pdfjs-dist fails to compile with Turbopack (webpackIgnore comment not respected)

[timneutkens]

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/pdf-viewer-forked-h3gdsc?file=%2Fcomponents%2FTestPage.tsx

To Reproduce

1. Open https://codesandbox.io/p/devbox/pdf-viewer-forked-h3gdsc?file=%2Fcomponents%2FTestPage.tsx
2. Observe the compilation failing with Module not found (example: https://h3gdsc-3000.csb.app/)

Current vs. Expected behavior

pdfjs-dist ships with a webpack specific ignore comment (:til: that is a feature) as they use import() to load a file based on an option being passed in.

Specifically const worker = await import(/* webpackIgnore: true */ this.workerSrc); fails to compile as it can't find this.workerSrc statically.

I'm not sure what the best behavior is for this, adding support for the comment or ignoring such imports when they don't include a path.

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Sun Aug  6 20:05:33 UTC 2023
  Available memory (MB): 4102
  Available CPU cores: 2
Binaries:
  Node: 20.12.0
  npm: 10.5.0
  Yarn: 1.22.19
  pnpm: 8.15.6
Relevant Packages:
  next: 14.3.0-canary.40 // Latest available version is detected (14.3.0-canary.40).
  eslint-config-next: 14.1.0
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.3.3
Next.js Config:
  output: N/A

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

Turbopack

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

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

Additional context

This is failing on all versions with Turbopack as it doesn't support the ignore comment.

_PACK-3046

[timneutkens]

This issue came out of #63385 (comment)