flat doesn't work.

[mesqueeb]

flat doesn't work in the options.

new Promise((resolve) => copyfiles([from, to], { flat: true }, resolve)

[water-a]

You can just use { up: true } instead of { flat: true } because it seems like the "flat" option isn't even in the copyfiles code. And when you execute via CLI when using the flat flag, it just sets the 'up' flag to true.