no-invalid-escape-sequences.md

Disallows invalid escape sequences in template strings (no-invalid-escape-sequences)

Some escape sequences are invalid inside template strings and will cause a parse error or similar.

An example is if we were to template octal:

html`an octal escape sequence: \123`;

This should instead be escaped twice to ensure it remains intact:

html`an octal escape sequence: \\123`;

Alternatively, if you did mean to insert the value as is, you should likely use hex or unicode instead: \xFF.

Rule Details

This rule disallows invalid escape sequences in templates.

The following patterns are considered warnings:

html`foo \2c bar`; // because \2 is octal
html`foo \123 bar`; // because \1 is octal
html`foo \0123`;

The following patterns are not warnings:

html`foo \\2c bar`;
html`foo \xFF bar`;
html`foo \u0002 bar`;

When Not To Use It

If you don't care about invalid escape sequences, then you will not need this rule.