Merge pull request #5 from lorenzofox3/fix__issue_4

fix #4

src/index.d.ts

@@ -69,7 +69,7 @@ type ModuleAPI<Registry, PublicAPI extends Array<keyof Registry> = []> = {
 type ProviderFnArgs<Registry extends ObjectLike> = {
   [key in keyof ExternalDeps<Registry>]:
     | ExternalDeps<Registry>[key]
-    | ((arg?: FlatDependencyTree<Registry>) => ExternalDeps<Registry>[key]);
+    | ((arg: InjectableMap<Registry>) => ExternalDeps<Registry>[key]); // technically there is no constraint on arg, it is quite the opposite: it may bring new constraints but this gets contrived.
 };
 
 export type ProviderFn<

src/test.ts

@@ -272,3 +272,19 @@ fromClass: {
   // not a class
   fromClass(() => 42);
 }
+
+issue4: {
+  let injectables = {
+    a: ({ value }: { value: number }) => value + 10,
+    intermediate: () => '120',
+  };
+  const provideMissingWithIntermediate = createProvider({
+    injectables: injectables,
+    api: ['a']
+  });
+
+
+  provideMissingWithIntermediate({
+    value: ({ intermediate }: { intermediate: string }) => Number(intermediate)
+  })
+}