Passing empty array is no longer possible

[smashercosmo]

The latest release introduced breaking change (options validation). Passing an empty array is no longer possible. So it broke cases like

new CopyWebpackPlugin(condition ? ['./something'] : [])

example: https://github.com/styleguidist/react-styleguidist/blob/master/src/scripts/make-webpack-config.ts#L100

Expected Behavior

I honestly don't know if it's a valid case to support :)

[alexander-akait]

Change condition [condition ? new CopWebpackPlugin() : false].filter(Boolean), it is expected empty array is not supported

[smashercosmo]

Yeah, I know, that you can write it this way :) But before passing an empty array didn't trigger an error. So, technically, it's a breaking change.

[alexander-akait]

Let's fix it 👍

[boutell]

Watching this as it broke a number of projects, pinning temporarily to 5.0.x

[alexander-akait]

In next release it will be returned and you can't use empty array

[vitalets]

and you can't use empty array

Why?
You can write this check once inside a plugin instead of everyone of us will write this everywhere:

[ patterns.length ? new CopWebpackPlugin({ patterns }) : false ].filter(Boolean)