js-csp timers use case for alts

alts-timeout.js

let csp = require('js-csp')
let START, SHOULD_END, END

const app = () => {
  START = +(new Date);
  const ch = csp.chan();
  csp.go(function* () {
    yield csp.timeout(1000);
    yield csp.put(ch, 42);
  });

  csp.go(function* () {
    const cancel = csp.timeout(300);
    const result = yield csp.alts([ch, cancel]);
    console.log("Has been cancelled?", result.channel === cancel);
    SHOULD_END = +(new Date);
  });
}

process.on('exit', () => {
  END = +(new Date);
  console.info("end: %dms \t should-end: %dms", END - START, SHOULD_END - START);
});

app()
/**** OUTPUT: end: 1003ms      should-end: 325ms ****/