non-null type assertion (#1486)

(#1477 (review))

Author: Fil

examples/loader-airtable/src/data/penguins.csv.ts

@@ -6,7 +6,7 @@ const {AIRTABLE_PAT, AIRTABLE_DB} = process.env;
 
 Airtable.configure({apiKey: AIRTABLE_PAT});
 
-const base = Airtable.base(AIRTABLE_DB as string);
+const base = Airtable.base(AIRTABLE_DB!);
 
 const data: any[] = [];