svelte-ssr Svelte Themes

Svelte Ssr

Svelte server side rendering tool with development and production mode to build webpack

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Svelte server side rendering tool

This tool gives an ability to run express.js server to render svelte.js application on server side with functionality to preload svelte.js application data via api requests before send response to client.

Take a look at fully packed example of integration with webpack in svelte-ssr-template-webpack.

⚠️ Currently this tool supports only webpack.js assets bundler.

How it works?

You can run this tool in production or development modes.

How it works in production mode?

Firstly you have to build your app with assets bundler. As output you need client.js and server.js. Then you need to start server.js with node.js and this service will perform server side rendering requests.

How it works in development mode?

In development mode this tool will launch development server for client.js and server.js and node.js service to perform server side rendering requests.

How to install it?

1. Install via npm

npm install --save svelte-ssr

How to setup it?

1. Create index.html file inside src folder

<!DOCTYPE html>
<html lang="ru">
  <head>
    <meta charset="UTF-8" />
  </head>

  <body>
    <div id="root"></div>
  </body>
</html>

1. Create App.svelte file inside src folder

<script context="module">
  /**
   * @param {{ base: string, path: string, inner: string, query: {} }} location - requested location
   * @param {resolveCallback} resolve - resolve prepared result
   * @param {{ redirect: redirectCallback }} helpers - preload helpers
   * @returns any
   */
  export async function preload(location, resolve, helpers) {
    // preload data with api requests for example via `axios`
    return { preloaded: { foo: 'bar' } };
  }
  /**
   * Return resolved candidate.
   * @callback resolveCallback
   * @param {any} candidate
   * @param {callback} prepare
   */
  /**
   * Return redirect instance.
   * @callback redirectCallback
   * @param {number} status
   * @param {string} url
   */
</script>

<script>
  // `client`, `server` or `node`
  export let entry = process.env.ENTRY;

  // this property will be available
  // only in server side rendering scenario
  export let path = undefined;
  
  // data which has been preloaded
  // from the preload method
  export let preloaded = {};
</script>

<div id="app">
  <!-- render content -->
</div>

3. Create server.js file inside src folder

import path from 'path';
import {
  cleanServerInstanceOnExit,
  createCatchMiddleware,
  createRedirectMiddleware,
  createRenderMiddleware,
  createServer,
  createServerInstance,
  createStaticMiddleware,
  resolveCommandOptions
} from 'svelte-ssr/server';
import component, { preload } from './App.svelte';

// create plain express server
const app = createServer();

// resolve command line arguments
const { port, base, staticProxyPort, staticPathToDirectory } = resolveCommandOptions();

// serve static content with the magic middleware
// if both development severs are running - this middleware
// serve files from client development server port
app.use(createStaticMiddleware({ base, staticProxyPort, staticPathToDirectory, verbose: true }));

// serve content to render based on desired template
// and render request content inside the target
const targetSelector = '#root';
const pathToTemplate = path.resolve(__dirname, '..', 'build', 'client', 'index.html');
app.use(createRenderMiddleware({
  base,
  component,
  preload,
  pathToTemplate,
  targetSelector,
  verbose: true,
  debug: true
}));

// redirect all not resolved requests to the base
app.use(createRedirectMiddleware({ base, verbose: true }));

// log into console all errors
app.use(createCatchMiddleware({ verbose: true }));

// listen desired port by the server and clean server instance on node application exit event
const instance = createServerInstance(app, port, () => console.log(`Server is ready on ':${port}'`));
cleanServerInstanceOnExit(instance);

4. Create client.js file inside src folder

// import core dependencies
import { renderClient } from 'svelte-ssr/client';
import component from './App.svelte';

// import application styles
import './styles/global.pcss';

// render application inside the target
renderClient({ component, target: '#root' });

