Some terser options does not work with TypeScript, including mangle.properties.regex

[cheuksing]

Describe the bug

Some terser options does not work with TypeScript.

Expected: Typescripts class member with name starting with /^_/ to be mangled after build.
Actual: Nothing is mangled.

Minimal Settings. For reproduction please refers to the reproducing repository.

// vite.config.ts
build: {
    minify: 'terser',
    terserOptions: {
      mangle: {
        toplevel: true,
        module: true,
        properties: {
           regex: /^_/
         }
       },
       compress: {
        drop_console: true,
        drop_debugger: true,
       }
    }
}

Reproduction

https://github.com/cheuksing/vite-terser-issue-demo

Steps to reproduce

Run yarn followed by yarn build.
See the build result in dist.

System Info

System:
    OS: Windows 10 10.0.22000
    CPU: (12) x64 11th Gen Intel(R) Core(TM) i5-11600 @ 2.80GHz
    Memory: 3.40 GB / 15.87 GB
  Binaries:
    Node: 16.17.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.19 - C:\Program Files\nodejs\yarn.CMD
    npm: 8.15.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.22000.120.0), Chromium (107.0.1418.62)
    Internet Explorer: 11.0.22000.120
  npmPackages:
    vite: latest => 3.2.5

Used Package Manager

yarn

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[CT-LX]

I have the same problem,when i use uni-app

[patak-dev]

This works if you define build.target: 'es2022', so esbuild won't use a helper to support instance class fields.
The ES build would not be mangled/minified though, there is another issue tracking this #6555