no-nonoctal-decimal-escape.md

Pattern: Legacy escape sequence in string

Issue: -

Description

The escape sequences \8 and \9 in string literals are legacy features that produce different results in different JavaScript engines. These sequences should be avoided in favor of literal digits or proper escape sequences.

Examples

Example of incorrect code:

const str1 = "Some text \8";
const str2 = "\9 is invalid";
const regex = /\8/;
const str3 = `Template with \8 escape`;

Example of correct code:

const str1 = "Some text 8";
const str2 = "9 is invalid";
const str3 = "Use \\8 for backslash eight";
const regex = /8/;
const str4 = `Template with 8`;