SWC incorrectly handles double backslashes in template literals

[ayanamists]

Describe the bug

I encountered an issue with SWC when compiling code that contains strings with double backslashes. It seems this problem only occurs when "target": "es2018" is set and compress is enabled. This problem will cause components as react-katex or other web latex library output weird results.

It seems this problem dose not occur in v1.3.1, and occurs in v.1.5.3 and above.

Input code

export function _jsx(a, b) {
    return b;
}

export const a = _jsx("math", `P \\vdash q`)
export const b = _jsx("math", "P \\vdash q")

Config

{
 // Enable minification
 "minify": true,
 // Optional, configure minification options
 "jsc": {
 "minify": {
 "compress": {
 "unused": true
 },
 "mangle": true
 },
 "target": "es2018"
 }
}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.5.3&code=H4sIAAAAAAAAA13K0QpAMBQG4PvzFH%2B7svIG8g4eQLHNhLKxnUnJu1Nu8F1%2Fdl98YPTJGR69QzPFPVM5tMRBuAXLKTjogk4i%2B2zjXWQolE8Xs%2BJB5Ggr1PXWqThgbeU3638Wrywk0QXDQon6iQAAAA%3D%3D&config=H4sIAAAAAAAAA41VwW7bMAy99ysCn3dodyiKfcBu%2BwZBsShHmSwaIpUmKPLvo2U7TRva2CWI%2BfRIkXykPp52u%2BZIbfNr9yF%2F5WOwmSDfvsVCl8T2LJYG2t5Sm8PAzY8FPdIIeRsJquk6IQ3b3AFXFv18fnmbGU1EJFgYs60PKfjLfcwW%2ByED0Z1NrOKy9JCYvvJnLOP7CHAu9%2FY9YgSbNhBjyYTE0EHWHLcYox0IzMlmxct4U5sDoRZiBAuDM0PGQcWTCxwwScxH1IF1pkUHChQytBxOoNEkltASSXpKPhV2sC9dV%2Fv8jQ0nG4tlJSaca0vktorXAwZi40vSSjiBKzWYwLm435nBmwxccnrkHTGklZ78BZAKREuUbA%2Ba33rCi57W2H6TGZIXyfJFwUXfWpYJOimqCcErlR0rA5mD1s0MrrQwVrbVrjPDK%2BWj4MCA96IVxTW9B24PWlC%2BDIBeAaS%2F1muqmgBzm8IVfByIDfi3ZMm6wOYTveXDOkqXfo9xI0APfEC3cUBawbgOZ9kS52EdL8mBSAOceqRQBR6XgAwAo4l1Xz5oQ8ZDPJou4v5zTcwHrrc93NvU1Xm%2F25eMQ4QTxDUZ%2F8eIbKJyt9Oo6mWyH6YX3jRRWhm88PL85dmQVJ6W35pU06MrdwlVTU7PyWvzeWh5OZaqNYH%2BLMTJdv0H%2FO0MreQGAAA%3D

SWC Info output

Operating System:
      Platform: linux
      Arch: x64
      Machine Type: x86_64
      Version: #29~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Apr  4 14:39:20 UTC 2
      CPU: (12 cores)
          Models: AMD Ryzen 5 3600 6-Core Processor

  Binaries:
      Node: 18.18.0
      npm: 9.8.1
      Yarn: 1.22.19
      pnpm: N/A

  Relevant Packages:
      @swc/core: 1.5.3
      @swc/helpers: N/A
      @swc/types: 0.1.6
      

  SWC Config:
      output: N/A
      .swcrc path: N/A

  Next.js info:
      output: N/A

Expected behavior

The output should be

export function _jsx(t,s){return s}export const a=_jsx("math","P \\vdash q");export const b=_jsx("math","P \\vdash q");

Actual behavior

The output is

export function _jsx(t,s){return s}export const a=_jsx("math","P \\\vdash q");export const b=_jsx("math","P \\vdash q");

Note the \\\vdash here, this is incorrect.

Version

1.5.3

Additional context

No response

[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.