fix(compiler-cli): Support resolve animation name from the DTS (#45169)

ivanwonder · thePunderWoman · commit 6c906a5bb9f7 · 2022-02-24T00:54:33.000Z
Before this, the compiler resolves the value in the DTS as dynamic. If the `trigger` is imported from `@angular/animations`, this PR will use FFR to simulate the actual implementation in JS and extracts the animation name. PR Close #45169
diff --git a/packages/compiler-cli/src/ngtsc/annotations/src/component.ts b/packages/compiler-cli/src/ngtsc/annotations/src/component.ts
@@ -33,7 +33,7 @@ import {DirectiveSymbol, extractDirectiveMetadata, parseFieldArrayValue} from '.
 import {compileDeclareFactory, compileNgFactoryDefField} from './factory';
 import {extractClassMetadata} from './metadata';
 import {NgModuleSymbol} from './ng_module';
-import {compileResults, findAngularDecorator, isAngularCoreReference, isExpressionForwardReference, readBaseClass, resolveProvidersRequiringFactory, toFactoryMetadata, unwrapExpression, wrapFunctionExpressionsInParens} from './util';
+import {animationTriggerResolver, compileResults, findAngularDecorator, isAngularCoreReference, isExpressionForwardReference, readBaseClass, resolveProvidersRequiringFactory, toFactoryMetadata, unwrapExpression, wrapFunctionExpressionsInParens} from './util';
 
 const EMPTY_MAP = new Map<string, Expression>();
 const EMPTY_ARRAY: any[] = [];
@@ -352,7 +352,8 @@ export class ComponentDecoratorHandler implements
     let animationTriggerNames: AnimationTriggerNames|null = null;
     if (component.has('animations')) {
       animations = new WrappedNodeExpr(component.get('animations')!);
-      const animationsValue = this.evaluator.evaluate(component.get('animations')!);
+      const animationsValue =
+          this.evaluator.evaluate(component.get('animations')!, animationTriggerResolver);
       animationTriggerNames = {includesDynamicAnimations: false, staticTriggerNames: []};
       collectAnimationNames(animationsValue, animationTriggerNames);
     }
diff --git a/packages/compiler-cli/src/ngtsc/annotations/src/util.ts b/packages/compiler-cli/src/ngtsc/annotations/src/util.ts
@@ -596,3 +596,25 @@ export function toFactoryMetadata(
     target
   };
 }
+
+export function isAngularAnimationsReference(reference: Reference, symbolName: string): boolean {
+  return reference.ownedByModuleGuess === '@angular/animations' &&
+      reference.debugName === symbolName;
+}
+
+export const animationTriggerResolver: ForeignFunctionResolver = (ref, args) => {
+  const animationTriggerMethodName = 'trigger';
+  if (!isAngularAnimationsReference(ref, animationTriggerMethodName)) {
+    return null;
+  }
+  const triggerNameExpression = args[0];
+  if (!triggerNameExpression) {
+    return null;
+  }
+  const factory = ts.factory;
+  return factory.createObjectLiteralExpression(
+      [
+        factory.createPropertyAssignment(factory.createIdentifier('name'), triggerNameExpression),
+      ],
+      true);
+};
diff --git a/packages/compiler-cli/src/ngtsc/annotations/test/component_spec.ts b/packages/compiler-cli/src/ngtsc/annotations/test/component_spec.ts
@@ -407,13 +407,16 @@ runInEachFileSystem(() => {
           name: _('/node_modules/@angular/core/index.d.ts'),
           contents: 'export const Component: any;',
         },
+        {
+          name: _('/node_modules/@angular/animations/index.d.ts'),
+          contents: 'export declare function trigger(name: any): any',
+        },
         {
           name: _('/entry.ts'),
           contents: `
           import {Component} from '@angular/core';
-          function trigger(name) {
-            return {name};
-          }
+          import {trigger} from '@angular/animations';
+
           @Component({
             template: '',
             animations: [
@@ -446,13 +449,16 @@ runInEachFileSystem(() => {
           name: _('/node_modules/@angular/core/index.d.ts'),
           contents: 'export const Component: any;',
         },
+        {
+          name: _('/node_modules/@angular/animations/index.d.ts'),
+          contents: 'export declare function trigger(name: any): any',
+        },
         {
           name: _('/entry.ts'),
           contents: `
           import {Component} from '@angular/core';
-          function trigger(name) {
-            return {name};
-          }
+          import {trigger} from '@angular/animations';
+
           function buildComplexAnimations() {
             const name = 'complex';
             return [trigger(name)];
@@ -487,13 +493,16 @@ runInEachFileSystem(() => {
           name: _('/node_modules/@angular/core/index.d.ts'),
           contents: 'export const Component: any;',
         },
+        {
+          name: _('/node_modules/@angular/animations/index.d.ts'),
+          contents: 'export declare function trigger(name: any): any',
+        },
         {
           name: _('/entry.ts'),
           contents: `
           import {Component} from '@angular/core';
-          function trigger(name) {
-            return {name};
-          }
+          import {trigger} from '@angular/animations';
+
           function buildComplexAnimations() {
             const name = 'complex';
             return [trigger(name)];
