Fortunately with webpackChunkName in an inline comment, we can instruct webpack to name the file something much friendlier.

Similar to prefetching, you can specify the chunk name with an inline comment using the webpackChunkName key

For example, if the user is on the login page, you can load the post-login home page. An inline comment with the webpackPrefetch key within the dynamic import function will instruct Webpack to do just this.

使用ES6 Module如何处理模块按需加载 (lazyload)？

Five years later, the facts on the ground have finally changed. I no longer believe that this bargain is worth it for most new applications.

From my point of view, this approach will help you to write cleaner code. Also, it will help to maintain the project. For instance, moving a file from the current directory to another will cause fewer problems, because every file uses an absolute path instead of a relative one. Last but not least, it helps you during development.

alias: { '@': path.resolve(__dirname, 'src'),}

Use this to load modules whose location is specified in the paths section of tsconfig.json when using webpack. This package provides the functionality of the tsconfig-paths package but as a webpack plug-in. Using this plugin means that you should no longer need to add alias entries in your webpack.config.js which correspond to the paths entries in your tsconfig.json. This plugin creates those alias entries for you, so you don't have to!

The declarations you make in the tsconfig.json are re-stated in the webpack.config.js. Who wants to maintain two sets of code where one would do? Not me.

Let's not get over-excited. Actually, we're only part-way there; you can compile this code with the TypeScript compiler.... But is that enough?I bundle my TypeScript with ts-loader and webpack. If I try and use my new exciting import statement above with my build system then disappointment is in my future. webpack will be all like "import whuuuuuuuut?"You see, webpack doesn't know what we told the TypeScript compiler in the tsconfig.json.

config: path.resolve(__dirname, '../config'), vue: 'vue/dist/vue.js', src: path.resolve(__dirname, '../src'), store: path.resolve(__dirname, '../src/store'), assets: path.resolve(__dirname, '../src/assets'), components: path.resolve(__dirname, '../src/components'), '@': path.resolve(__dirname, '../src'),

alias: { _self: path.join(__dirname, 'src/web'), _shared: path.join(__dirname, 'src/shared'), _components: path.join(__dirname, 'src/web/components'), _helpers: path.join(__dirname, 'src/web/helpers'), _layers: path.join(__dirname, 'src/web/layers'), _mutations: path.join(__dirname, 'src/web/mutations'), _routes: path.join(__dirname, 'src/web/routes') }

alias: { '@components': path.join(srcDir, 'components'), '@modules': path.join(srcDir, 'modules'), '@store': path.join(srcDir, 'store') }

Aliases are absolute nonsense for resolving imports. If you don't want to type ../ consider using something like path.resolve(__dirname, '../src') so you can do import Stuff from 'client/components/stuff'; // relative to root of project instead of: import Stuff from 'COMPONENTS/stuff'; // this is dumb

alias: { '@shared': path.dirname(require.resolve('app')), '~': path.join(fs.realpathSync(process.cwd()), 'app'), },

In this example, @shared is the package, ~ is the project. I wouldn't do it this way in the future, but I know this configuration works.

alias: { Library: path.resolve(__dirname, "root/library/"), Single: path.resolve(__dirname, "root/test.js"), },

alias: { Single$: path.resolve(__dirname, "root/test.js"), },

Webpack's resolve.mainFields option determines which fields in package.json are used to resolve identifiers. If you're using Svelte components installed from npm, you should specify this option so that your app can use the original component source code, rather than consuming the already-compiled version (which is less efficient).

Webpack 5 no longer polyfills Node.js core modules automatically which means if you use them in your code running in browsers or alike, you will have to install compatible modules from npm and include them yourself. Here is a list of polyfills webpack has used before webpack 5:

I am not going to do Webpack support. I’ve been pretty lenient in the past and answered most Webpack support questions, but it takes a lot of my time that I could have spent on more important things. I will instead refer users to the Webpack support channels.

Run the Rails server (bin/rails s) and the Webpack Dev Server (bin/webpack-dev-server) via your preferred method. Two terminal tabs will work or create a Procfile and run via overmind or foreman.

static module bundler

Meh... as I said earlier, I think using Webpack is the recommended way now. Another issue is there is no way to generate source maps in production.

