How to add Webpack 3.8.1 to a Vue project - npm

Question

say I've go this scaffolding : https://github.com/vuejs/vue-cli
I want to add Webpack 3.8.1 to it.
there's already a "build" folder with lots of webpack files in it :
but (one of) the issue(s) is running "webpack" in the project's root returns :
https://webpack.js.org/concepts/ this si the doc I'm supposed to go by.
there's no real example.
it's got :
const path = require('path');
module.exports = {
entry: './path/to/my/entry/file.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'my-first-webpack.bundle.js'
}
};
which I adapted to the best of my ability to :
const path = require('path');
module.exports = {
entry: './src/entry.js',
output: {
path: path.resolve(entry, 'dist'),
filename: 'my-first-webpack.bundle.js'
}
};
I also added a entry.js file containing nothing under src :
and I edited my package.json file to include:
"dependencies": {
"vue": "^2.5.2",
"vue-router": "^3.0.1",
"node-sass": "^4.5.3",
"sass-loader": "^3.2.3",
"style-loader": "^0.19.0",
"extract-text-webpack-plugin": "^3.0.1"
},
"devDependencies": {
"sinon": "^4.0.1",
"webpack": "^3.6.0",
"webpack-dev-server": "^2.9.3",
"vue-loader": "^13.3.0",
"vue-style-loader": "^3.0.1",
and ran :
npm install
npm update
I feel I'm getting somewhat close but I still cannot manage to use the new webpack.

Answer 1

I put my comment as answer to be able to close this question and (hopefuly) help others future users.
I think that your problem is to try to use webpack, you should use the npm run script like: npm run dev or npm run prod, and then the vue+webpack will do the work for you, placing the files where the config says (webpack.base.dev.conf for instance).
If you take a look at package.json, you could see this part:
"scripts": {
"dev": "node build/dev-server.js",
"start": "node build/dev-server.js",
"build": "node build/build.js",
"unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",
"e2e": "node test/e2e/runner.js",
"test": "npm run unit && npm run e2e",
"lint": "eslint --ext .js,.vue src test/unit/specs test/e2e/specs"
},
Every one can be executed with npm run X.
Hope it helps!