Updated download functions & added CSV serializer

src/csv.ts

@@ -0,0 +1,26 @@
+import {dotNotation, flattenObj} from './objects.ts';
+
+/**
+ * Convert an object to a CSV string
+ *
+ * @param {any[]} target Array of objects to create CSV from
+ * @param {boolean} flatten Should nested object be flattened or treated as values
+ * @return {string} CSV string
+ */
+export function csv(target: any[], flatten=true) {
+	const headers = target.reduce((acc, row) => {
+		Object.keys(flatten ? flattenObj(row) : row)
+			.forEach(key => { if(!acc.includes(key)) acc.push(key); });
+		return acc;
+	}, []);
+	return [
+		headers.join(','),
+		...target.map(row => headers.map((h: string) => {
+			const value = dotNotation<any>(row, h);
+			const type = typeof value;
+			if(type == 'string' && value.includes(',')) return `"${value}"`;
+			if(type == 'object') return `"${JSON.stringify(value)}"`;
+			return value;
+		}).join(','))
+	].join('\n');
+}