But last I have seen comments from DHH, he considered webpack(er) recommended for JS, but Sprockets still the preferred solution for (S)CSS.

I agree about lack of maintenance. It's probably because people use more and more Webpack.

Ruby on Rails 6 Note:: With the release of Rails 6 there have been some minor changes made to the default configuration for The Asset Pipeline. In specific, by default Sprockets no longer processes JavaScript and instead Webpack is set as the default. The twbs/bootstrap-rubygem is for use with Sprockets not Webpack.

6. Add Purgecss for unused CSS removal (optional) Add Purgecss to Sage. Once you’ve successfully added Purgecss, you will need to complete an addition step to make sure Purgecss can extract Tailwind’s classes properly. Luckily, Tailwind has a guide in their docs to add a custom Purgecss extractor.

If you're using webpack with svelte-loader, make sure that you add "svelte" to resolve.mainFields in your webpack config. This ensures that webpack imports the uncompiled component (src/index.html) rather than the compiled version (index.mjs) — this is more efficient.

The webpack templates now have resolve.alias in their config

BTW, the modules used to be called moduleDirectories in previous versions.

The resolving process is basically simple and distinguishes between three variants: absolute path: require("/home/me/file") relative path: require("../src/file") or require("./file") module path: require("module/lib/file")

In contrast to import (which handles 1+2 pretty much the same way, but would send you looking in node_modules right away) path 'module' indeed means your project root for paths without a need to resolve, like output.path in your webpack config... and: (on resolving) Only 3 is subject to resolve.root and resolve.moduleDirectories resolving, see webpack docs here

The problem is that by default, module paths only work with things imported via npm because the new modules variable on resolve defaults to ["node_modules"]. This lets you import 3rd party code from npm really easily. But it means importing your code with a module path needs a config change.

When enabled, symlinked resources are resolved to their real path, not their symlinked location. Note that this may cause module resolution to fail when using tools that symlink packages (like npm link)

The webpack repository contains an example showing the effect of all devtool variants. Those examples will likely help you to understand the differences.

resolve: { extensions: ['.jsx', '.js'], modules: [ path.resolve(__dirname, 'src'), 'node_modules' ] },

There was a major refactoring in the resolver (https://github.com/webpack/enhanced-resolve). This means the resolving option were changed too. Mostly simplification and changes that make it more unlikely to configure it incorrectly.

For future reference, webpack 2 removed everything but modules as a way to resolve paths. This means root will not work.

The resolve.alias option is used to make sure that only one copy of the Svelte runtime is bundled in the app, even if you are npm linking in dependencies with their own copy of the svelte package. Having multiple copies of the internal scheduler in an app, besides being inefficient, can also cause various problems.

If your Svelte components contain <style> tags, by default the compiler will add JavaScript that injects those styles into the page when the component is rendered. That's not ideal, because it adds weight to your JavaScript, prevents styles from being fetched in parallel with your code, and can even cause CSP violations. A better option is to extract the CSS into a separate file. Using the emitCss option as shown below would cause a virtual CSS file to be emitted for each Svelte component. The resulting file is then imported by the component, thus following the standard Webpack compilation flow.

If you rely on any external dependencies (files required in a preprocessor for example) you might want to watch these files for changes and re-run svelte compile. Webpack allows loader dependencies to trigger a recompile. svelte-loader exposes this API via options.externalDependencies.

webpack sure wastes a lot of time when things go wrong.

webpack causing more problem than it solves. Why this would not work i don't get it.

Since Sass/libsass does not provide url rewriting, all linked assets must be relative to the output. Add the missing url rewriting using the resolve-url-loader.

Secondly, whether this works is highly dependent on the module bundler. For example, in codesandbox, when bundling our app with Parcel (or Webpack or Rollup), this solution doesn’t work. However, when running this locally with Node.js and commonJS modules this workaround might work just fine.

