Webpack ts-loader : change tsconfig filename

In Webpack 4 you need to specify the options into a use object:

use: [{
    loader: 'ts-loader',
    options: {
        configFile: "tsconfig.webpack.json"
    }
}]

Complete Webpack config:

var path = require('path');

module.exports = {
    entry: path.resolve(__dirname, 'src') + '/index.ts',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'your-library-name.js',
    },
    module: {
        rules: [
            {
                test: /\.ts$/,
                use: [{
                    loader: 'ts-loader',
                    options: {
                        configFile: "tsconfig.webpack.json"
                    }
                }],
                exclude: /node_modules/,
            }
        ]
    },
    mode: 'development',
    resolve: {
        extensions: ['.js', '.ts']
    },
    devtool: false
};