---
source: crates/rome_formatter_test/src/snapshot_builder.rs
info:
  test_file: js/arrows/arrow_function_expression.js
---

# Input

```js
(a => {}).length
typeof (() => {});
export default (() => {})();
(() => {})()``;
(() => {})``;
new (() => {});
if ((() => {}) ? 1 : 0) {}
let f = () => ({}())
let a = () => ({} instanceof a);
a = () => ({} && a);
a = () => ({}() && a);
a = () => ({} && a && b);
a = () => ({} + a);
a = () => ({}()() && a);
a = () => ({}.b && a);
a = () => ({}[b] && a);
a = () => ({}`` && a);
a = () => ({} = 0);
a = () => ({}, a);
a => a instanceof {};
a => ({}().b && 0)
a => ({}().c = 0)
x => ({}()())
x => ({}()``)
x => ({}().b);
a = b => c;
x => (y = z);
x => (y += z);
f(a => ({})) + 1;
(a => ({})) || 0;
a = b => c;
a = b => {
  return c
};

```


# Prettier differences

```diff
--- Prettier
+++ Rome
@@ -6,24 +6,24 @@
 new (() => {})();
 if ((() => {}) ? 1 : 0) {
 }
-let f = () => ({}());
-let a = () => ({} instanceof a);
-a = () => ({} && a);
-a = () => ({}() && a);
-a = () => ({} && a && b);
-a = () => ({} + a);
-a = () => ({}()() && a);
-a = () => ({}.b && a);
-a = () => ({}[b] && a);
-a = () => ({}`` && a);
+let f = () => ({})();
+let a = () => ({}) instanceof a;
+a = () => ({}) && a;
+a = () => ({})() && a;
+a = () => ({}) && a && b;
+a = () => ({}) + a;
+a = () => ({})()() && a;
+a = () => ({}).b && a;
+a = () => ({})[b] && a;
+a = () => ({})`` && a;
 a = () => ({} = 0);
-a = () => ({}, a);
+a = () => (({}), a);
 (a) => a instanceof {};
-(a) => ({}().b && 0);
-(a) => ({}().c = 0);
-(x) => ({}()());
-(x) => ({}()``);
-(x) => ({}().b);
+(a) => ({})().b && 0;
+(a) => (({})().c = 0);
+(x) => ({})()();
+(x) => ({})()``;
+(x) => ({})().b;
 a = (b) => c;
 (x) => (y = z);
 (x) => (y += z);
```

# Output

```js
((a) => {}).length;
typeof (() => {});
export default (() => {})();
(() => {})()``;
(() => {})``;
new (() => {})();
if ((() => {}) ? 1 : 0) {
}
let f = () => ({})();
let a = () => ({}) instanceof a;
a = () => ({}) && a;
a = () => ({})() && a;
a = () => ({}) && a && b;
a = () => ({}) + a;
a = () => ({})()() && a;
a = () => ({}).b && a;
a = () => ({})[b] && a;
a = () => ({})`` && a;
a = () => ({} = 0);
a = () => (({}), a);
(a) => a instanceof {};
(a) => ({})().b && 0;
(a) => (({})().c = 0);
(x) => ({})()();
(x) => ({})()``;
(x) => ({})().b;
a = (b) => c;
(x) => (y = z);
(x) => (y += z);
f((a) => ({})) + 1;
((a) => ({})) || 0;
a = (b) => c;
a = (b) => {
  return c;
};
```