>calculator</code> may also return a <code>title</code>
     * property that contains the text of the tooltip to be used for the cluster marker. If
     * <code>title</code> is not defined, the tooltip is set to the value of the <code>title</code>
     * property for the MarkerClusterer.
     */
    calculator?: Calculator;
    /**
     * [clusterClass="cluster"] The name of the CSS class defining general styles
     * for the cluster markers. Use this class to define CSS styles that are not set up by the code
     * that processes the <code>styles</code> array.
     */
    clusterClass?: string;
    /**
     * [styles] An array of {@link ClusterIconStyle} elements defining the styles
     * of the cluster markers to be used. The element to be used to style a given cluster marker
     * is determined by the function defined by the <code>calculator</code> property.
     * The default is an array of {@link ClusterIconStyle} elements whose properties are derived
     * from the values for <code>imagePath</code>, <code>imageExtension</code>, and
     * <code>imageSizes</code>.
     */
    styles?: ClusterIconStyle[];
    /**
     * [enableRetinaIcons=false] Whether to allow the use of cluster icons that
     * have sizes that are some multiple (typically double) of their actual display size. Icons such
     * as these look better when viewed on high-resolution monitors such as Apple's Retina displays.
     * Note: if this property is <code>true</code>, sprites cannot be used as cluster icons.
     */
    enableRetinaIcons?: boolean;
    /**
     * [batchSize=MarkerClusterer.BATCH_SIZE] Set this property to the
     * number of markers to be processed in a single batch when using a browser other than
     * Internet Explorer (for Internet Explorer, use the batchSizeIE property instead).
     */
    batchSize?: number;
    /**
     * [batchSizeIE=MarkerClusterer.BATCH_SIZE_IE] When Internet Explorer is
     * being used, markers are processed in several batches with a small delay inserted between
     * each batch in an attempt to avoid Javascript timeout errors. Set this property to the
     * number of markers to be processed in a single batch; select as high a number as you can
     * without causing a timeout error in the browser. This number might need to be as low as 100
     * if 15,000 markers are being managed, for example.
     */
    batchSizeIE?: number;
    /**
     * [imagePath=MarkerClusterer.IMAGE_PATH]
     * The full URL of the root name of the group of image files to use for cluster icons.
     * The complete file name is of the form <code>imagePath</code>n.<code>imageExtension</code>
     * where n is the image file number (1, 2, etc.).
     */
    imagePath?: string;
    /**
     * [imageExtension=MarkerClusterer.IMAGE_EXTENSION]
     * The extension name for the cluster icon image files (e.g., <code>"png"</code> or
     * <code>"jpg"</code>).
     */
    imageExtension?: string;
    /**
     * [imageSizes=MarkerClusterer.IMAGE_SIZES]
     * An array of numbers containing the widths of the group of
     * <code>imagePath</code>n.<code>imageExtension</code> image files.
     * (The images are assumed to be square.)
     */
    imageSizes?: number[];
}

declare class MarkerClusterer extends google.maps.OverlayView {
    /**
     * Creates a MarkerClusterer object with the options specified in {@link MarkerClustererOptions}.
     * @param map The Google map to attach to.
     * @param [markers] The markers to be added to the cluster.
     * @param [options] The optional parameters.
     */
    constructor(map: google.maps.Map, markers?: google.maps.Marker[], options?: MarkerClustererOptions);

    /**
     * Implementation of the onAdd interface method.
     * @ignore
     */
    onAdd(): void;

    /**
     * Implementation of the onRemove interface method.
     * Removes map event listeners and all cluster icons from the DOM.
     * All managed markers are also put back on the map.
     * @ignore
     */
    onRemove(): void;

    /**
     * Implementation of the draw interface method.
     * @ignore
     */
    draw(): void;

    /**
     * Sets up the styles object.
     */
    setupStyles_(): void;

    /**
     *  Fits the map to the bounds of the markers managed by the clusterer.
     */
    fitMapToMarkers(): void;

