Valid `this` in server actions

[maciej-ka]

Link to the code that reproduces this issue

https://github.com/maciej-ka/next-server-action-valid-this

To Reproduce

1. npm run dev
2. visit

Current vs. Expected behavior

Current

Expected

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.1.0: Thu Oct 10 21:03:15 PDT 2024; root:xnu-11215.41.3~2/RELEASE_ARM64_T6000
  Available memory (MB): 65536
  Available CPU cores: 10
Binaries:
  Node: 22.9.0
  npm: 10.8.3
  Yarn: 1.22.17
  pnpm: 9.15.0
Relevant Packages:
  next: 15.0.4 // There is a newer version (15.1.2) available, upgrade recommended!
  eslint-config-next: 15.1.2
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.7.2
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Not sure

Which stage(s) are affected? (Select all that apply)

next dev (local), next build (local), next start (local), Vercel (Deployed), Other (Deployed)

Additional context

Debug

When debugging on Next.js version before forbidding this
(available on branch of reproduction repo)

export const createItem = async () => {
  return new Promise<number>((resolve, reject) => {
    console.dir(this);
    db.run('INSERT INTO items (title) VALUES (?)', ["foo"], function(err) {
      if (err) reject(err)
      console.dir(this);
      resolve(this.lastID)
    })
  });
};

Results are

Motivation

While the first case could be forbidden,
second case, where this is a Statement should be allowed.

Links

Forbidden this introduced in: #73059
Ticket created from discussion: #74124
Solution PR by changing a function visitor: #74179