examples_postinstall removes wrong files

[Phecda]

Circumstance

• node 10.5.0
• npm 6.1.0
• macOS High Sierra (10.13.5)

Description

In example/node_modules/ my library is actually a symbolic link instead of a real copied directory, therefore the script examples_postinstall(#75 ) removes example itself and my library's node_modules.

Workaround

Adding below codes works for me, but not sure for other situation.

if (fs.lstatSync(libraryNodeModulesPath).isSymbolicLink()) {
      console.log('Symbolic link detected. End deleting');
      return;
}