Add new task skeleton

task_2_ts/ts/csv.ts

@@ -0,0 +1,30 @@
+import {
+    csv2json
+} from 'json-2-csv';
+
+export type CSV_Data = Array<Record<string, unknown>>;
+
+const convertCSVtoJSON = async ( csvText: string ) => {
+    // Type cast OK, as the typing of the external library is not perfect.
+    return ( await csv2json( csvText ) ) as CSV_Data;
+};
+
+/**
+ * Reads a CSV file and returns the data as JSON.
+ * @param event The change event of the file input.
+ */
+export const readCSV = async ( event: Event ): Promise<CSV_Data> => {
+    if ( !( event.target instanceof HTMLInputElement ) ) {
+        throw new Error( 'Not an HTMLInputElement' );
+    }
+
+    const file = event.target.files?.[0];
+
+    if ( file == null ) {
+        throw new Error( 'No file selected' );
+    }
+
+    const result = await file.text();
+
+    return await convertCSVtoJSON( result );
+};