Compile Svelte components.
npm install --save-dev svelte rollup-plugin-svelte
Note that we need to install Svelte as well as the plugin, as it's a 'peer dependency'.
// rollup.config.js;;input: 'src/main.js'output:file: 'public/bundle.js'format: 'iife'plugins:
Preprocessing and dependencies
If you are using the
preprocess feature, then your callback responses may — in addition to the
map values described in the Svelte compile docs — also optionally include a
dependencies array. This should be the paths of additional files that the preprocessor result in some way depends upon. In Rollup 0.61+ in watch mode, any changes to these additional files will also trigger re-builds.
If you're importing a component from your node_modules folder, and that component's package.json has a
"name": "some-component"// this means 'some-component' resolves to 'some-component/src/SomeComponent.svelte'"svelte": "src/MyComponent.svelte"
...then this plugin will ensure that your app imports the uncompiled component source code. That will result in a smaller, faster app (because code is deduplicated, and shared functions get optimized quicker), and makes it less likely that you'll run into bugs caused by your app using a different version of Svelte to the component.
Conversely, if you're publishing a component to npm, you should ship the uncompiled source (together with the compiled distributable, for people who aren't using Svelte elsewhere in their app) and include the
"svelte" property in your package.json.
If you are publishing a package containing multiple components, you can create an
index.js file that re-exports all the components, like this:
and so on. Then, in
package.json, set the
svelte property to point to this
If your Svelte components contain
A better option is to extract the CSS into a separate file. Using the
css option as shown above would cause a
public/main.css file to be generated each time the bundle is built (or rebuilt, if you're using rollup-watch), with the normal scoping rules applied.
If you have other plugins processing your CSS (e.g. rollup-plugin-scss), and want your styles passed through to them to be bundled together, you can use