---
source: crates/rome_formatter_test/src/snapshot_builder.rs
info:
  test_file: js/objects/expression.js
---

# Input

```js
() => ({}``);
({})``;
a = () => ({}).x;
({} && a, b);
({}::b, 0);
({}::b()``[''].c++ && 0 ? 0 : 0, 0);
({}(), 0);
({} = 0);
(({} = 0), 1);

const a1 = {
  someKey:
    (shortName, shortName)
};

const a2 = {
  someKey:
    (longLongLongLongLongLongLongLongLongLongLongLongLongLongName, shortName)
};

const a3 = {
  someKey:
    (longLongLongLongLongLongLongLongLongLongLongLongLongLongName, longLongLongLongLongLongLongLongLongLongLongLongLongLongName, longLongLongLongLongLongLongLongLongLongLongLongLongLongName)
};

```


# Prettier differences

```diff
--- Prettier
+++ Rome
@@ -1,10 +1,12 @@
-() => ({}``);
-({}``);
-a = () => ({}.x);
-({} && a, b);
-({}::b, 0);
-({}::b()``[""].c++ && 0 ? 0 : 0, 0);
-({}(), 0);
+() => ({})``;
+({})``;
+a = () => ({}).x;
+({}) && a, b;
+({}
+::b, 0)
+({}
+::b()``[''].c++ && 0 ? 0 : 0, 0)
+({})(), 0;
 ({} = 0);
 ({} = 0), 1;
 
```

# Output

```js
() => ({})``;
({})``;
a = () => ({}).x;
({}) && a, b;
({}
::b, 0)
({}
::b()``[''].c++ && 0 ? 0 : 0, 0)
({})(), 0;
({} = 0);
({} = 0), 1;

const a1 = {
  someKey: (shortName, shortName),
};

const a2 = {
  someKey:
    (longLongLongLongLongLongLongLongLongLongLongLongLongLongName, shortName),
};

const a3 = {
  someKey:
    (longLongLongLongLongLongLongLongLongLongLongLongLongLongName,
    longLongLongLongLongLongLongLongLongLongLongLongLongLongName,
    longLongLongLongLongLongLongLongLongLongLongLongLongLongName),
};
```

# Errors
```
expression.js:5:4 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `)` but instead found `:`
  
    3 │ a = () => ({}).x;
    4 │ ({} && a, b);
  > 5 │ ({}::b, 0);
      │    ^
    6 │ ({}::b()``[''].c++ && 0 ? 0 : 0, 0);
    7 │ ({}(), 0);
  
  i Remove :
  
expression.js:6:4 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `)` but instead found `:`
  
    4 │ ({} && a, b);
    5 │ ({}::b, 0);
  > 6 │ ({}::b()``[''].c++ && 0 ? 0 : 0, 0);
      │    ^
    7 │ ({}(), 0);
    8 │ ({} = 0);
  
  i Remove :
  

```