fix(@angular-devkit/build-optimizer): don't add pure to super calls

Fix angular/angular-cli#7799

Author: filipesilva

packages/angular_devkit/build_optimizer/src/transforms/prefix-functions.ts

@@ -70,6 +70,7 @@ export function findTopLevelFunctions(parentNode: ts.Node): ts.Node[] {
       topLevelFunctions.push(node.parent);
     } else if ((node.kind === ts.SyntaxKind.CallExpression
               || node.kind === ts.SyntaxKind.NewExpression)
+        && !isSuperCall(node)
         && !hasPureComment(node)
     ) {
       topLevelFunctions.push(node);
@@ -117,3 +118,9 @@ function hasPureComment(node: ts.Node) {
 
   return leadingComment && leadingComment.some((comment) => comment.text === pureFunctionComment);
 }
+
+function isSuperCall(node: ts.Node) {
+  const callExpr = node as ts.CallExpression;
+
+  return callExpr.expression && callExpr.expression.kind === ts.SyntaxKind.SuperKeyword;
+}

packages/angular_devkit/build_optimizer/src/transforms/prefix-functions_spec.ts

@@ -83,7 +83,7 @@ describe('prefix-functions', () => {
       expect(oneLine`${transform(input)}`).toEqual(oneLine`${output}`);
     });
 
-    it('doesn\'t adds comment when inside function declarations or expressions', () => {
+    it('doesn\'t add comment when inside function declarations or expressions', () => {
       const input = stripIndent`
         function funcDecl() {
           var newClazz = Clazz();
@@ -102,5 +102,21 @@ describe('prefix-functions', () => {
 
       expect(oneLine`${transform(input)}`).toEqual(oneLine`${output}`);
     });
+
+    it('doesn\'t add comment to super calls', () => {
+      const input = oneLine`
+        class ExtendedClass extends BaseClass {
+          constructor(e) {
+            super(e);
+          }
+        }
+      `;
+      const output = stripIndent`
+        ${emptyImportsComment}
+        ${input}
+      `;
+
+      expect(oneLine`${transform(input)}`).toEqual(oneLine`${output}`);
+    });
   });
 });