Check file annotation before deleting the index.ts

[Ben Who]

barrelsby/src/purge.ts

Lines 17 to 23 in 103a1cd

 .forEach((file: FileTreeLocation) => { 
   logger.debug(`Deleting existing barrel @ ${file.path}`); 
   // Delete barrel file and clean up tree model. 
   fs.unlinkSync(file.path); 
   directory.files.splice(directory.files.indexOf(file), 1); 
   directory.barrel = undefined; 
 }); 

Currently, the -d option will delete the index.ts before generating a new one, however, it could delete the user's files that were not created by the barrelsby.

I recommend adding another filter to check if the file that is going to be deleted has the @file Automatically generated by barrelsby. annotation.

//..skip
directory.files
 .filter((file) => {
    const isGenerated = fs.readFileSync(file.path).includes('@file Automatically generated by barrelsby.');
    return file.name === barrelName && isGenerated;
  })