#no-nonoctal-decimal-escape

#Configuration

import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-nonoctal-decimal-escape': 'error',
    },
  },
]);

#Rule Details

Disallows \8 and \9 escape sequences in string literals.

Although "\8" and "\9" evaluate to the same characters as "8" and "9", they are non-octal decimal escape sequences kept only for backward compatibility with web JavaScript. Browsers must support them, but Annex B explicitly allows non-web environments to omit them. The recommended fix is to drop the leading backslash, switch the digit to its \uXXXX form, or — when the goal really is to include a backslash — escape the backslash itself.

Examples of incorrect code for this rule:

"\8";
"\9";
const foo = "w\8less";
const bar = "December 1\9";
const baz = "Don't use \8 and \9 escapes.";
const quux = "\0\8";

Examples of correct code for this rule:

"8";
"9";
const foo = "w8less";
const bar = "December 19";
const baz = "Don't use \\8 and \\9 escapes.";
const quux = "\0\u0038";

#Options

This rule has no options.

#Original Documentation

• ESLint no-nonoctal-decimal-escape