Tram stops example

trams.js

#!/usr/bin/env node

const fetch = require("node-fetch");

const query = 
`
{
  stops(ids: ["HSL:1040406", "HSL:1050432"]) {
    name
    stoptimesForPatterns {
      pattern {
        id
        route {
          id
          shortName
        }
      }
      stoptimes {
        realtimeDeparture
        serviceDay
        realtime
      }
    }
  }
}
`;

async function main({ interval }) {

  const response = await fetch("https://api.digitransit.fi/routing/v1/routers/hsl/index/graphql", {
    method: "POST",
    headers: {
      "Content-Type": "application/graphql"
    },
    body: query 
  });

  const body = await response.json();

  if (!body) {
    throw new Error("No data to show");
  }

  const { data } = body;

  const formatted = data.stops.map( ({ name, stoptimesForPatterns }) => ({
    name,
    trams: String(stoptimesForPatterns.map(s => s.pattern.route).flatMap(s => s.shortName))
  }));

  console.table(formatted);
  
  return setTimeout(main, interval, { interval });

}

main({ interval: 5000 });