The string compression output for escape(\) is not as expected

[jigsawye]

Describe the bug

The string compression output for escape(\) is not as expected. This bug was not present in 1.3.97 but started occurring after 1.3.98.

Input code

const a = '\\';
const b = `${a}`;

console.log(b)

Config

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "tsx": false
    },
    "loose": false,
    "minify": {
      "compress": {
        "arguments": false,
        "arrows": true,
        "booleans": true,
        "booleans_as_integers": false,
        "collapse_vars": true,
        "comparisons": true,
        "computed_props": true,
        "conditionals": true,
        "dead_code": true,
        "directives": true,
        "drop_console": false,
        "drop_debugger": true,
        "evaluate": true,
        "expression": false,
        "hoist_funs": false,
        "hoist_props": true,
        "hoist_vars": false,
        "if_return": true,
        "join_vars": true,
        "keep_classnames": false,
        "keep_fargs": true,
        "keep_fnames": false,
        "keep_infinity": false,
        "loops": true,
        "negate_iife": true,
        "properties": true,
        "reduce_funcs": false,
        "reduce_vars": false,
        "side_effects": true,
        "switches": true,
        "typeofs": true,
        "unsafe": false,
        "unsafe_arrows": false,
        "unsafe_comps": false,
        "unsafe_Function": false,
        "unsafe_math": false,
        "unsafe_symbols": false,
        "unsafe_methods": false,
        "unsafe_proto": false,
        "unsafe_regexp": false,
        "unsafe_undefined": false,
        "unused": true,
        "const_to_let": true,
        "pristine_globals": true
      }
    },
    "target": "es2022"
  },
  "module": {
    "type": "es6"
  },
  "minify": false,
  "isModule": true
}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.3.98&code=H4sIAAAAAAAAA0vOzysuUUhUsFVQj4lRt%2BZKBvOTgPwElerE2gRrLrBQfk6qXk5%2BukaSJgBb5y21MQAAAA%3D%3D&config=H4sIAAAAAAAAA32UO3LjMAxA%2B5zCozrFjostcoDtcgYOLYIyshShIUDHmozvvtDHXieG3El4%2BBG%2Fr5fdrvngtnnbfemn%2Fgy%2BMJTbv0p4zOLPKmlkHIDbgoM0r1cqPKHoE8MsuiykSUQMV7LKeswYx3vfLfVDAeY7mUp96WoPWfi7%2FcoKfU5ASr2XH4gS%2BPyEOM8Os0AHxXLcUkp%2BYHAnXwwvU6a%2BIJMVYoJVILih0GDyHFCQssZ8pAF8cC0FMBAWaAVPYJlpLDXLrM8z3jPjAIfadXM%2Ff1jDyafqxYgJ57klmq3h9UjI4mLNVgkXuFGDBa7F%2FWmJ0RWQWvKj3Qdh3ujJXwCtQPLM2fdg%2BZ01os7TlnV8aok56sjKaHCdb%2BuVGTotqkOMRmWnykARtLpZINQWpsq2Vjor3igfYwAHMeqsGK75E6U9WkGnhaZoAO2vj9ZULcDdtnCDTwvxBP%2FRV4o9YKtG7%2BW4TXnsD5SeBOhBjhSeKGgrhLZx0StxHrZ5zQF0NCCYKpVn8HgEdAGEXAKxZkPXQz26LtHh%2F5lYFS7fbqvoQM8%2BGuD9r%2F2%2BeVlZ01Oo8zVYr%2FnU4EXv953S9QzfMm%2BQ36%2BWc9TLP4kAIlsZBgAA

SWC Info output

No response

Expected behavior

console.log("\\");

Actual behavior

console.log("\\\\");

Version

1.3.98

Additional context

After upgrading to Next.js 14.0.4, this bug was discovered.

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.