ERROR in multi ./main.js watch when running webpack - reactjs

Question

I get the following error when running:
webpack watch
ERROR in multi ./main.js watch
Module not found: Error: Can't resolve 'watch' in '/Users/name/directory/src'
# multi ./main.js watch
Heres my webpack.config.js file
const path = require('path');
module.exports = {
context: path.join(__dirname, 'src'),
entry: [
'./main.js',
],
output: {
path: path.join(__dirname, 'www'),
filename: 'bundle.js',
},
module: {
rules: [
{
test: /\.js$/,
include: [
path.resolve(__dirname, "src")
],
exclude: /node_modules/,
use: [
'babel-loader',
],
},
{
test: /\.scss$/,
exclude: /node_modules/,
use: [{
loader: "style-loader" // creates style nodes from JS strings
}, {
loader: "css-loader" // translates CSS into CommonJS
}, {
loader: "sass-loader" // compiles Sass to CSS
}]
}
],
},
resolve: {
modules: [
path.join(__dirname, 'node_modules'),
],
},
};
Here is my package.json
{
"name": "name",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"dependencies": {
"react": "^15.4.2",
"react-dom": "^15.4.2",
"webpack-dev-middleware": "^1.10.1"
},
"devDependencies": {
"babel-core": "^6.24.0",
"babel-loader": "^6.4.1",
"babel-preset-es2015": "^6.24.0",
"babel-preset-latest": "^6.24.0",
"babel-preset-react": "^6.23.0",
"babel-preset-stage-2": "^6.22.0",
"css-loader": "^0.27.3",
"express": "^4.15.2",
"node-sass": "^4.5.0",
"react-helmet": "^4.0.0",
"react-hot-loader": "^1.3.1",
"sass-loader": "^6.0.3",
"style-loader": "^0.14.1",
"webpack": "^2.2.1",
"webpack-dev-middleware": "^1.10.1",
"webpack-dev-server": "^2.4.2"
}
}
Below is my main.js file
import "./styles/stylesheet.scss";
import { Header } from "./components/headercomponent";
import React from "react";
import ReactDOM from "react-dom";
import { render } from "react-dom";
class App extends React.Component {
render(){
return (
<div id="container">
<Header/>
<h1>hello world</h1>
</div>
);
}
}
render(<App/>, window.document.getElementById("app"));
Do you know why I'm getting the webpack error?

Answer 1

Arguments you pass to the webpack CLI will be treated as entry points. You want to use the --watch option, not add watch as an entry. The correct command is:
webpack --watch