jtBaseApp/node_modules/@turf/boolean-clockwise/dist/es/index.js

import { getCoords } from "@turf/invariant";
/**
 * Takes a ring and return true or false whether or not the ring is clockwise or counter-clockwise.
 *
 * @name booleanClockwise
 * @param {Feature<LineString>|LineString|Array<Array<number>>} line to be evaluated
 * @returns {boolean} true/false
 * @example
 * var clockwiseRing = turf.lineString([[0,0],[1,1],[1,0],[0,0]]);
 * var counterClockwiseRing = turf.lineString([[0,0],[1,0],[1,1],[0,0]]);
 *
 * turf.booleanClockwise(clockwiseRing)
 * //=true
 * turf.booleanClockwise(counterClockwiseRing)
 * //=false
 */
export default function booleanClockwise(line) {
    var ring = getCoords(line);
    var sum = 0;
    var i = 1;
    var prev;
    var cur;
    while (i < ring.length) {
        prev = cur || ring[0];
        cur = ring[i];
        sum += (cur[0] - prev[0]) * (cur[1] + prev[1]);
        i++;
    }
    return sum > 0;
}