Made AppendResult to return next expected version without null

Assumed that if that fails then either it shall throw exception, or we should introduce more explicit result for supported failures

docs/getting-started.md

@@ -126,4 +126,4 @@ One of the mentioned benefits is testing, which Emmett helps to do out of the bo
 
 Tests for our Shopping Cart business logic can look like this:
 
-<<< @/snippets/gettingStarted/businessLogic.unit.test.ts#getting-started-unit-tests
+<<< @/snippets/gettingStarted/businessLogic.unit.spec.ts#getting-started-unit-tests

packages/emmett-expressjs/src/e2e/api.ts

@@ -52,7 +52,7 @@ export const shoppingCartApi = (eventStore: EventStore) => (router: Router) => {
         { expectedStreamVersion: STREAM_DOES_NOT_EXIST },
       );
 
-      setETag(response, toWeakETag(result!.nextExpectedStreamVersion));
+      setETag(response, toWeakETag(result.nextExpectedStreamVersion));
       sendCreated(response, shoppingCartId);
     },
   );
@@ -82,7 +82,7 @@ export const shoppingCartApi = (eventStore: EventStore) => (router: Router) => {
         { expectedStreamVersion: getExpectedStreamVersion(request) },
       );
 
-      setETag(response, toWeakETag(result!.nextExpectedStreamVersion));
+      setETag(response, toWeakETag(result.nextExpectedStreamVersion));
       response.sendStatus(204);
     },
   );
@@ -110,7 +110,7 @@ export const shoppingCartApi = (eventStore: EventStore) => (router: Router) => {
         { expectedStreamVersion: getExpectedStreamVersion(request) },
       );
 
-      setETag(response, toWeakETag(result!.nextExpectedStreamVersion));
+      setETag(response, toWeakETag(result.nextExpectedStreamVersion));
       response.sendStatus(204);
     },
   );
@@ -133,7 +133,7 @@ export const shoppingCartApi = (eventStore: EventStore) => (router: Router) => {
         { expectedStreamVersion: getExpectedStreamVersion(request) },
       );
 
-      setETag(response, toWeakETag(result!.nextExpectedStreamVersion));
+      setETag(response, toWeakETag(result.nextExpectedStreamVersion));
       response.sendStatus(204);
     },
   );
@@ -156,7 +156,7 @@ export const shoppingCartApi = (eventStore: EventStore) => (router: Router) => {
         { expectedStreamVersion: getExpectedStreamVersion(request) },
       );
 
-      setETag(response, toWeakETag(result!.nextExpectedStreamVersion));
+      setETag(response, toWeakETag(result.nextExpectedStreamVersion));
       response.sendStatus(204);
     },
   );

packages/emmett/src/eventStore/eventStore.ts

@@ -80,4 +80,4 @@ export type AppendToStreamOptions<StreamVersion = DefaultStreamVersionType> = {
 
 export type AppendToStreamResult<StreamVersion = DefaultStreamVersionType> = {
   nextExpectedStreamVersion: StreamVersion;
-} | null;
+};

tsconfig.json

@@ -4,7 +4,6 @@
   "exclude": ["node_modules", "tmp"],
   "files": [],
   "compilerOptions": {
-    "disableSourceOfProjectReferenceRedirect": true,
     "noEmit": true /* Do not emit outputs. */,
     "paths": {
       "@event-driven-io/emmett": ["./packages/emmett/src"],