@seasketch/geoprocessing/dist/src/helpers/toMultiPolygon.js

Geoprocessing and reporting framework for SeaSketch 2.0

import { multiPolygon } from "@turf/turf";
/**
 * Converts collection of polygons or multipolygons to a single multipolygon
 * @param input array or collection of polygons or multipolygons
 * @returns multipolygon
 */
export const toMultiPolygon = (input) => {
    const coords = (() => {
        const features = Array.isArray(input) ? input : input.features;
        return features.reduce((acc, poly) => {
            if (poly.geometry.type === "Polygon") {
                return [...acc, poly.geometry.coordinates];
            }
            else {
                return [...acc, ...poly.geometry.coordinates];
            }
        }, []);
    })();
    return multiPolygon(coords);
};
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