---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: invalid.js
---
# Input
```jsx
try { } catch (e) { e; e = 10; }
try {

} catch (error) {
  error = 100;
  {
    error = 10;
  }
}
```

# Diagnostics
```
invalid.js:1:24 lint/suspicious/noCatchAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Reassigning a catch parameter is confusing.
  
  > 1 │ try { } catch (e) { e; e = 10; }
      │                        ^
    2 │ try {
    3 │ 
  
  i The catch parameter is declared here:
  
  > 1 │ try { } catch (e) { e; e = 10; }
      │                ^
    2 │ try {
    3 │ 
  
  i Use a local variable instead.
  

```

```
invalid.js:5:3 lint/suspicious/noCatchAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Reassigning a catch parameter is confusing.
  
    4 │ } catch (error) {
  > 5 │   error = 100;
      │   ^^^^^
    6 │   {
    7 │     error = 10;
  
  i The catch parameter is declared here:
  
    2 │ try {
    3 │ 
  > 4 │ } catch (error) {
      │          ^^^^^
    5 │   error = 100;
    6 │   {
  
  i Use a local variable instead.
  

```

```
invalid.js:7:5 lint/suspicious/noCatchAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Reassigning a catch parameter is confusing.
  
    5 │   error = 100;
    6 │   {
  > 7 │     error = 10;
      │     ^^^^^
    8 │   }
    9 │ }
  
  i The catch parameter is declared here:
  
    2 │ try {
    3 │ 
  > 4 │ } catch (error) {
      │          ^^^^^
    5 │   error = 100;
    6 │   {
  
  i Use a local variable instead.
  

```