Updated to angular 11

Now compiling with strict mode in typescript
Need to error checking now

bookie/src/app/shared/cookie.service.ts

@@ -20,7 +20,7 @@ export class CookieService {
     return '';
   }
 
-  public deleteCookie(name) {
+  public deleteCookie(name: string) {
     this.setCookie(name, '', -1);
   }
 

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

@@ -7,7 +7,7 @@ export class ToCsvService {
   // eslint-disable-next-line class-methods-use-this
   toCsv(headers: any, data: any[]): string {
     const header = Object.keys(headers);
-    const replacer = (key, value) => (value === null ? '' : value);
+    const replacer = (key: string, value: string | number | null) => (value === null ? '' : value);
     const csv = data.map((row) =>
       header.map((fieldName) => JSON.stringify(row[headers[fieldName]], replacer)).join(','),
     );