5. Create webpack.config.server.js file

const path = require('path');
const { createWebpackServerConfig } = require('svelte-ssr/webpack');

const config = production => createWebpackServerConfig({
  resolve: {
    extensions: ['.mjs', '.js', '.svelte', '.json'],
    alias: {
      svelte: path.resolve(__dirname, 'node_modules', 'svelte')
    }
  },

  module: {
    rules: [
      {
        test: /\.svelte$/,
        use: {
          loader: 'svelte-loader',
          options: {
            emitCss: false,
            generate: 'ssr',
            hydratable: true,
            hotReload: true,
            dev: !production,
            preprocess: require('svelte-preprocess')({ postcss: true })
          }
        }
      },
      {
        test: [/\.css$/, /\.pcss$/],
        loader: 'null-loader'
      }
    ]
  }
}, { production });

module.exports = (_, { mode }) => {
  return config(mode === 'production');
};

6. Create webpack.config.client.js file

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const { addWebpackProductionHash, createWebpackClientConfig } = require('svelte-ssr/webpack');

const config = production => createWebpackClientConfig({
  resolve: {
    extensions: ['.mjs', '.js', '.svelte', '.json'],
    alias: {
      svelte: path.resolve(__dirname, 'node_modules', 'svelte')
    }
  },

  module: {
    rules: [
      {
        test: /\.svelte$/,
        use: {
          loader: 'svelte-loader',
          options: {
            emitCss: true,
            hydratable: true,
            hotReload: true,
            dev: !production,
            preprocess: require('svelte-preprocess')({ postcss: true })
          }
        }
      },
      {
        test: [/\.css$/, /\.pcss$/],
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: { hmr: !production }
          },
          'css-loader',
          'postcss-loader'
        ]
      }
    ]
  },

  plugins: [
    new MiniCssExtractPlugin({
      filename: addWebpackProductionHash('[name].css', production)
    }),

    new HtmlWebpackPlugin({
      inject: true,
      template: path.resolve(__dirname, 'src', 'index.html')
    })
  ]
}, { production });

module.exports = (_, { mode }) => {
  return config(mode === 'production');
};

6. Add the following scripts to your package.json file

{
  "scripts": {
    "start": "node ./node_modules/svelte-ssr/build/cli.js development -b webpack -c webpack.config.client.js -s webpack.config.server.js",
    "build": "node ./node_modules/svelte-ssr/build/cli.js build -b webpack -c webpack.config.client.js -s webpack.config.server.js",
    "production": "node ./node_modules/svelte-ssr/build/cli.js production -b webpack -c webpack.config.client.js -s webpack.config.server.js"
  }
}

7. Run in development mode

npm run start

8. Run in production mode

npm run build
npm run production

How to configure it?

This tool has a help to display all supported commands and options.

$ ./node_modules/.bin/svelte-ssr help  
Usage: svelte-ssr [options] [command]

Tool to launch server side rendering service

Options:
  -V, --version          output the version number
  -h, --help             output usage information

Commands:
  build [options]        Build client and server entries
  development [options]  Launch client and server development servers and node server to serve server side rendering
  production [options]   Launch node server to serve server side rendering

Build command

$ ./node_modules/.bin/svelte-ssr build --help
Usage: svelte-ssr build [options]

Build client and server entries

Options:
  -b, --bundler <webpack>                 Which tool to use to bundle assets (only webpack is supported right now)
  -c, --client-config <config.client.js>  Path to bundler tool client config
  -s --server-config <config.server.js>   Path to bundler tool server config

Development command

$ ./node_modules/.bin/svelte-ssr development --help
Usage: svelte-ssr development [options]

Launch client and server development servers and node server to serve server side rendering

Options:
  -b, --bundler <webpack>                 Which tool to use to bundle assets (only webpack is supported right now)
  --base </>                              Base html tag to listen for the server
  -p --node-port <3000>                   Port to listen for server side rendering server
  -c, --client-config <config.client.js>  Path to bundler tool client config
  --client-port <8080>                    Port to listen for client bundler
  -s --server-config <config.server.js>   Path to bundler tool server config
  --server-port <8081>                    Port to listen for server bundler

Production command

$ ./node_modules/.bin/svelte-ssr production --help
Usage: svelte-ssr production [options]

Launch node server to serve server side rendering

Options:
  -b, --bundler <webpack>                 Which tool to use to bundle assets (only webpack is supported right now)
  --base </>                              Base html tag to listen for the server
  -p --node-port <3000>                   Port to listen for server side rendering server
  -c, --client-config <config.client.js>  Path to bundler tool client config
  -s --server-config <config.server.js>   Path to bundler tool server config

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