Doing so also means adding empty import statements to guarantee correct order of evaluation of modules (in ES modules, evaluation order is determined statically by the order of import declarations, whereas in CommonJS – and environments that simulate CommonJS by shipping a module loader, i.e. Browserify and Webpack – evaluation order is determined at runtime by the order in which require statements are encountered).

formvalidation: path.resolve

import luhn from 'formvalidation/algorithms/luhn';

If you're using Rollup with rollup-plugin-svelte, this will happen automatically.

If you're using webpack with svelte-loader, make sure that you add "svelte" to resolve.mainFields in your webpack config. This ensures that webpack imports the uncompiled component (src/index.html) rather than the compiled version (index.mjs) — this is more efficient.

You can then ensure that only one instance of angular is loaded from your main module by adding an alias

Personally for me, this is incredibly hard to read. Regex everywhere, nested objects with different rules and configurations that are very intuitive, multiple loaders that resolve backwards, built in loaders having obscure issues that require using third party loaders in between, separation of plugins and loaders, and so on.

For the past couple of years in particular however, I’ve stopped using Webpack to develop them, opting instead to use Rollup as my primary bundler for apps.

I think your error is because you don't have .mjs in your webpack's resolve.extensions. The file singled out by the error message ./internal is actually a .mjs file, but you only have .svelte extensions...

Svelte needs to be deduped. Adding a Webpack alias for resolution of the module appears to be a temporary workaround:

type: "javascript/auto

Unlike the webpack config, webpacker.yml settings are determined by the current RAILS_ENV.

Thanks also to this example from the D3 gallery for demonstating how to create sunburst charts.

Bundle Analysis

resolve.alias

If none of these commands identified the duplication, try analyzing your bundle for multiple instances of @material-ui/styles. You can just check your bundle source, or use a tool like source-map-explorer or webpack-bundle-analyzer.

This works, but… it's super hacky. I don't really understand the intent of the abstractions in webpack-chain, and looking through the code of existing modules makes me think every module is currently inventing its own hacks to work around some fundamental limitations here.

Webpack supports the ability to run multiple builds by exporting an array of configurations instead of a single configuration.

Various test runners support using compiled webpack code to drive tests, but may be difficult to integrate with webpack, and Neutrino helps alleviate this

To make some of this possible, we had to create our webpack configuration API, called webpack-chain. As you may know, webpack exposes a low-level configuration format, but this format isn't well-suited for merging configuration deterministically across middleware, or even across many projects. With webpack-chain, we expose a chainable or fluent API for aggregating a webpack configuration which is much more deterministic.

Neutrino combines the power of webpack with the simplicity of presets

Whereas Webpack bundles all our JavaScript source code files into one bundle (including custom configured build steps), Babel enables us to use recent JavaScript features that are not supported by many browsers yet.

When you do import '../src/application.css', you're telling webpack include application.css in the build. This does not mean it's going to be compiled into your javascript, only that webpack now knows that you want to compile this file. How that file compilation is handled is depending on how your loaders (css-loader, sass-loader, file-loader, etc.. ) are configured.

If you are using webpack

npm install eslint-loader --save-dev

To get it to work, you have to install it first through npm install nodemon --save-dev. After that, you can make it watch webpack config and restart WDS on change. Here's the script if you want to give it a go:

npm install --save-dev webpack webpack-dev-server react-hot-loader

sudo npm install --save-dev webpack-dev-server -g

var webpack = require('webpack');

const path = require('path'); 

path: 'dist'

path: path.resolve(__dirname, 'dist')

loader: 'react-hot!babel'

loader: 'react-hot-loader!babel-loader'

webpack ./entry.js bundle.js --module-bind 'css=style!css'

To partition your code into library and application bundles, you will need to create two Webpack configurations, one that creates the library bundle(s) and another that creates the application bundle(s) that use code from the libraries.

but also it is extremely easy to transition from browserify to webpack when needed.

If however, you’re predominantly dependent on the NPM ecosystem and you want a tool with a small and very well designed API and takes minimal configuration, you should go for Browserify

The greatest advantage Webpack has over these tools is Hot Module Replacement (HMR). In short, it provides a way to patch the browser state without a full refresh. We'll discuss it in more detail when we go through the React setup