---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.js
---
# Input
```jsx
async function fetchData() {
	return fetch('/data');
}

(async function fetchDataImmediate() {
	return fetch('/data');
})();

const obj = {
	async fetchData() {
		return fetch('/data');
	},
};

class DataFetcher {
	async fetchData() {
		return fetch('/data');
	}
}

async function outer() {
	async function innerFetchData() {
		return fetch('/data');
	}
}

async function outer() {
	async function innerFetchData() {
		return fetch('/data');
	}
	return fetch('/another-data');
}

async function outer() {
	async function innerFetchData() {
		return await fetch('/data');
	}
	return fetch('/another-data');
}

async function complexFunction() {
	const obj = {
		async fetchData() {
			return fetch('/data');
		},
	};

	class NestedDataFetcher {
		async fetchData() {
			return fetch('/data');
		}
	}

	if (a === 'a') {
		return fetch('condition-data');
	}
}

async function withoutForAwait () {
	let sum = 0;
	for (const n of [1, 2, 3]) {
		sum += n
	}
	return sum;
};

```

# Diagnostics
```
invalid.js:1:1 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
  > 1 │ async function fetchData() {
      │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 2 │ 	return fetch('/data');
  > 3 │ }
      │ ^
    4 │ 
    5 │ (async function fetchDataImmediate() {
  
  i Remove this async modifier, or add an await expression in the function.
  
  > 1 │ async function fetchData() {
      │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 2 │ 	return fetch('/data');
  > 3 │ }
      │ ^
    4 │ 
    5 │ (async function fetchDataImmediate() {
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:5:2 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    3 │ }
    4 │ 
  > 5 │ (async function fetchDataImmediate() {
      │  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 6 │ 	return fetch('/data');
  > 7 │ })();
      │ ^
    8 │ 
    9 │ const obj = {
  
  i Remove this async modifier, or add an await expression in the function.
  
    3 │ }
    4 │ 
  > 5 │ (async function fetchDataImmediate() {
      │  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 6 │ 	return fetch('/data');
  > 7 │ })();
      │ ^
    8 │ 
    9 │ const obj = {
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:10:2 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
     9 │ const obj = {
  > 10 │ 	async fetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^
  > 11 │ 		return fetch('/data');
  > 12 │ 	},
       │ 	^
    13 │ };
    14 │ 
  
  i Remove this async modifier, or add an await expression in the function.
  
     9 │ const obj = {
  > 10 │ 	async fetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^
  > 11 │ 		return fetch('/data');
  > 12 │ 	},
       │ 	^
    13 │ };
    14 │ 
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:16:2 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    15 │ class DataFetcher {
  > 16 │ 	async fetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^
  > 17 │ 		return fetch('/data');
  > 18 │ 	}
       │ 	^
    19 │ }
    20 │ 
  
  i Remove this async modifier, or add an await expression in the function.
  
    15 │ class DataFetcher {
  > 16 │ 	async fetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^
  > 17 │ 		return fetch('/data');
  > 18 │ 	}
       │ 	^
    19 │ }
    20 │ 
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:22:2 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    21 │ async function outer() {
  > 22 │ 	async function innerFetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 23 │ 		return fetch('/data');
  > 24 │ 	}
       │ 	^
    25 │ }
    26 │ 
  
  i Remove this async modifier, or add an await expression in the function.
  
    21 │ async function outer() {
  > 22 │ 	async function innerFetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 23 │ 		return fetch('/data');
  > 24 │ 	}
       │ 	^
    25 │ }
    26 │ 
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:21:1 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    19 │ }
    20 │ 
  > 21 │ async function outer() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^
  > 22 │ 	async function innerFetchData() {
  > 23 │ 		return fetch('/data');
  > 24 │ 	}
  > 25 │ }
       │ ^
    26 │ 
    27 │ async function outer() {
  
  i Remove this async modifier, or add an await expression in the function.
  
    19 │ }
    20 │ 
  > 21 │ async function outer() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^
  > 22 │ 	async function innerFetchData() {
  > 23 │ 		return fetch('/data');
  > 24 │ 	}
  > 25 │ }
       │ ^
    26 │ 
    27 │ async function outer() {
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:28:2 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    27 │ async function outer() {
  > 28 │ 	async function innerFetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 29 │ 		return fetch('/data');
