noCatchAssign

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JavaScript (and super languages)

Summary

Rule available since: v1.0.0
Diagnostic Category: lint/suspicious/noCatchAssign
This rule is recommended, which means is enabled by default.
This rule doesn’t have a fix.
The default severity of this rule is warning.
Sources:
- Same as no-ex-assign

How to configure

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{
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  "linter": {
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    "rules": {
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      "suspicious": {
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        "noCatchAssign": "error"
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      }
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    }
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  }
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}

Description

Disallow reassigning exceptions in catch clauses.

Assignment to a catch parameter can be misleading and confusing. It is often unintended and indicative of a programmer error.

Examples

Invalid

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try {
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} catch (e) {
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  e;
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  e = 10;
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}

code-block.js:5:3 lint/suspicious/noCatchAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

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

Valid

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try {
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} catch (e) {
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  let e = 10;
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  e = 100;
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}