Callback function to get Australia COVID-19 confirmed cases for Interactive Geo Maps WordPress plugin

callback.js

function igm_custom_filter_20921(data) {

	let auRegions = [];
	let codes = [
		{
			"region": "Australian Capital Territory",
			"code": "AU-ACT"
		},
		{
			"region": "New South Wales",
			"code": "AU-NSW"
		},
		{
			"region": "Victoria",
			"code": "AU-VIC"
		},
		{
			"region": "Queensland",
			"code": "AU-QLD"
		},
		{
			"region": "South Australia",
			"code": "AU-SA"
		},
		{
			"region": "Western Australia",
			"code": "AU-WA"
		},
		{
			"region": "Tasmania",
			"code": "AU-TAS"
		},
		{
			"region": "Northern Territory",
			"code": "AU-NT"
		},
		{
			"region": "Australian Capital Territory",
			"code": "AU-ACT"
		}
	];

	jQuery.ajax({
		url: "https://raw.githubusercontent.com/CSSEGISandData/COVID-19/301c88ffc4b0baeccc6dbeb10ba306ab1ae8544b/csse_covid_19_data/csse_covid_19_time_series/time_series_19-covid-Confirmed.csv",
		type: 'get',
		async: false,
		dataType: 'text',
		success: function (response) {
			const lines = response.split('\n');
			for (let line of lines) {
				const items = line.match(/(".*?"|[^",]+)(?=\s*,|\s*$)/g);
				if (!Array.isArray(items)) { continue; }
				if (items[1] !== 'Australia') { continue; }

				const peopleArr = items.slice(4);
				const value = parseInt(peopleArr[peopleArr.length - 1]);
				const name = items[0];

				const code = codes.filter(function (code) {
					return code.region == items[0];
				});

				if (code.length === 0) {
					continue;
				}

				// ranges
				/*  #feedde
					#fdbe85
					#fd8d3c
					#e6550d
					#a63603
				*/
				let color = '#feedde';

				if (value > 0 && value <= 100) {
					color = '#fdbe85';
				}
				else if (value > 100 && value <= 1000) {
					color = '#fd8d3c';
				}
				else if (value > 1000 && value <= 10000) {
					color = '#e6550d';
				}
				else if (value > 10000) {
					color = '#a63603';
				}

				const doc = {
					'id':  code[0].code,
					'name': name,
					'value': value,
					'fill': color,
					'hover': '#d94701',
					'useDefaults': '0'
				};
				auRegions.push({ ...doc });
			}
		}
	});
	data.regions = auRegions;
	return data;
}