Svelte Browser Import

Import and render svelte files and components directly in the browser without a build step. [Development only]

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Svelte Browser Import

This is a simple library that includes the svelte compiler and provides functions to import and render a Svelte App/Component (.svelte files) directly inside a browser without a build step. (Useful for development and testing)

Extracted out the Bundler from the Svelte REPL.

Working demos: https://repalash.com/svelte-browser-import/index.html

Usage

Use the importSvelte and render functions to render a svelte app inside the body of the current page. This uses eval to evaluate the code, so it is not recommended to use this in production.

importSvelte

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Svelte Browser Import</title>
    <script type="module">
        import { importSvelte } from 'https://unpkg.com/svelte-browser-import/dist/svelte-browser-import.es.js';
        const App = await importSvelte('./HelloWorld.svelte')
        const app = new App({
            target: document.getElementById('app'),
        })
        
        // app.$destroy() // destroy the app
        
        // or just 
        // renderSvelte('./HelloWorld.svelte')
    </script>
</head>
<body>
<div id="app"></div>
</body>
</html>

importSvelteUrls

To import multiple files which import each other, use the importSvelteUrls or importSvelteBundle function to import the files and then use the render function to render the app.

This needs a file named App.svelte which is the entry point, if not provided, the only file in the list will be renamed to App.svelte, if multiple files, then an App.svelte is created that renders all the files as components in the order they are provided.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Svelte Browser Import</title>
    <script type="module">
        import { importSvelteUrls } from 'https://unpkg.com/svelte-browser-import/dist/svelte-browser-import.es.js';
        const App = await importSvelteUrls([
            './App.svelte',
            './Nested.svelte',
        ])
        const app = new App({
            target: document.getElementById('app'),
        })
        
        // or just 
        // renderSvelteUrls([
        //     './App.svelte',
        //     './Nested.svelte',
        // ], {
        // target: document.getElementById('app'),
        // })
    </script>
</head>
<body>
<div id="app"></div>
</body>
</html>

importSvelteBundle

Use the importSvelteBundle function to get access to all the parameters. Check the file src/main.ts for more details.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Svelte Browser Import</title>
    <script type="module">
        import { importSvelteBundle } from 'https://unpkg.com/svelte-browser-import/dist/svelte-browser-import.es.js';
        const res = await importSvelteBundle({
            urls: [
                './App.svelte',
                './Nested.svelte',
            ],
            // files: [ // only one of urls or files can be provided
            //     {
            //         name: 'App',
            //         type: 'svelte',
            //         content: '...',
            //         modified: true,
            //     }
            // ],
            packagesUrl: 'https://unpkg.com',
            svelteUrl: 'https://unpkg.com/svelte',
            injectedJS: '',
            injectedCSS: '',
            onstatus: (val) => {
                console.log(val)
            },
        })
        console.log(res)
        const App = new res.render()
        const app = new App({
            target: document.getElementById('app'),
        })
    </script>
</head>
<body>
<div id="app"></div>
</body>
</html>

Non-module usage

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Svelte Browser Import</title>
    <script src="https://unpkg.com/svelte-browser-import"></script>
    <script>
        const { importSvelte } = window["svelte-browser-import"]

        importSvelte('./HelloWorld.svelte').then(App=> {
            const app = new App({
                target: document.getElementById('app'),
                props: {
                    name: 'custom app'
                }
            })
            // to destroy the app
            // app.$destroy()
        })
    </script>
</head>
<body>
    <div id="app"></div>
</body>
</html>

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