fix(ngcc): capture UMD/CommonJS inner class implementation node correctly (#39346)

Previously, UMD/CommonJS class inline declarations of the form:

```ts
exports.Foo = (function() { function Foo(); return Foo; })();
```

were capturing the whole IIFE as the implementation, rather than
the inner class (i.e. `function Foo() {}` in this case). This caused
the interpreter to break when it was trying to access such an export,
since it would try to evaluate the IIFE rather than treating it as a class
declaration.

PR Close #39346

packages/compiler-cli/ngcc/src/host/commonjs_host.ts

@@ -14,7 +14,8 @@ import {Declaration, DeclarationKind, Import} from '../../../src/ngtsc/reflectio
 import {BundleProgram} from '../packages/bundle_program';
 import {FactoryMap, isDefined} from '../utils';
 
-import {DefinePropertyReexportStatement, ExportDeclaration, ExportsStatement, extractGetterFnExpression, findNamespaceOfIdentifier, findRequireCallReference, isDefinePropertyReexportStatement, isExportsStatement, isExternalImport, isRequireCall, isWildcardReexportStatement, RequireCall, skipAliases, WildcardReexportStatement} from './commonjs_umd_utils';
+import {DefinePropertyReexportStatement, ExportDeclaration, ExportsStatement, extractGetterFnExpression, findNamespaceOfIdentifier, findRequireCallReference, isDefinePropertyReexportStatement, isExportsAssignment, isExportsStatement, isExternalImport, isRequireCall, isWildcardReexportStatement, RequireCall, skipAliases, WildcardReexportStatement} from './commonjs_umd_utils';
+import {getInnerClassDeclaration, getOuterNodeFromInnerDeclaration} from './esm2015_host';
 import {Esm5ReflectionHost} from './esm5_host';
 import {NgccClassSymbol} from './ngcc_host';
 
@@ -216,6 +217,27 @@ export class CommonJsReflectionHost extends Esm5ReflectionHost {
     return {node: module, known: null, viaModule, identity: null, kind: DeclarationKind.Concrete};
   }
 
+  /**
+   * If this is an IFE then try to grab the outer and inner classes otherwise fallback on the super
+   * class.
+   */
+  protected getDeclarationOfExpression(expression: ts.Expression): Declaration|null {
+    const inner = getInnerClassDeclaration(expression);
+    if (inner !== null) {
+      const outer = getOuterNodeFromInnerDeclaration(inner);
+      if (outer !== null && isExportsAssignment(outer)) {
+        return {
+          kind: DeclarationKind.Inline,
+          node: outer.left,
+          implementation: inner,
+          known: null,
+          viaModule: null,
+        };
+      }
+    }
+    return super.getDeclarationOfExpression(expression);
+  }
+
   private resolveModuleName(moduleName: string, containingFile: ts.SourceFile): ts.SourceFile
       |undefined {
     if (this.compilerHost.resolveModuleNames) {

packages/compiler-cli/ngcc/src/host/umd_host.ts

@@ -470,6 +470,27 @@ export class UmdReflectionHost extends Esm5ReflectionHost {
     return requireCall.arguments[0].text;
   }
 
+  /**
+   * If this is an IIFE then try to grab the outer and inner classes otherwise fallback on the super
+   * class.
+   */
+  protected getDeclarationOfExpression(expression: ts.Expression): Declaration|null {
+    const inner = getInnerClassDeclaration(expression);
+    if (inner !== null) {
+      const outer = getOuterNodeFromInnerDeclaration(inner);
+      if (outer !== null && isExportsAssignment(outer)) {
+        return {
+          kind: DeclarationKind.Inline,
+          node: outer.left,
+          implementation: inner,
+          known: null,
+          viaModule: null,
+        };
+      }
+    }
+    return super.getDeclarationOfExpression(expression);
+  }
+
   private resolveModuleName(moduleName: string, containingFile: ts.SourceFile): ts.SourceFile
       |undefined {
     if (this.compilerHost.resolveModuleNames) {

packages/compiler-cli/ngcc/test/host/commonjs_host_spec.ts

@@ -208,6 +208,7 @@ foo.decorators = [
   { type: core.Directive, args: [{ selector: '[ignored]' },] }
 ];
 exports.directives = [foo];
+exports.Inline = (function() { function Inline() {} return Inline; })();
 `,
       };
 
@@ -2422,11 +2423,16 @@ exports.MissingClass2 = MissingClass2;
           const file = getSourceFileOrError(bundle.program, _('/inline_export.js'));
           const exportDeclarations = host.getExportsOfModule(file);
           expect(exportDeclarations).not.toBeNull();
-          const decl = exportDeclarations!.get('directives') as InlineDeclaration;
-          expect(decl).toBeDefined();
-          expect(decl.node.getText()).toEqual('exports.directives');
-          expect(decl.implementation!.getText()).toEqual('[foo]');
-          expect(decl.kind).toEqual(DeclarationKind.Inline);
+          const entries: [string, InlineDeclaration][] =
+              Array.from(exportDeclarations!.entries()) as any;
+          expect(
+              entries.map(
+                  ([name, decl]) =>
+                      [name, decl.node!.getText(), decl.implementation!.getText(), decl.viaModule]))
+              .toEqual([
+                ['directives', 'exports.directives', '[foo]', null],
+                ['Inline', 'exports.Inline', 'function Inline() {}', null],
+              ]);
         });
 
