noMisrefactoredShorthandAssign

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JavaScript (and super languages)

Summary

Rule available since: v1.3.0
Diagnostic Category: lint/suspicious/noMisrefactoredShorthandAssign
This rule is recommended, which means is enabled by default.
This rule has an unsafe fix.
The default severity of this rule is error.
Sources:
- Same as misrefactored_assign_op

Description

Disallow shorthand assign when variable appears on both sides.

This rule helps to avoid potential bugs related to incorrect assignments or unintended side effects that may occur during refactoring.

Examples

Invalid

1
a += a + b

code-block.js:1:1 lint/suspicious/noMisrefactoredShorthandAssign  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Variable appears on both sides of an assignment operation.
  
  > 1 │ a += a + b
      │ ^^^^^^^^^^
    2 │ 
  
  ℹ This assignment might be the result of a wrong refactoring.
  
  ℹ Unsafe fix: Use a += b instead.
  
    1 │ a·+=·a·+·b
      │      ----

1
a -= a - b

code-block.js:1:1 lint/suspicious/noMisrefactoredShorthandAssign  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Variable appears on both sides of an assignment operation.
  
  > 1 │ a -= a - b
      │ ^^^^^^^^^^
    2 │ 
  
  ℹ This assignment might be the result of a wrong refactoring.
  
  ℹ Unsafe fix: Use a -= b instead.
  
    1 │ a·-=·a·-·b
      │      ----

1
a *= a * b

code-block.js:1:1 lint/suspicious/noMisrefactoredShorthandAssign  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Variable appears on both sides of an assignment operation.
  
  > 1 │ a *= a * b
      │ ^^^^^^^^^^
    2 │ 
  
  ℹ This assignment might be the result of a wrong refactoring.
  
  ℹ Unsafe fix: Use a *= b instead.
  
    1 │ a·*=·a·*·b
      │      ----

Valid

1
a += b

1
a = a + b

1
a = a - b

How to configure

1
{
2
  "linter": {
3
    "rules": {
4
      "suspicious": {
5
        "noMisrefactoredShorthandAssign": "error"
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      }
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    }
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  }
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}