Getting toGeoJSON is not a function

i'm trying to find the number of point in a polygon using turf.js but when i run the code below, i'm getting Uncaught TypeError: turf.featureCollection(...).toGeoJSON is not a function.

            var healthCollection = turf.featureCollection(health)
            var adminCollection = turf.featureCollection(admin)
            console.log(healthCollection);
            console.log(admin);

            var points = turf.pointsWithinPolygon(healthCollection.toGeoJSON() , adminCollection.toGeoJSON());
            console.log(points);

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