Initial commit for the Angular part. We are nowhere yet.

bookie/src/app/shared/to-csv.service.ts

@@ -0,0 +1,18 @@
+import {Injectable} from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ToCsvService {
+
+  constructor() {
+  }
+
+  toCsv(headers: any, data: any[]): string {
+    const header = Object.keys(headers);
+    const replacer = (key, value) => value === null ? '' : value;
+    const csv = data.map(row => header.map(fieldName => JSON.stringify(row[headers[fieldName]], replacer)).join(','));
+    csv.unshift(header.join(','));
+    return csv.join('\r\n');
+  }
+}