---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: customHook.js
---
# Input
```jsx
import { useEffect } from "react";

function MyComponent() {
    let a = 1;
    useEffect(() => {
        console.log(a);
    }, []);

    useMyEffect(() => {
        console.log(a);
    }, []);

    useMyEffect(() => {
       console.log(a);
    });
}

```

# Diagnostics
```
customHook.js:5:5 lint/correctness/useExhaustiveDependencies ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This hook does not specify all of its dependencies: a
  
    3 │ function MyComponent() {
    4 │     let a = 1;
  > 5 │     useEffect(() => {
      │     ^^^^^^^^^
    6 │         console.log(a);
    7 │     }, []);
  
  i This dependency is not specified in the hook dependency list.
  
    4 │     let a = 1;
    5 │     useEffect(() => {
  > 6 │         console.log(a);
      │                     ^
    7 │     }, []);
    8 │ 
  
  i Either include it or remove the dependency array
  

```

```
customHook.js:9:5 lint/correctness/useExhaustiveDependencies ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! This hook does not specify all of its dependencies: a
  
     7 │     }, []);
     8 │ 
   > 9 │     useMyEffect(() => {
       │     ^^^^^^^^^^^
    10 │         console.log(a);
    11 │     }, []);
  
  i This dependency is not specified in the hook dependency list.
  
     9 │     useMyEffect(() => {
  > 10 │         console.log(a);
       │                     ^
    11 │     }, []);
    12 │ 
  
  i Either include it or remove the dependency array
  

```