Unexpected token '?'

I am running this example:

import { RateLimiter } from "limiter";

// Allow 150 requests per hour (the Twitter search limit). Also understands
// 'second', 'minute', 'day', or a number of milliseconds
const limiter = new RateLimiter({ tokensPerInterval: 150, interval: "hour" });

async function sendRequest() {
  // This call will throw if we request more than the maximum number of requests
  // that were set in the constructor
  // remainingRequests tells us how many additional requests could be sent
  // right this moment
  const remainingRequests = await limiter.removeTokens(1);
  callMyRequestSendingFunction(...);
}

and i am getting this error:

this.fireImmediately = fireImmediately ?? false;
                                                ^

SyntaxError: Unexpected token '?'

[jhurliman]

Fixed in https://github.com/jhurliman/node-rate-limiter/pull/79

[jhurliman]

Thanks. I think the issue is targeting ESNext with the TypeScript -> JS compilation, which breaks support for node v12. I’ll change the compilation target to ES2019.