    /**
     * Returns the value of the <code>gridSize</code> property.
     *
     * @return The grid size.
     */
    getGridSize(): number;

    /**
     * Sets the value of the <code>gridSize</code> property.
     *
     * @param gridSize The grid size.
     */
    setGridSize(gridSize: number): void;

    /**
     * Returns the value of the <code>minimumClusterSize</code> property.
     *
     * @return The minimum cluster size.
     */
    getMinimumClusterSize(): number;

    /**
     * Sets the value of the <code>minimumClusterSize</code> property.
     *
     * @param minimumClusterSize The minimum cluster size.
     */
    setMinimumClusterSize(minimumClusterSize: number): void;

    /**
     *  Returns the value of the <code>maxZoom</code> property.
     *
     *  @return The maximum zoom level.
     */
    getMaxZoom(): number;

    /**
     *  Sets the value of the <code>maxZoom</code> property.
     *
     *  @param maxZoom The maximum zoom level.
     */
    setMaxZoom(maxZoom: number): void;

    /**
     *  Returns the value of the <code>styles</code> property.
     *
     *  @return The array of styles defining the cluster markers to be used.
     */
    getStyles(): ClusterIconStyle[];

    /**
     *  Sets the value of the <code>styles</code> property.
     *
     *  @param styles The array of styles to use.
     */
    setStyles(styles: ClusterIconStyle[]): void;

    /**
     * Returns the value of the <code>title</code> property.
     *
     * @return The content of the title text.
     */
    getTitle(): string;

    /**
     *  Sets the value of the <code>title</code> property.
     *
     *  @param title The value of the title property.
     */
    setTitle(title: string): void;

    /**
     * Returns the value of the <code>zoomOnClick</code> property.
     *
     * @return True if zoomOnClick property is set.
     */
    getZoomOnClick(): boolean;

    /**
     *  Sets the value of the <code>zoomOnClick</code> property.
     *
     *  @param zoomOnClick The value of the zoomOnClick property.
     */
    setZoomOnClick(zoomOnClick: boolean): void;

    /**
     * Returns the value of the <code>averageCenter</code> property.
     *
     * @return True if averageCenter property is set.
     */
    getAverageCenter(): boolean;

    /**
     *  Sets the value of the <code>averageCenter</code> property.
     *
     *  @param averageCenter The value of the averageCenter property.
     */
    setAverageCenter(averageCenter: boolean): void;

    /**
     * Returns the value of the <code>ignoreHidden</code> property.
     *
     * @return True if ignoreHidden property is set.
     */
    getIgnoreHidden(): boolean;

    /**
     * Sets the value of the <code>ignoreHidden</code> property.
     *
     * @param ignoreHidden The value of the ignoreHidden property.
     */
    setIgnoreHidden(ignoreHidden: boolean): void;

    /**
     * Returns the value of the <code>enableRetinaIcons</code> property.
     *
     * @return True if enableRetinaIcons property is set.
     */
    getEnableRetinaIcons(): boolean;

    /**
     * Sets the value of the <code>enableRetinaIcons</code> property.
     *
     * @param enableRetinaIcons The value of the enableRetinaIcons property.
     */
    setEnableRetinaIcons(enableRetinaIcons: boolean): void;

    /**
     * Returns the value of the <code>imageExtension</code> property.
     *
     * @return The value of the imageExtension property.
     */
    getImageExtension(): string;

    /**
     * Sets the value of the <code>imageExtension</code> property.
     *
     * @param imageExtension The value of the imageExtension property.
     */
    setImageExtension(imageExtension: string): void;

    /**
     * Returns the value of the <code>imagePath</code> property.
     *
     * @return The value of the imagePath property.
     */
    getImagePath(): string;

    /**
     * Sets the value of the <code>imagePath</code> property.
     *
     * @param imagePath The value of the imagePath property.
     */
    setImagePath(imagePath: string): void;

