How to use @turf/line-segment - 5 common examples

line2.type === "Feature" &&
        line1.geometry !== null &&
        line2.geometry !== null &&
        line1.geometry.type === "LineString" &&
        line2.geometry.type === "LineString" &&
        line1.geometry.coordinates.length === 2 &&
        line2.geometry.coordinates.length === 2) {
        const intersect = intersects(line1, line2);
        if (intersect) { results.push(intersect); }
        return featureCollection(results);
    }

    // Handles complex GeoJSON Geometries
    const tree = rbush();
    tree.load(lineSegment(line2));
    featureEach(lineSegment(line1), (segment) => {
        featureEach(tree.search(segment), (match) => {
            const intersect = intersects(segment, match);
            if (intersect) {
                // prevent duplicate points https://github.com/Turfjs/turf/issues/688
                const key = getCoords(intersect).join(",");
                if (!unique[key]) {
                    unique[key] = true;
                    results.push(intersect);
                }
            }
        });
    });
    return featureCollection(results);
}

function splitLineWithPoint(line, splitter) {
    var results = [];

    // handle endpoints
    var startPoint = getCoords(line)[0];
    var endPoint = getCoords(line)[line.geometry.coordinates.length - 1];
    if (pointsEquals(startPoint, getCoords(splitter)) ||
        pointsEquals(endPoint, getCoords(splitter))) return featureCollection([line]);

    // Create spatial index
    var tree = rbush();
    var segments = lineSegment(line);
    tree.load(segments);

    // Find all segments that are within bbox of splitter
    var search = tree.search(splitter);

    // Return itself if point is not within spatial index
    if (!search.features.length) return featureCollection([line]);

    // RBush might return multiple lines - only process the closest line to splitter
    var closestSegment = findClosestFeature(splitter, search);

    // Initial value is the first point of the first segments (beginning of line)
    var initialValue = [startPoint];
    var lastCoords = featureReduce(segments, function (previous, current, index) {
        var currentCoords = getCoords(current)[1];
        var splitterCoords = getCoords(splitter);

if (line1.type === "Feature" &&
        line2.type === "Feature" &&
        line1.geometry !== null &&
        line2.geometry !== null &&
        line1.geometry.type === "LineString" &&
        line2.geometry.type === "LineString" &&
        line1.geometry.coordinates.length === 2 &&
        line2.geometry.coordinates.length === 2) {
        const intersect = intersects(line1, line2);
        if (intersect) { results.push(intersect); }
        return featureCollection(results);
    }

    // Handles complex GeoJSON Geometries
    const tree = rbush();
    tree.load(lineSegment(line2));
    featureEach(lineSegment(line1), (segment) => {
        featureEach(tree.search(segment), (match) => {
            const intersect = intersects(segment, match);
            if (intersect) {
                // prevent duplicate points https://github.com/Turfjs/turf/issues/688
                const key = getCoords(intersect).join(",");
                if (!unique[key]) {
                    unique[key] = true;
                    results.push(intersect);
                }
            }
        });
    });
    return featureCollection(results);
}

function booleanParallel(line1: Feature | LineString, line2: Feature | LineString): boolean {
    // validation
    if (!line1) throw new Error('line1 is required');
    if (!line2) throw new Error('line2 is required');
    var type1 = getType(line1, 'line1');
    if (type1 !== 'LineString') throw new Error('line1 must be a LineString');
    var type2 = getType(line2, 'line2');
    if (type2 !== 'LineString') throw new Error('line2 must be a LineString');

    var segments1 = lineSegment(cleanCoords(line1)).features;
    var segments2 = lineSegment(cleanCoords(line2)).features;

    for (var i = 0; i < segments1.length; i++) {
        var segment1 = segments1[i].geometry.coordinates;
        if (!segments2[i]) break;
        var segment2 = segments2[i].geometry.coordinates;
        if (!isParallel(segment1, segment2)) return false;
    }
    return true;
}

line2: Feature | G2,
    options: {tolerance?: number}={}
): FeatureCollection {
    // Optional parameters
    options = options || {};
    if (!isObject(options)) throw new Error('options is invalid');
    var tolerance = options.tolerance || 0;

    // Containers
    var features = [];

    // Create Spatial Index
    var tree = rbush();

    // To-Do -- HACK way to support typescript
    const line: any = lineSegment(line1);
    tree.load(line);
    var overlapSegment;

    // Line Intersection

    // Iterate over line segments
    segmentEach(line2, function (segment) {
        var doesOverlaps = false;

        // Iterate over each segments which falls within the same bounds
        featureEach(tree.search(segment), function (match) {
            if (doesOverlaps === false) {
                var coordsSegment = getCoords(segment).sort();
                var coordsMatch: any = getCoords(match).sort();

                // Segment overlaps feature