noSparseArray (since v0.7.0)

This rule is recommended by Rome.

Disallow sparse arrays

Examples

Invalid

[1,,2]

suspicious/noSparseArray.js:1:1 lint/suspicious/noSparseArray  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ This array contains an empty slot.
  
  > 1 │ [1,,2]
      │ ^^^^^^
    2 │ 
  
  ℹ Suggested fix: Replace hole with undefined
  
    1 │ [1,·undefined,2]
      │    ++++++++++