hk-bus-eta-skpracta/esm/kmb.js

Query the ETA (Estimated Time of Arrival) of HK Bus/Minibus/MTR/Lightrail (skpracta flavored)

import { isSafari } from "./utils";
// parameter seq is 0-indexed here
export default function fetchEtas({ stopId, route, seq, serviceType, stops, co, bound, }) {
    return fetch(`https://data.etabus.gov.hk/v1/transport/kmb/eta/${stopId}/${route}/${serviceType}`, {
        cache: isSafari ? "default" : "no-store",
    })
        .then((response) => response.json())
        .then(({ data }) => data
        .filter((e) => e.eta !== null && e.dir === bound)
        .sort((a, b) => Math.abs(a.seq - seq) < Math.abs(b.seq - seq) ? -1 : 1)
        .filter((eta, _, self) => eta.seq === self[0].seq)
        // if KMB is the only service provider and the service type is matched,
        // then sequence number should be exact matched, noted that eta.seq is 1-indexed
        .filter((eta) => co.length > 1 ||
        serviceType !== eta.service_type ||
        eta.seq === seq + 1)
        .filter((eta) => {
        if (stops[stops.length - 1] === stops[0]) {
            // handle circular route
            if (stopId === stops[0]) {
                return eta.seq === seq + 1;
            }
        }
        return true;
    })
        .map((e) => ({
        eta: e.eta,
        remark: {
            zh: e.rmk_tc,
            en: e.rmk_en,
        },
        dest: {
            zh: e.dest_tc,
            en: e.dest_en,
        },
        co: "kmb",
    })));
}
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