TS4094 error occurred, even if the parent has a protected member (declaration: true)

[karikera]

Bug Report

• Similar issue: Unexpected TS4094 with the build parameter declaration: true #17293

🔎 Search Terms

ts4094 parent
ts4094 extends

🕗 Version & Regression Information

4.6.0-dev.20211218

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________

⏯ Playground Link

[Playground link with relevant code]

• The playground doesn't show this error. it needs "declaration": true

💻 Code

class Foo {
    protected a = 0;
}
const a = new class extends Foo {};

🙁 Actual behavior

ts4094, Property 'a' of exported class expression may not be private or protected.ts(4094)

🙂 Expected behavior

no error.
'a' can be accessed by the other child classes.

[MartinJohns]

The playground doesn't show this error. it needs "declaration": true

It does, when you add // @declaration: true.

[MartinJohns]

I don't see any difference to #17293.

[fatcerberus]

I believe this could be fixed if #41587 were implemented. Right now it looks like a design limitation, as explained in #17293.

[karikera]

I don't see any difference to #17293.

I felt it little different but it seems almost same.