fix(common,core): align the logic of optional provider

packages/common/module-utils/utils/get-injection-providers.util.ts

@@ -1,3 +1,4 @@
+import { isUndefined } from '../../utils/shared.utils';
 import {
   InjectionToken,
   Provider,
@@ -6,15 +7,17 @@ import {
 } from '../../interfaces';
 
 /**
- * check if x is OptionalFactoryDependency, based on prototype presence
- * (to avoid classes with a static 'token' field)
- * @param x
- * @returns x is OptionalFactoryDependency
+ * @param value
+ * @returns `true` if value is `OptionalFactoryDependency`
  */
 function isOptionalFactoryDependency(
-  x: InjectionToken | OptionalFactoryDependency,
-): x is OptionalFactoryDependency {
-  return !!((x as any)?.token && !(x as any)?.prototype);
+  value: InjectionToken | OptionalFactoryDependency,
+): value is OptionalFactoryDependency {
+  return (
+    !isUndefined((value as OptionalFactoryDependency).token) &&
+    !isUndefined((value as OptionalFactoryDependency).optional) &&
+    !(value as any).prototype
+  );
 }
 
 const mapInjectToTokens = (t: InjectionToken | OptionalFactoryDependency) =>

packages/common/test/module-utils/utils/get-injection-providers.util.spec.ts

@@ -5,19 +5,30 @@ import { getInjectionProviders } from '../../../module-utils/utils/get-injection
 describe('getInjectionProviders', () => {
   it('should take only required providers', () => {
     class C {
-      static token = 'a';
+      static token = 'anything';
     }
-    const p: Provider[] = [
+    class G {
+      static token = 'anything';
+      static optional = true;
+    }
+    class H {
+      static token = 'anything';
+      static optional = false;
+    }
+    const providers: Provider[] = [
       {
+        //0
         provide: 'a',
         useValue: 'a',
       },
       {
+        //1
         provide: 'b',
         useValue: 'b',
       },
-      C,
+      C, //2
       {
+        //3
         provide: 'd',
         useFactory: (c, b) => [c, b],
         inject: [
@@ -27,23 +38,36 @@ describe('getInjectionProviders', () => {
             optional: true,
           },
           'x',
+          G,
+          H,
         ],
       },
       {
+        //4
         provide: 'e',
         useFactory: (d, b) => [d, b],
         inject: ['d', 'b'],
       },
       {
+        //5
         provide: 'f',
         useValue: 'f',
       },
+      G, //6
+      H, //7
+    ];
+
+    const expected = [
+      providers[1],
+      providers[2],
+      providers[3],
+      providers[4],
+      providers[6],
+      providers[7],
     ];
-    // should not include 'a' and 'f'
-    const expected = p.slice(1, -1);
-    const result = getInjectionProviders(p, ['e']);
-    expect(result).to.have.length(expected.length);
+
+    const result = getInjectionProviders(providers, ['e']);
+
     expect(result).to.have.members(expected);
-    expect(result).not.to.have.members([p[0], p[5]]);
   });
 });

packages/core/injector/injector.ts

@@ -343,11 +343,20 @@ export class Injector {
     wrapper: InstanceWrapper<T>,
   ): [InjectorDependency[], number[]] {
     const optionalDependenciesIds = [];
-    const isOptionalFactoryDep = (
-      item: InjectionToken | OptionalFactoryDependency,
-    ): item is OptionalFactoryDependency =>
-      !isUndefined((item as OptionalFactoryDependency).token) &&
-      !isUndefined((item as OptionalFactoryDependency).optional);
+
+    /**
+     * Same as the internal utility function `isOptionalFactoryDependency` from `@nestjs/common`.
+     * We are duplicating it here because that one is not supposed to be exported.
+     */
+    function isOptionalFactoryDependency(
+      value: InjectionToken | OptionalFactoryDependency,
+    ): value is OptionalFactoryDependency {
+      return (
+        !isUndefined((value as OptionalFactoryDependency).token) &&
+        !isUndefined((value as OptionalFactoryDependency).optional) &&
+        !(value as any).prototype
+      );
+    }
 
     const mapFactoryProviderInjectArray = (
       item: InjectionToken | OptionalFactoryDependency,
@@ -356,7 +365,7 @@ export class Injector {
       if (typeof item !== 'object') {
         return item;
       }
-      if (isOptionalFactoryDep(item)) {
+      if (isOptionalFactoryDependency(item)) {
         if (item.optional) {
           optionalDependenciesIds.push(index);
         }