code: private boolean isExportLhs(Node lhs) {
      if (!lhs.isQualifiedName()) {
        return false;
      }
      return lhs.matchesQualifiedName("exports")
          || (lhs.isGetProp() && lhs.getFirstChild().matchesQualifiedName("exports"));
    }
docs: Is this the LHS of a goog.module export? i.e. Either "exports" or "exports.name"