fix(compiler): always check summaries first before falling back to me…

…tadata from .d.ts files (#18788)

PR Close #18788

packages/compiler/src/aot/static_symbol_resolver.ts

@@ -78,20 +78,22 @@ export class StaticSymbolResolver {
     if (staticSymbol.members.length > 0) {
       return this._resolveSymbolMembers(staticSymbol) !;
     }
-    let result = this.resolvedSymbols.get(staticSymbol);
-    if (result) {
-      return result;
+    // Note: always ask for a summary first,
+    // as we might have read shallow metadata via a .d.ts file
+    // for the symbol.
+    const resultFromSummary = this._resolveSymbolFromSummary(staticSymbol) !;
+    if (resultFromSummary) {
+      return resultFromSummary;
     }
-    result = this._resolveSymbolFromSummary(staticSymbol) !;
-    if (result) {
-      return result;
+    const resultFromCache = this.resolvedSymbols.get(staticSymbol);
+    if (resultFromCache) {
+      return resultFromCache;
     }
     // Note: Some users use libraries that were not compiled with ngc, i.e. they don't
     // have summaries, only .d.ts files. So we always need to check both, the summary
     // and metadata.
     this._createSymbolsOf(staticSymbol.filePath);
-    result = this.resolvedSymbols.get(staticSymbol) !;
-    return result;
+    return this.resolvedSymbols.get(staticSymbol) !;
   }
 
   /**

packages/compiler/test/aot/static_symbol_resolver_spec.ts

@@ -104,9 +104,18 @@ describe('StaticSymbolResolver', () => {
   });
 
   it('should use summaries in resolveSymbol and prefer them over regular metadata', () => {
-    const someSymbol = symbolCache.get('/test.ts', 'a');
-    init({'/test.ts': 'export var a = 2'}, [{symbol: someSymbol, metadata: 1}]);
-    expect(symbolResolver.resolveSymbol(someSymbol).metadata).toBe(1);
+    const symbolA = symbolCache.get('/test.ts', 'a');
+    const symbolB = symbolCache.get('/test.ts', 'b');
+    const symbolC = symbolCache.get('/test.ts', 'c');
+    init({'/test.ts': 'export var a = 2; export var b = 2; export var c = 2;'}, [
+      {symbol: symbolA, metadata: 1},
+      {symbol: symbolB, metadata: 1},
+    ]);
+    // reading the metadata of a symbol without a summary first,
+    // to test whether summaries are still preferred after this.
+    expect(symbolResolver.resolveSymbol(symbolC).metadata).toBe(2);
+    expect(symbolResolver.resolveSymbol(symbolA).metadata).toBe(1);
+    expect(symbolResolver.resolveSymbol(symbolB).metadata).toBe(1);
   });
 
   it('should be able to get all exported symbols of a file', () => {