    /**
     * Returns the value of the <code>imageSizes</code> property.
     *
     * @return The value of the imageSizes property.
     */
    getImageSizes(): number[];

    /**
     * Sets the value of the <code>imageSizes</code> property.
     *
     * @param imageSizes The value of the imageSizes property.
     */
    setImageSizes(imageSizes: number[]): void;

    /**
     * Returns the value of the <code>calculator</code> property.
     *
     * @return the value of the calculator property.
     */
    getCalculator(): Calculator;

    /**
     * Sets the value of the <code>calculator</code> property.
     *
     * @param calculator The value
     *  of the calculator property.
     */
    setCalculator(calculator: Calculator): void;

    /**
     * Sets the value of the <code>hideLabel</code> property.
     *
     * @param printable The value of the hideLabel property.
     */
    setHideLabel(printable: boolean): void;

    /**
     * Returns the value of the <code>hideLabel</code> property.
     *
     * @return the value of the hideLabel property.
     */
    getHideLabel(): boolean;

    /**
     * Returns the value of the <code>batchSizeIE</code> property.
     *
     * @return the value of the batchSizeIE property.
     */
    getBatchSizeIE(): number;

    /**
     * Sets the value of the <code>batchSizeIE</code> property.
     *
     * @param batchSizeIE The value of the batchSizeIE property.
     */
    setBatchSizeIE(batchSizeIE: number): void;

    /**
     * Returns the value of the <code>clusterClass</code> property.
     *
     * @return the value of the clusterClass property.
     */
    getClusterClass(): string;

    /**
     * Sets the value of the <code>clusterClass</code> property.
     *
     * @param clusterClass The value of the clusterClass property.
     */
    setClusterClass(clusterClass: string): void;

    /**
     * Returns the array of markers managed by the clusterer.
     *
     * @return The array of markers managed by the clusterer.
     */
    getMarkers(): google.maps.Marker[];

    /**
     * Returns the number of markers managed by the clusterer.
     *
     * @return The number of markers.
     */
    getTotalMarkers(): number;

    /**
     * Returns the current array of clusters formed by the clusterer.
     *
     * @return The array of clusters formed by the clusterer.
     */
    getClusters(): Cluster[];

    /**
     * Returns the number of clusters formed by the clusterer.
     *
     * @return The number of clusters formed by the clusterer.
     */
    getTotalClusters(): number;

    /**
     * Adds a marker to the clusterer. The clusters are redrawn unless
     * <code>noDraw</code> is set to <code>true</code>.
     *
     * @param marker The marker to add.
     * @param [noDraw] Set to <code>true</code> to prevent redrawing.
     */
    addMarker(marker: google.maps.Marker, noDraw?: boolean): void;

    /**
     * Adds an array of markers to the clusterer. The clusters are redrawn unless
     * <code>noDraw</code> is set to <code>true</code>.
     *
     * @param markers The markers to add.
     * @param [noDraw] Set to <code>true</code> to prevent redrawing.
     */
    addMarkers(markers: google.maps.Marker[], noDraw?: boolean): void;

    /**
     * Pushes a marker to the clusterer.
     *
     * @param marker The marker to add.
     */
    pushMarkerTo_(marker: google.maps.Marker): void;

    /**
     * Removes a marker from the cluster and map.  The clusters are redrawn unless
     * <code>noDraw</code> is set to <code>true</code>. Returns <code>true</code> if the
     * marker was removed from the clusterer.
     *
     * @param marker The marker to remove.
     * @param [noDraw] Set to <code>true</code> to prevent redrawing.
     * @param [noMapRemove] Set to <code>true</code> to prevent removal from map but still removing from cluster management
     * @return True if the marker was removed from the clusterer.
     */
    removeMarker(marker: google.maps.Marker, noDraw?: boolean, noMapRemove?: boolean): boolean;