         it('should recognize declarations of known TypeScript helpers', () => {

packages/compiler-cli/ngcc/test/host/umd_host_spec.ts

@@ -287,6 +287,7 @@ runInEachFileSystem(() => {
     { type: core.Directive, args: [{ selector: '[ignored]' },] }
   ];
   exports.directives = [foo];
+  exports.Inline = (function() { function Inline() {} return Inline; })();
 })));
 `,
         };
@@ -2732,10 +2733,8 @@ runInEachFileSystem(() => {
                 ['e', `e = 'e'`, null],
                 ['DirectiveX', `Directive: FnWithArg<(clazz: any) => any>`, '@angular/core'],
                 [
-                  'SomeClass', `SomeClass = (function() {
-    function SomeClass() {}
-    return SomeClass;
-  }())`,
+                  'SomeClass',
+                  'SomeClass = (function() {\n    function SomeClass() {}\n    return SomeClass;\n  }())',
                   null
                 ],
               ]);
@@ -2824,11 +2823,16 @@ runInEachFileSystem(() => {
           const file = getSourceFileOrError(bundle.program, INLINE_EXPORT_FILE.name);
           const exportDeclarations = host.getExportsOfModule(file);
           expect(exportDeclarations).not.toBe(null);
-          const decl = exportDeclarations!.get('directives') as InlineDeclaration;
-          expect(decl).toBeDefined();
-          expect(decl.node.getText()).toEqual('exports.directives');
-          expect(decl.implementation!.getText()).toEqual('[foo]');
-          expect(decl.kind).toEqual(DeclarationKind.Inline);
+          const entries: [string, InlineDeclaration][] =
+              Array.from(exportDeclarations!.entries()) as any;
+          expect(
+              entries.map(
+                  ([name, decl]) =>
+                      [name, decl.node!.getText(), decl.implementation!.getText(), decl.viaModule]))
+              .toEqual([
+                ['directives', 'exports.directives', '[foo]', null],
+                ['Inline', 'exports.Inline', 'function Inline() {}', null],
+              ]);
         });
 
         it('should recognize declarations of known TypeScript helpers', () => {

packages/compiler-cli/ngcc/test/integration/ngcc_spec.ts

@@ -467,6 +467,67 @@ runInEachFileSystem(() => {
              .not.toThrow();
        });
 
+    it('should support inline UMD/CommonJS exports declarations', () => {
+      // Setup an Angular entry-point in UMD module format that has an inline exports declaration
+      // referenced by an NgModule.
+      loadTestFiles([
+        {
+          name: _('/node_modules/test-package/package.json'),
+          contents: '{"name": "test-package", "main": "./index.js", "typings": "./index.d.ts"}'
+        },
+        {
+          name: _('/node_modules/test-package/index.js'),
+          contents: `
+          (function (global, factory) {
+            typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@angular/core')) :
+            typeof define === 'function' && define.amd ? define('test', ['exports', 'core'], factory) :
+            (factory(global.test, global.core));
+          }(this, (function (exports, core) { 'use strict';
+            exports.FooModule = /** @class */ (function () {
+              function FooModule() {}
+              FooModule = __decorate([
+                  core.NgModule({declarations: exports.declarations})
+              ], FooModule);
+              return FooModule;
+            }());
+
+            exports.declarations = [exports.FooDirective];
+
+            exports.FooDirective = /** @class */ (function () {
+              function FooDirective() {}
+              FooDirective = __decorate([
+                core.Directive({selector: '[foo]'})
+              ], FooDirective);
+              return FooDirective;
+            }());
+          })));
+          `
+        },
+        {
+          name: _('/node_modules/test-package/index.d.ts'),
+          contents: `
+          export declare class FooModule { }
+          export declare class FooDirective { }
+          `
+        },
+        {name: _('/node_modules/test-package/index.metadata.json'), contents: 'DUMMY DATA'},
+      ]);
+
+      expect(() => mainNgcc({
+               basePath: '/node_modules',
+               targetEntryPointPath: 'test-package',
+               propertiesToConsider: ['main'],
+             }))
+          .not.toThrow();
+
+      const processedFile = fs.readFile(_('/node_modules/test-package/index.js'));
+      expect(processedFile)
+          .toContain('FooModule.ɵmod = ɵngcc0.ɵɵdefineNgModule({ type: FooModule });');
+      expect(processedFile)
+          .toContain(
+              'ɵngcc0.ɵɵsetNgModuleScope(FooModule, { declarations: function () { return [exports.FooDirective]; } });');
+    });
+
     it('should not be able to evaluate code in external packages when no .d.ts files are present',
        () => {
          loadTestFiles([

packages/compiler-cli/src/ngtsc/partial_evaluator/src/interpreter.ts

@@ -342,10 +342,12 @@ export class StaticInterpreter {
   }
 
   private visitAmbiguousDeclaration(decl: Declaration, declContext: Context) {
-    return decl.kind === DeclarationKind.Inline && decl.implementation !== undefined ?
-        // Inline declarations with an `implementation` should be visited as expressions
+    return decl.kind === DeclarationKind.Inline && decl.implementation !== undefined &&
+            !isDeclaration(decl.implementation) ?
+        // Inline declarations whose `implementation` is a `ts.Expression` should be visited as
+        // an expression.
         this.visitExpression(decl.implementation, declContext) :
-        // Otherwise just visit the declaration `node`
+        // Otherwise just visit the `node` as a declaration.
         this.visitDeclaration(decl.node, declContext);
   }
 

packages/compiler-cli/src/ngtsc/reflection/src/host.ts

@@ -625,7 +625,7 @@ export interface DownleveledEnum {
 export interface InlineDeclaration extends
     BaseDeclaration<Exclude<DeclarationNode, ts.Declaration>> {
   kind: DeclarationKind.Inline;
-  implementation?: ts.Expression;
+  implementation?: DeclarationNode;
 }
 
 /**