"Invalid configuration object" after creating a package.json using "npm init" - json

Question

I had a running webpack configuration. But after using npm init to create the following package.json file:
{
"name": "y",
"version": "1.0.0",
"description": "",
"main": "app.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"babel-core": "^6.24.0",
"babel-loader": "^6.4.0",
"babel-preset-es2015": "^6.24.0",
"babel-preset-react": "^6.23.0",
"jshint": "^2.9.4",
"jshint-loader": "^0.8.4",
"node-libs-browser": "^2.0.0",
"webpack": "^2.2.1"
}
}
and installing the following modules:
npm install babel-core babel-loader jshint jshint-loader node-libs-browser
babel-preset-es2015 babel-preset-react webpack --save-dev
I got the error message
Invalid configuration object. Webpack has been initialised using a configuration
object that does not match the API schema.
- configuration.resolve.extensions[0] should not be empty.
When I tried to restart the dev-server using
webpack-dev-server
The webpack.config.json looks like this:
module.exports = {
entry: ["./global.js", "./app.js"],
output: {
filename: "bundle.js"
},
module: {
loaders: [
{
test: /\.es6$/,
exclude: /node_modules/,
loader: 'babel-loader',
query: {
presets: ['react', 'es2015']
}
}
]
},
resolve: {
extensions: ['', '.js', '.es6']
},
}
What could be the problem?

Answer 1

You installed the latest version of webpack with:
npm install --save-dev webpack
Webpack 2 does not allow an empty string in resolve.extensions anymore. Simply remove the empty string from the array of extensions:
resolve: {
extensions: ['.js', '.es6']
},
You should also read the official Migration Guide.