Compare merged targetInitializer to target

Instead of the unmerged one

Author: Instagram Product Launch

src/compiler/checker.ts

@@ -898,11 +898,11 @@ namespace ts {
  const sourceInitializer = getJSInitializerSymbol(source);
  const init = getDeclaredJavascriptInitializer(targetValueDeclaration) || getAssignedJavascriptInitializer(targetValueDeclaration);
  let targetInitializer = init && init.symbol ? init.symbol : target;
+ if (!(targetInitializer.flags & SymbolFlags.Transient)) {
+ const mergedInitializer = getMergedSymbol(targetInitializer);
+ targetInitializer = mergedInitializer === targetInitializer ? cloneSymbol(targetInitializer) : mergedInitializer;
+ }
  if (sourceInitializer !== source || targetInitializer !== target) {
- if (!(targetInitializer.flags & SymbolFlags.Transient)) {
- const mergedInitializer = getMergedSymbol(targetInitializer);
- targetInitializer = mergedInitializer === targetInitializer ? cloneSymbol(targetInitializer) : mergedInitializer;
- }
  mergeSymbol(targetInitializer, sourceInitializer);
  }
  }