    /**
     * Removes an array of markers from the cluster and map. The clusters are redrawn unless
     * <code>noDraw</code> is set to <code>true</code>. Returns <code>true</code> if markers
     * were removed from the clusterer.
     *
     * @param markers The markers to remove.
     * @param [noDraw] Set to <code>true</code> to prevent redrawing.
     * @param [noMapRemove] Set to <code>true</code> to prevent removal from map but still removing from cluster management
     * @return True if markers were removed from the clusterer.
     */
    removeMarkers(markers: google.maps.Marker[], noDraw?: boolean, noMapRemove?: boolean): boolean;

    /**
     * Removes a marker and returns true if removed, false if not.
     *
     * @param marker The marker to remove
     * @param removeFromMap set to <code>true</code> to explicitly remove from map as well as cluster manangement
     * @return Whether the marker was removed or not
     */
    removeMarker_(marker: google.maps.Marker, removeFromMap?: boolean): boolean;

    /**
     * Removes all clusters and markers from the map and also removes all markers
     * managed by the clusterer.
     */
    clearMarkers(): void;

    /**
     * Recalculates and redraws all the marker clusters from scratch.
     * Call this after changing any properties.
     */
    repaint(): void;

    /**
     * Returns the current bounds extended by the grid size.
     *
     * @param bounds The bounds to extend.
     * @return The extended bounds.
     * @ignore
     */
    getExtendedBounds(bounds: google.maps.LatLngBounds): google.maps.LatLngBounds;

    /**
     * Redraws all the clusters.
     */
    redraw_(): void;

    /**
     * Removes all clusters from the map. The markers are also removed from the map
     * if <code>hide</code> is set to <code>true</code>.
     *
     * @param [hide] Set to <code>true</code> to also remove the markers
     *      from the map.
     */
    resetViewport_(hide?: boolean): void;

    /**
     * Calculates the distance between two latlng locations in km.
     *
     * @param p1 The first lat lng point.
     * @param p2 The second lat lng point.
     * @return The distance between the two points in km.
     * @see http://www.movable-type.co.uk/scripts/latlong.html
     */
    distanceBetweenPoints_(p1: google.maps.LatLng, p2: google.maps.LatLng): number;

    /**
     * Determines if a marker is contained in a bounds.
     *
     * @param marker The marker to check.
     * @param bounds The bounds to check against.
     * @return True if the marker is in the bounds.
     */
    isMarkerInBounds_(marker: google.maps.Marker, bounds: google.maps.LatLngBounds): boolean;

    /**
     * Adds a marker to a cluster, or creates a new cluster.
     *
     * @param marker The marker to add.
     */
    addToClosestCluster_(marker: google.maps.Marker): void;

    /**
     * Creates the clusters. This is done in batches to avoid timeout errors
     * in some browsers when there is a huge number of markers.
     *
     * @param iFirst The index of the first marker in the batch of
     *      markers to be added to clusters.
     */
    createClusters_(iFirst: number): void;

    /**
     * Extends an object's prototype by another's.
     *
     * @param obj1 The object to be extended.
     * @param obj2 The object to extend with.
     * @return The new extended object.
     * @ignore
     */
    extend(obj1: object, obj2: object): object;

    /**
     * The default function for determining the label text and style
     * for a cluster icon.
     *
     * @param markers The array of markers represented by the cluster.
     * @param numStyles The number of marker styles available.
     * @return The information resource for the cluster.
     * @ignore
     */
    static CALCULATOR: Calculator;

    /**
     * The number of markers to process in one batch.
     *
     */
    static BATCH_SIZE: number;

    /**
     * The number of markers to process in one batch (IE only).
     *
     */
    static BATCH_SIZE_IE: number;

    /**
     * The default root name for the marker cluster images.
     *
     */
    static IMAGE_PATH: string;

    /**
     * The default extension name for the marker cluster images.
     *
     */
    static IMAGE_EXTENSION: string;

    /**
     * The default array of sizes for the marker cluster images.
     *
     */
    static IMAGE_SIZES: number[];
}

interface String {
    trim(): string;
}