store data into InfluxDB 2.0 with Node.js

index.js

const { InfluxDB, FluxTableMetaData } = require('@influxdata/influxdb-client')

let client = new InfluxDB({ url: 'http://localhost:9999', token: process.env.INFLUXDB_TOKEN });
const writeApi = client.getWriteApi(process.env.INFLUXDB_ORG, process.env.INFLUXDB_BUCKET);

//...

let offlineSince = (lastSeenDate === null) ? 0 : ((new Date().getTime() - lastSeenDate.getTime()) / 1000).toFixed(0);
if (offlineSince < 0)
    offlineSince = 0;

let data = `status,contactName=${contactTarget} offlineSince=${offlineSince}u`;
writeApi.writeRecord(data);