TypeError: chunk.isInitial is not a function

[GMartigny]

Hello,

I tried using the plugin, but got an error saying that "chunk.isInitial is not a function".

I'm using:

node: 12.9.0
webpack: 4.39.2
webpack-cli: 3.3.7

My config is the same as the readme example:

const ButternutWebpackPlugin = require("butternut-webpack-plugin").default;

module.exports = {
    plugins: [
        new ButternutWebpackPlugin({}),
    ],
};

With nothing else because I take advantage of default values

I guess this is an incompatibility with webapck@4 because I also have a warning "DeprecationWarning: Tapable.plugin is deprecated. Use new API on .hooks instead"