fix(tsickle): support ctorParams in function closure (#12876)

See https://github.com/angular/tsickle/issues/261 for context.

modules/@angular/compiler-cli/src/static_reflector.ts

@@ -132,7 +132,6 @@ export class StaticReflector implements ReflectorReader {
           const ctor = (<any[]>ctorData).find(a => a['__symbolic'] == 'constructor');
           const parameterTypes = <any[]>this.simplify(type, ctor['parameters'] || []);
           const parameterDecorators = <any[]>this.simplify(type, ctor['parameterDecorators'] || []);
-
           parameters = [];
           parameterTypes.forEach((paramType, index) => {
             const nestedResult: any[] = [];

modules/@angular/compiler-cli/test/static_reflector_spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {StaticReflector, StaticReflectorHost, StaticSymbol} from '@angular/compiler-cli/src/static_reflector';
-import {HostListener, animate, group, keyframes, sequence, state, style, transition, trigger} from '@angular/core';
+import {HostListener, Inject, animate, group, keyframes, sequence, state, style, transition, trigger} from '@angular/core';
 import {MetadataCollector} from '@angular/tsc-wrapped';
 import * as ts from 'typescript';
 
@@ -410,6 +410,13 @@ describe('StaticReflector', () => {
     expect(props).toEqual({foo: []});
   });
 
+  it('should read ctor parameters with forwardRef', () => {
+    const src = '/tmp/src/forward-ref.ts';
+    const dep = host.getStaticSymbol(src, 'Dep');
+    const props = reflector.parameters(host.getStaticSymbol(src, 'Forward'));
+    expect(props).toEqual([[dep, new Inject(dep)]]);
+  });
+
   it('should report an error for invalid function calls', () => {
     expect(
         () =>
@@ -1068,6 +1075,18 @@ class MockReflectorHost implements StaticReflectorHost {
           providers: [ { provider: 'a', useValue: (() => 1)() }]
         })
         export class InvalidMetadata {}
+      `,
+      '/tmp/src/forward-ref.ts': `
+        import {forwardRef} from 'angular2/core';
+        import {Component} from 'angular2/src/core/metadata';
+        import {Inject} from 'angular2/src/core/di/metadata';
+        @Component({})
+        export class Forward {
+          constructor(@Inject(forwardRef(() => Dep)) d: Dep) {}
+        }
+        export class Dep {
+          @Input f: Forward;
+        }
       `
     };
 

modules/@angular/core/src/reflection/reflection_capabilities.ts

@@ -56,8 +56,12 @@ export class ReflectionCapabilities implements PlatformReflectionCapabilities {
     }
 
     // API of tsickle for lowering decorators to properties on the class.
-    if ((<any>type).ctorParameters) {
-      const ctorParameters = (<any>type).ctorParameters;
+    const tsickleCtorParams = (<any>type).ctorParameters;
+    if (tsickleCtorParams) {
+      // Newer tsickle uses a function closure
+      // Retain the non-function case for compatibility with older tsickle
+      const ctorParameters =
+          typeof tsickleCtorParams === 'function' ? tsickleCtorParams() : tsickleCtorParams;
       const paramTypes = ctorParameters.map((ctorParam: any) => ctorParam && ctorParam.type);
       const paramAnnotations = ctorParameters.map(
           (ctorParam: any) =>

modules/@angular/core/test/reflection/reflector_spec.ts

@@ -89,6 +89,25 @@ export function main() {
         const p = reflector.parameters(ClassWithoutDecorators);
         expect(p.length).toEqual(2);
       });
+
+      // See https://github.com/angular/tsickle/issues/261
+      it('should read forwardRef down-leveled type', () => {
+        class Dep {}
+        class ForwardLegacy {
+          constructor(d: Dep) {}
+          // Older tsickle had a bug: wrote a forward reference
+          static ctorParameters = [{type: Dep}];
+        }
+        expect(reflector.parameters(ForwardLegacy)).toEqual([[Dep]]);
+        class Forward {
+          constructor(d: Dep) {}
+          // Newer tsickle generates a functionClosure
+          static ctorParameters = () => [{type: ForwardDep}];
+        }
+        class ForwardDep {}
+        expect(reflector.parameters(Forward)).toEqual([[ForwardDep]]);
+      });
+
     });
 
     describe('propMetadata', () => {