noEmptyPattern

JavaScript (and super languages)

Summary

• Rule available since: v1.0.0
• Diagnostic Category: lint/correctness/noEmptyPattern
• This rule is recommended, which means is enabled by default.
• This rule doesn’t have a fix.
• The default severity of this rule is error.
• Sources:
  • Same as no-empty-pattern

How to configure

biome.json

{
  "linter": {
    "rules": {
      "correctness": {
        "noEmptyPattern": "error"
      }
    }
  }
}

Description

Disallows empty destructuring patterns.

Examples

Invalid

var {} = foo;

code-block.js:1:5 lint/correctness/noEmptyPattern ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected empty object pattern.
  
  > 1 │ var {} = foo;
      │     ^^
    2 │ 
  

var {a: {}} = foo;

code-block.js:1:9 lint/correctness/noEmptyPattern ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected empty object pattern.
  
  > 1 │ var {a: {}} = foo;
      │         ^^
    2 │ 
  

function foo({}) {}

code-block.js:1:14 lint/correctness/noEmptyPattern ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected empty object pattern.
  
  > 1 │ function foo({}) {}
      │              ^^
    2 │ 
  

Valid

The following cases are valid because they create new bindings.

var {a = {}} = foo;
var {a, b = {}} = foo;
var {a = []} = foo;
function foo({a = {}}) {}
function foo({a = []}) {}
var [a] = foo;

Related links

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• Source Code
• Test Cases