node894-x64, webpack 4.0.1
Error

npx webpack src/index.js --output dist/bundle.js --mode production
npx: installed 1 in 3.062s
Path must be a string. Received undefined

im not sure may that not need fix, I`m reconfig package.json(add scripts), after it -> and that error go out. Be cause i use other command. just "npm run dev", or "npm run build".

{
"name": "_webdev",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"dev": "webpack --mode development",
"build": "webpack --mode production",
"test": "echo "Error: no test specified" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"babel-preset-env": "^1.6.1",
"eslint": "^4.18.2",
"webpack": "^4.0.1",
"webpack-cli": "^2.0.10"
},
"dependencies": {
"d3": "^4.13.0"
}
}

Has the build issue been fixed?