c.on('data', data => {
   let obj = bser.loadFromBuffer(data)
   if (obj[0] == 'watch-project') {
     sendResponse({ watch: obj[1] })
   } else if (obj[0] == 'unsubscribe') {
     sendResponse({ path: obj[1] })
   } else if (obj[0] == 'clock') {
     sendResponse({ clock: 'clock' })
   } else if (obj[0] == 'version') {
     let { optional, required } = obj[1]
     let res = {}
     for (let key of Object.keys(optional)) {
       res[key] = true
     }
     for (let key of Object.keys(required)) {
       res[key] = true
     }
     sendResponse({ capabilities: res })
   } else if (obj[0] == 'subscribe') {
     sendResponse({ subscribe: obj[2] })
   } else {
     sendResponse({})
   }
 })

function roundtrip(val: any) {
    const encoded = bser.dumpToBuffer(val);
    const decoded = bser.loadFromBuffer(encoded);
    assert.deepStrictEqual(decoded, val);
}

import * as bser from "bser";

const encoded = bser.dumpToBuffer(["hello"]);
console.log(bser.loadFromBuffer(encoded)); // ['hello']