🐛 Bug: Escape handling is not correct

[tvogel]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

This should twice show the same string:

import dedent from "dedent"

console.log(dedent`
  This is broken:
  \\\$`);

console.log(`This is correct:
\\\$`);

Actual

It shows:

This is broken:
\\$
This is correct:
\$

Additional Info

See also: https://playcode.io/2050574

[JoshuaKGoldberg]

Fun. This is the case in all dedent string versions I've tried, including the latest (1.5.3), 1.0.0, 0.6.0, and 0.1.0.

Digging into how the the tagged templates work internally:

const tagger = (strings) => strings;

console.log(tagger`From tagger:
\\\$`);

[ 'From tagger:\n\\$' ]

Seems like a bug in escapeSpecialCharacters. cc @G-Rath, what do you think?

[G-Rath]

isn't this what #69 is about? dedent is escaping the $ automatically even though it doesn't need to

[JoshuaKGoldberg]

👍 Fair. Since this issue has the cleaner repro, I'll mark that one as a duplicate of this. Thanks!

[alumni]

Another example, given:

const dedent = require('dedent');
const dedent2 = dedent.withOptions({ escapeSpecialCharacters: false });

I'm expecting at least one of the following to return true:

dedent`'\\n'` === `'\\n'`;
dedent2`'\\n'` === `'\\n'`;

Instead, I get:

dedent`'\\n'` === `'\\\n'`;
dedent2`'\\n'` === `'\\\\n'`;

Possibly related to #90