javascript - what dose the '-d' option in watchify(a npm package ) mean? -

here package's link:https://www.npmjs.com/package/watchify saw usage somewhere: "watchify -o js/bundle.js -v -d js/app.js". hope know dose '-d' option mean. thank you.

according watchify source code, gets passed on browserify, , taken https://github.com/substack/node-browserify#usage:

--debug -d enable source maps allow debug files separately.