config-loader: enable validation of required props in d.ts definitions + fix issues

app-config.yaml

@@ -270,7 +270,7 @@ costInsights:
 homepage:
   clocks:
     - label: UTC
-      timzone: UTC
+      timezone: UTC
     - label: NYC
       timezone: 'America/New_York'
     - label: STO

packages/backend-common/config.d.ts

@@ -15,7 +15,7 @@
  */
 
 export interface Config {
-  frontend: {
+  app: {
     baseUrl: string; // defined in core, but repeated here without doc
   };
 

packages/config-loader/src/lib/schema/collect.ts

@@ -150,7 +150,10 @@ function compileTsSchemas(currentDir: string, paths: string[]) {
       // All schemas should export a `Config` symbol
       'Config',
       // This enables usage of @visibility is doc comments
-      { validationKeywords: ['visibility'] },
+      {
+        required: true,
+        validationKeywords: ['visibility'],
+      },
       [schemaFile],
     ) as JsonObject | null;