mask() does not run with 10 or more polygons

[Stophface]

I can not run the turf.mask() function with more than 9 random created circles. It just does not return any result but crashes.

import { featureCollection, polygon } from '@turf/helpers';
import createCircle from '@turf/circle';
import createMask from '@turf/mask';

const howManyCircles = 9;

const cover = polygon([
    [[-180, -90], [180, -90], [180, 90], [-180, 90], [-180, -90]]
],
    { name: 'cover' });
const bbox = [83.16964204361335,83.47466091885153,-83.16964204362385,-83.47466091885192];
const randomPoints = randomPoint(howManyCircles, { bbox: bbox });
const radius = 1000;
const options = { steps: 64, units: 'kilometers', properties: { foo: 'bar' } };
    const circles = randomPoints.features.map(points => {
        return createCircle(points.geometry.coordinates, radius, options);
    });
const mask = createMask(featureCollection(circles), cover);

This works as expected. There are nine holes (created through the randomPoints() and then circle() function) in the polygon.
However, as soon as I change howManyCircles to a number greater than 9, I do not get any result. It calculates and calculates but does not come to an end. Here is a fiddle to play around with: https://jsfiddle.net/6m3qsnu1/

Why is that?

"@turf/helpers": "^6.3.0",
"@turf/random": "^6.3.0",
"@turf/turf": "^6.3.0",

[Stophface]

This problem got solved in v7.
When using yarn install @turf/turf it still installs ^6.3.0.
A npm install @turf/turf installs ^6.3.0 too. Installing it via npm install turf@7.0.0-alpha.1 installs the correct version. Maybe this should be solved?

[rowanwins]

Hi @Stophface

I'll need to look at porting the v7 mask code back into the v6 series. The challenge is that the current v6.x code is quite complex but it's not entirely clear why...