Version: Next

collectionOf

Enforce expectations about types of FeatureCollection inputs for Turf. Internally this uses geojsonType to judge geometry types.

Name	Type	Description
featureCollection	FeatureCollection	a FeatureCollection for which features will be judged
type	string	expected GeoJSON type
name	string	name of calling function

$ npm install @turf/invariant

import { collectionOf } from "@turf/invariant";
const result = collectionOf(...);

$ npm install @turf/turf

import * as turf from "@turf/turf";
const result = turf.collectionOf(...);