Importing mapshaper in ES6

import_mapshaper.js

// npm install mapshaper --save

import mapshaper from 'mapshaper'

// Example of runCommands: converting a directory of Shapefiles to GeoJSON
mapshaper.runCommands('-i shapefiles/*.shp -o geojson/ format=geojson');

// ----

// Example of applyCommands: processing a json array
const makeGeojson = async (data) => {
	const input = { 'input.json': data };
	const cmd = '-i input.json -points x=lon y=lat -o output.geojson';

	const output = await mapshaper.applyCommands(cmd, input);
	return output;
};

// ... then:
	const geojson = await makeGeojson(some_json_data);

  // this is now an object that looks like this:
  // {
  //    'output.geojson': <Buffer 7b 22 74 79 70 65 22 3a 22 46 65 ... 409108 more bytes>
  // }

  // so to use, need to convert the buffer
	console.log(geojson['output.geojson'].toString(), false, 2);

  // =>
  // {"type":"FeatureCollection", "features": [
  // {"type":"Feature","geometry":{"type":"Point","coordinates":[171.84,50.169]},"properties":{"locationName":"DART 21415","locationCountry":"United States","nyt_location_override":"An ocean sensor","nyt_place_elaboration":"180 miles south of Attu Island","nyt_state":"Alaska","data_geo_link":"https://www.google.com/maps/place/50.169,171.840","nyt_location_slug":"dart21415|50.169|171.840","lat":"50.169","lon":"171.84","tz_override_location":"Attu Island","tz_override_latitude":"52.9025","tz_override_longitude":"172.909444","geocode_verify":"Alaska, United States"}},
  // {"type":"Feature","geometry":{"type":"Point","coordinates":[173.6,52.38]},"properties":{"locationName":"Karab Cove","locationCountry":"United States","nyt_location_override":"Agattu Island","nyt_place_elaboration":"","nyt_state":"Alaska","data_geo_link":"https://www.google.com/maps/place/52.380,173.600","nyt_location_slug":"karabcove|52.380|173.600","lat":"52.38","lon":"173.6","tz_override_location":"","tz_override_latitude":"","tz_override_longitude":"","geocode_verify":""}},
  // ...etc