This error occurs when packaging with postcss:   Invalid options object. PostCSS Loader has been initialized using an options object that does not match the API schema.

I’ve been searching for information for a long time because the versions are incompatible,

Solution: create a new postcss.config.js file under the root directory

The file configuration is as follows

module.exports={
    plugins:[
        require("postcss-preset-env")
    ]
}

Then delete the options in webpack.config.js and package again.