  > 30 │ 	}
       │ 	^
    31 │ 	return fetch('/another-data');
    32 │ }
  
  i Remove this async modifier, or add an await expression in the function.
  
    27 │ async function outer() {
  > 28 │ 	async function innerFetchData() {
       │ 	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 29 │ 		return fetch('/data');
  > 30 │ 	}
       │ 	^
    31 │ 	return fetch('/another-data');
    32 │ }
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:27:1 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    25 │ }
    26 │ 
  > 27 │ async function outer() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^
  > 28 │ 	async function innerFetchData() {
  > 29 │ 		return fetch('/data');
  > 30 │ 	}
  > 31 │ 	return fetch('/another-data');
  > 32 │ }
       │ ^
    33 │ 
    34 │ async function outer() {
  
  i Remove this async modifier, or add an await expression in the function.
  
    25 │ }
    26 │ 
  > 27 │ async function outer() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^
  > 28 │ 	async function innerFetchData() {
  > 29 │ 		return fetch('/data');
  > 30 │ 	}
  > 31 │ 	return fetch('/another-data');
  > 32 │ }
       │ ^
    33 │ 
    34 │ async function outer() {
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:34:1 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    32 │ }
    33 │ 
  > 34 │ async function outer() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^
  > 35 │ 	async function innerFetchData() {
  > 36 │ 		return await fetch('/data');
  > 37 │ 	}
  > 38 │ 	return fetch('/another-data');
  > 39 │ }
       │ ^
    40 │ 
    41 │ async function complexFunction() {
  
  i Remove this async modifier, or add an await expression in the function.
  
    32 │ }
    33 │ 
  > 34 │ async function outer() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^
  > 35 │ 	async function innerFetchData() {
  > 36 │ 		return await fetch('/data');
  > 37 │ 	}
  > 38 │ 	return fetch('/another-data');
  > 39 │ }
       │ ^
    40 │ 
    41 │ async function complexFunction() {
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:43:3 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    41 │ async function complexFunction() {
    42 │ 	const obj = {
  > 43 │ 		async fetchData() {
       │ 		^^^^^^^^^^^^^^^^^^^
  > 44 │ 			return fetch('/data');
  > 45 │ 		},
       │ 		^
    46 │ 	};
    47 │ 
  
  i Remove this async modifier, or add an await expression in the function.
  
    41 │ async function complexFunction() {
    42 │ 	const obj = {
  > 43 │ 		async fetchData() {
       │ 		^^^^^^^^^^^^^^^^^^^
  > 44 │ 			return fetch('/data');
  > 45 │ 		},
       │ 		^
    46 │ 	};
    47 │ 
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:49:3 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    48 │ 	class NestedDataFetcher {
  > 49 │ 		async fetchData() {
       │ 		^^^^^^^^^^^^^^^^^^^
  > 50 │ 			return fetch('/data');
  > 51 │ 		}
       │ 		^
    52 │ 	}
    53 │ 
  
  i Remove this async modifier, or add an await expression in the function.
  
    48 │ 	class NestedDataFetcher {
  > 49 │ 		async fetchData() {
       │ 		^^^^^^^^^^^^^^^^^^^
  > 50 │ 			return fetch('/data');
  > 51 │ 		}
       │ 		^
    52 │ 	}
    53 │ 
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:41:1 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    39 │ }
    40 │ 
  > 41 │ async function complexFunction() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 42 │ 	const obj = {
        ...
  > 56 │ 	}
  > 57 │ }
       │ ^
    58 │ 
    59 │ async function withoutForAwait () {
  
  i Remove this async modifier, or add an await expression in the function.
  
    39 │ }
    40 │ 
  > 41 │ async function complexFunction() {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 42 │ 	const obj = {
        ...
  > 56 │ 	}
  > 57 │ }
       │ ^
    58 │ 
    59 │ async function withoutForAwait () {
  
  i Async functions without await expressions may not need to be declared async.
  

```

```
invalid.js:59:1 lint/suspicious/useAwait ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This async function lacks an await expression.
  
    57 │ }
    58 │ 
  > 59 │ async function withoutForAwait () {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 60 │ 	let sum = 0;
  > 61 │ 	for (const n of [1, 2, 3]) {
  > 62 │ 		sum += n
  > 63 │ 	}
  > 64 │ 	return sum;
  > 65 │ };
       │ ^
    66 │ 
  
  i Remove this async modifier, or add an await expression in the function.
  
    57 │ }
    58 │ 
  > 59 │ async function withoutForAwait () {
       │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 60 │ 	let sum = 0;
  > 61 │ 	for (const n of [1, 2, 3]) {
  > 62 │ 		sum += n
  > 63 │ 	}
  > 64 │ 	return sum;
  > 65 │ };
       │ ^
    66 │ 
  
  i Async functions without await expressions may not need to be declared async.
  

```