---
source: crates/biome_formatter_test/src/snapshot_builder.rs
info: js/binary-expressions/tuple-and-record.js
---

# Input

```js
foo = foo || [
  // comment
  a,
]

foo = foo || #[
  // comment
  a,
]

foo = foo || {
  // comment
  a,
}

foo = foo || #{
  // comment
  a,
}

```


# Prettier differences

```diff
--- Prettier
+++ Biome
@@ -3,7 +3,8 @@
   a,
 ];
 
-foo = foo || #[
+foo = foo || #;
+[
   // comment
   a,
 ];
@@ -13,7 +14,8 @@
   a,
 };
 
-foo = foo || #{
+foo = foo || #;
+{
   // comment
   a,
-};
+}
```

# Output

```js
foo = foo || [
  // comment
  a,
];

foo = foo || #;
[
  // comment
  a,
];

foo = foo || {
  // comment
  a,
};

foo = foo || #;
{
  // comment
  a,
}
```

# Errors
```
tuple-and-record.js:6:15 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected an identifier but instead found '['.
  
    4 │ ]
    5 │ 
  > 6 │ foo = foo || #[
      │               ^
    7 │   // comment
    8 │   a,
  
  i Expected an identifier here.
  
    4 │ ]
    5 │ 
  > 6 │ foo = foo || #[
      │               ^
    7 │   // comment
    8 │   a,
  
tuple-and-record.js:6:14 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Private names are only allowed on the left side of a 'in' expression
  
    4 │ ]
    5 │ 
  > 6 │ foo = foo || #[
      │              ^
    7 │   // comment
    8 │   a,
  
tuple-and-record.js:6:15 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected a semicolon or an implicit semicolon after a statement, but found none
  
    4 │ ]
    5 │ 
  > 6 │ foo = foo || #[
      │               ^
    7 │   // comment
    8 │   a,
  
  i An explicit or implicit semicolon is expected here...
  
    4 │ ]
    5 │ 
  > 6 │ foo = foo || #[
      │               ^
    7 │   // comment
    8 │   a,
  
  i ...Which is required to end this statement
  
    4 │ ]
    5 │ 
  > 6 │ foo = foo || #[
      │ ^^^^^^^^^^^^^^^
    7 │   // comment
    8 │   a,
  
tuple-and-record.js:16:15 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected an identifier but instead found '{'.
  
    14 │ }
    15 │ 
  > 16 │ foo = foo || #{
       │               ^
    17 │   // comment
    18 │   a,
  
  i Expected an identifier here.
  
    14 │ }
    15 │ 
  > 16 │ foo = foo || #{
       │               ^
    17 │   // comment
    18 │   a,
  
tuple-and-record.js:16:14 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Private names are only allowed on the left side of a 'in' expression
  
    14 │ }
    15 │ 
  > 16 │ foo = foo || #{
       │              ^
    17 │   // comment
    18 │   a,
  
tuple-and-record.js:16:15 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected a semicolon or an implicit semicolon after a statement, but found none
  
    14 │ }
    15 │ 
  > 16 │ foo = foo || #{
       │               ^
    17 │   // comment
    18 │   a,
  
  i An explicit or implicit semicolon is expected here...
  
    14 │ }
    15 │ 
  > 16 │ foo = foo || #{
       │               ^
    17 │   // comment
    18 │   a,
  
  i ...Which is required to end this statement
  
    14 │ }
    15 │ 
  > 16 │ foo = foo || #{
       │ ^^^^^^^^^^^^^^^
    17 │   // comment
    18 │   a,
  
tuple-and-record.js:19:1 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected an expression but instead found '}'.
  
    17 │   // comment
    18 │   a,
  > 19 │ }
       │ ^
    20 │ 
  
  i Expected an expression here.
  
    17 │   // comment
    18 │   a,
  > 19 │ }
       │ ^
    20 │ 
  

```