Update fixer.

Fixes #231.

ecmascript/transforms/src/compat/es2015/template_literal/tests.rs

@@ -1,5 +1,14 @@
 use super::*;
 
+test_exec!(
+    ::swc_ecma_parser::Syntax::default(),
+    |_| TemplateLiteral,
+    issue_231,
+    "const truthy = 'a=b';
+const foo = `http://example.com/foo/bar${truthy && '?'}${truthy}`;
+console.log(foo);"
+);
+
 test!(
     ::swc_ecma_parser::Syntax::default(),
     |_| TemplateLiteral,

ecmascript/transforms/src/fixer.rs

@@ -312,6 +312,13 @@ impl Fold<Expr> for Fixer {
                     e @ Expr::Assign(..) | e @ Expr::Seq(..) | e @ Expr::Yield(..) => {
                         box e.wrap_with_paren()
                     }
+                    Expr::Bin(BinExpr { op: op_of_rhs, .. }) => {
+                        if op_of_rhs.precedence() < expr.op.precedence() {
+                            box expr.right.wrap_with_paren()
+                        } else {
+                            expr.right
+                        }
+                    }
                     _ => expr.right,
                 };
 
@@ -604,4 +611,6 @@ function a() {
     test_fixer!(fixer_12, "(((a, b), c), d) + e;", "d + e;");
 
     test_fixer!(fixer_13, "delete (((1), a), (2));", "delete 2");
+
+    identical!(issue_231, "'' + (truthy && '?') + truthy;");
 }