water-plant-uml/src/plantuml-encoder/deflate.js

CLI tool for live-reloading and/or exporting PlantUML diagrams using the default PlantUML server or a local Docker server.

const zlib = require('zlib');

module.exports = function (data) {
  return zlib.deflateRawSync(data, { level: 9 }).toString('binary');
};