useSimpleNumberKeys

JavaScript (and super languages)

Summary

• Rule available since: v1.0.0
• Diagnostic Category: lint/complexity/useSimpleNumberKeys
• This rule is recommended, which means is enabled by default.
• This rule has a safe fix.
• The default severity of this rule is warning.

How to configure

biome.json

{
  "linter": {
    "rules": {
      "complexity": {
        "useSimpleNumberKeys": "error"
      }
    }
  }
}

Description

Disallow number literal object member names which are not base 10 or use underscore as separator.

Examples

Invalid

({ 0x1: 1 });

code-block.js:1:4 lint/complexity/useSimpleNumberKeys  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Hexadecimal number literal is not allowed here.
  
  > 1 │ ({ 0x1: 1 });
      │    ^^^
    2 │ 
  
  ℹ Safe fix: Replace 0x1 with 1
  
    1   │ - ({·0x1:·1·});
      1 │ + ({·1:·1·});
    2 2 │   
  

({ 11_1.11: "ee" });

code-block.js:1:4 lint/complexity/useSimpleNumberKeys  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Number literal with underscore is not allowed here.
  
  > 1 │ ({ 11_1.11: “ee” });
      │    ^^^^^^^
    2 │ 
  
  ℹ Safe fix: Replace 11_1.11 with 111.11
  
    1   │ - ({·11_1.11:·“ee”·});
      1 │ + ({·111.11:·“ee”·});
    2 2 │   
  

({ 0o1: 1 });

code-block.js:1:4 lint/complexity/useSimpleNumberKeys  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Octal number literal is not allowed here.
  
  > 1 │ ({ 0o1: 1 });
      │    ^^^
    2 │ 
  
  ℹ Safe fix: Replace 0o1 with 1
  
    1   │ - ({·0o1:·1·});
      1 │ + ({·1:·1·});
    2 2 │   
  

({ 1n: 1 });

code-block.js:1:4 lint/complexity/useSimpleNumberKeys  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Bigint is not allowed here.
  
  > 1 │ ({ 1n: 1 });
      │    ^^
    2 │ 
  
  ℹ Safe fix: Replace 1n with 1
  
    1   │ - ({·1n:·1·});
      1 │ + ({·1:·1·});
    2 2 │   
  

({ 11_1.11: "ee" });

code-block.js:1:4 lint/complexity/useSimpleNumberKeys  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Number literal with underscore is not allowed here.
  
  > 1 │ ({ 11_1.11: “ee” });
      │    ^^^^^^^
    2 │ 
  
  ℹ Safe fix: Replace 11_1.11 with 111.11
  
    1   │ - ({·11_1.11:·“ee”·});
      1 │ + ({·111.11:·“ee”·});
    2 2 │   
  

Valid

({ 0: "zero" });
({ 122: "integer" });
({ 1.22: "floating point" });
({ 3.1e12: "floating point with e" });

Related links

• Disable a rule
• Configure the code fix
• Rule options
• Source Code
• Test Cases