setup webpack and vue3

Question

I'am trying to setup vue3 with webpack and typescript. Currently I have the problem that whenever I try to run webpack serve, there will be a warning inside the browser console:

runtime-core.esm-bundler.js:3413 You are running the esm-bundler build of Vue. It is recommended to configure your bundler to explicitly replace feature flag globals with boolean literals to get proper tree-shaking in the final bundle. See http://link.vuejs.org/feature-flags for more details.

Which I do not understand. My webpack-config is as follows:

const path = require("path")

module.exports = {
    mode: 'development',
    entry: './src/index.ts',
    devtool: 'inline-source-map',
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                use: 'ts-loader',
                exclude: /node_modules/,
            },
        ],
    },
    resolve: {
        alias: {
            vue: "vue/dist/vue.esm-bundler.js"
        },
        extensions: ['.tsx', '.ts', '.js'],
    },
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist'),
    },
}

And this is the tsconfig:

{
    "compilerOptions": {
        "outDir": "./dist/",
        "noImplicitAny": true,
        "module": "es6",
        "target": "es5",
        "allowJs": true,
        "moduleResolution": "node"
    }
}

I would like to have a configuration without this warning and then move on to having support for sfc!

Answer 1

From the link you got in the error.

The build will work without configuring these flags, however it is strongly recommended to properly configure them in order to get proper tree-shaking in the final bundle.

This should solve your issues.

const path = require("path");
const webpack = require('webpack');

module.exports = {
    mode: 'development',
    entry: './src/index.ts',
    devtool: 'inline-source-map',
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                use: 'ts-loader',
                exclude: /node_modules/,
            },
        ],
    },
    resolve: {
        alias: {
            vue: "vue/dist/vue.esm-bundler.js"
        },
        extensions: ['.tsx', '.ts', '.js'],
    },
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist'),
    },
    plugins: [
        new webpack.DefinePlugin({
            "__VUE_OPTIONS_API__": true,
            "__VUE_PROD_DEVTOOLS__": false,
        });
    ],
}

It is also worth adding, that @vue-cli is the standard tooling for vue projects.