How to reliably find a path to dynamically linked binary?

[n-berilov]

For https://github.com/ajrcarey/pdfium-render library I need to dynamically link a binary.

While this works locally, when package is published at npm and later installed - path becomes incorrect:

// resolved incorrect path when used as node package
/home/me/xxx/api/apps/api/pdfium-linux-x64/lib/libpdfium.so

// correct path
/home/me/xxx/api/apps/api/node_modules/@pkg-prefix/pkg-name/pdfium-linux-x64/lib/libpdfium.so

Code example (binary located in root folder)

  let pdfium_platform_library_folder = if env::consts::OS == "macos" {
    "pdfium-mac-x64/lib"
  } else {
    "pdfium-linux-x64/lib"
  };
  let pdfium_platform_library_path = env::current_dir()
    .unwrap()
    .join(pdfium_platform_library_folder);