wip

packages/shared/domain/Option.ts

@@ -0,0 +1,7 @@
+export function coalesce<T>(value: T | undefined | null, fallback: T): T {
+  return value ?? fallback;
+}
+
+export function present<T>(value: T | undefined | null): T | undefined {
+  return value === undefined || value === null ? undefined : value;
+}

packages/shared/domain/index.ts

@@ -1,3 +1,4 @@
 export * from './Entity';
 export * from './ValueObject';
-export * from './Service';
+export * from './Service';
+export * from './Option';