Function routeToLineString

Builds a GeoJSON LineString from a parsed flight plan route, ready to render as a polyline on a map (e.g. MapLibre, Leaflet).

Coordinates follow the GeoJSON [lon, lat] ordering. Returns undefined when the route yields fewer than two drawable points, since a LineString requires at least two positions to be valid.

import { createFlightplanResolver, routeToLineString } from '@squawk/flightplan';

const resolver = createFlightplanResolver({ airports, navaids, fixes, airways });
const route = resolver.parse('KJFK DCT MERIT J60 MARTN DCT KLAX');
const line = routeToLineString(route);
if (line) {
  map.addSource('route', { type: 'geojson', data: line });
}
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