file-janitor

Keep the public directory of your front-end assets clean (to be used after webpack or similar tools).

Usage example:

const FileJanitor = require('file-janitor');

FileJanitor.clean({
    source: ['/path1/*.js', '/path2/*.css'],  // string patterns for glob 
    destination: '/public',   // must be a directory, will be created if it doesn't exists
    separator: '-',  // default is '.',
    deleteOld: true  // default is false
});

The clean method will copy all files that match the patterns given in the source option to the directory given in destination.

The source files are expected have have a name with a hash, like app.53e25327dcbe3560d7b6.js (or app-53e25327dcbe3560d7b6.js, if the separator is '-' instead of '.'). This is the usual format of the chunks produced by webpack and related tools. If deleteOld is true, all files in the destination directory with the same prefix will be deleted (except files matched by source).

If destination already has a file with the same name, it will remain untouched.

Concrete example

Suppose the destination directory looks like this:

/public/app.123.js
/public/lib.456.js
/public/app.789.css

After webpack is executed we have a bunch of new files:

/path1/app.321.js
/path1/lib.456.js
/path2/app.987.css

After calling

FileJanitor.clean({
    source: ['/path1/*.js', '/path2/*.css'],
    destination: '/public', 
    deleteOld: true
});

the new files will be copied to the destination directory and the old files will be deleted. That is:

• /path1/app.321.js will be copied to /public
• /public/app.123.js will be deleted
• /path1/lib.456.js will NOT be copied to /public
• /public/lib.456.js will remain untouched
• /path1/app.987.css will be copied to /public
• /public/app.789.css will be deleted

That is, the destination directory will now be:

/public/app.321.js    <-- new file
/public/lib.456.js    <-- same file, was not touched
/public/app.987.css   <-- new file

IMPORTANT NOTE: we assume files are 'new' and 'old' only by taking into account that they have the same prefix and different hashes (as well as being in different directories).