Allow webpack stats option to overwrite default behaviour

[dangcuuson]

What did you implement:

Closes #260

How did you implement it:

When console log the compile stats, if webpack.config.js has stats configured, use it. Otherwise use default behaviour.

How can we verify it:

Using example/serverless-offline with default config:

After add stats: 'minimal' to webpack config:

Todos:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification config / commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[HyperBrain]

Thanks. The implementation looks good 🙌
Could you additionally add something to the README that mentions the possibility to override the stats with a proper webpack config (maybe only that it is supported)? Then poeple do not have to figure it out by asking questions.

[dangcuuson]

@HyperBrain it's done. 😄

[HyperBrain]

Now it's complete! Thank you.

[dashmug]

This doesn't do anything on my project.

Here's my config:

'use strict'

const path = require('path')
const { CheckerPlugin } = require('awesome-typescript-loader')
const slsWebpack = require('serverless-webpack')
const webpack = require('webpack')

module.exports = {
    entry: slsWebpack.lib.entries,
    target: 'node',
    output: {
        libraryTarget: 'commonjs2',
        path: path.join(__dirname, 'build'),
        filename: '[name].js',
    },
    module: {
        loaders: [
            { test: /\.ts$/, loader: 'awesome-typescript-loader' },
            { test: /\.ejs$/, loader: 'ejs-loader' },
        ],
    },
    externals: ['bcrypt', 'aws-sdk', 'aws-xray-sdk'],
    resolve: {
        extensions: ['.ts', '.js'],
    },
    devtool: 'source-map',
    plugins: [
        new CheckerPlugin(),
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': JSON.stringify('production'),
        }),
    ],
    stats: 'minimal',
}

Package versions:

    serverless: ^1.24.1
    serverless-webpack: ^4.0.0
    webpack: ^3.8.1

I still get the same display in the console even though I added stats: 'minimal'.

[HyperBrain]

@dashmug That's strange.
@dangcuuson Any idea?

[dangcuuson]

@HyperBrain not sure. I'll have a look after work.
@dashmug could you tell me which command you use to run your serverless? Did you use serverless-offline, or local invoke?

[dashmug]

I used sls webpack.

[dangcuuson]

I found the problem:

If you have package option in your serverless.yml, it will map your webpack config into an array, which kind of break my implementation.

The fix should be easy.

@HyperBrain is there a good way to unit test this thing?