Skip to content
Biome
Docs Blog Playground

noOctalEscape

Diagnostic Category: lint/nursery/noOctalEscape

Since: v1.9.3

Sources:

Disallow octal escape sequences in string literals

As of the ECMAScript 5 specification, octal escape sequences in string literals are deprecated and should not be used. Unicode escape sequences should be used instead.

Examples

Section titled Examples

Invalid

Section titled Invalid
var foo = "Copyright \251";
code-block.js:1:11 lint/nursery/noOctalEscape ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Don’t use octal
  
  > 1 │ var foo = “Copyright \251”;
      │           ^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Don’t use octal escape sequences: “Copyright \251”
  
  ℹ Use unicode or hexidecimal escape sequences instead.

Valid

Section titled Valid
var foo = "Copyright \u00A9";   // unicode


var foo = "Copyright \xA9";     // hexadecimal
Section titled Related links