public static fields without initializer are removed even with `useDefineForClassFields=true`

[sapphi-red]

🔎 Search Terms

static class field, useDefineForClassFields

🕗 Version & Regression Information

This bug exists at least with v3.7.5 and v5.8.3.

⏯ Playground Link

https://www.typescriptlang.org/play/?useDefineForClassFields=true&jsx=0&ts=5.8.3#code/MYGwhgzhAEBiD29oG8BQ1oQC5iwS2GgDNEAuaAVwDsATAUyLyrpoG5V1ph4rsAnCsCzw+ACgCUKThm694IOgDoQ8AOaiA5CXgboTOInGcAvqlPMA7gfgTUQA

💻 Code

class Foo {
  static foo: undefined;

  constructor() {
    console.log('foo' in Foo)
  }
}
new Foo()

🙁 Actual behavior

console.log('foo' in Foo) outputs false after transformed.

🙂 Expected behavior

console.log('foo' in Foo) to output true after transformed. Because removing : undefined from the input and running that outputs true.

Additional information about the issue

esbuild, babel, SWC transforms correctly (esbuild try, babel repl, SWC playground)

Private static fields works fine (TS playground).