Use svelte.config.js's extensions for plugin-svelte input (#1373)

* Use svelte.config.js's extensions for plugin-svelte input if available (and not overridden by plugin config) * Update README
FredKSchott · Oct 21, 2020 · e10e724 · e10e724 · vercel · Oct 21, 2020
1 parent d90a1fb
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diff --git a/plugins/plugin-svelte/README.md b/plugins/plugin-svelte/README.md
@@ -22,7 +22,7 @@ By default, this plugin will look for a `svelte.config.js` file in your project
 | Name              |                                  Type                                  | Description                                                                                                         |
 | :---------------- | :--------------------------------------------------------------------: | :------------------------------------------------------------------------------------------------------------------ |
 | `configFilePath`  |                                `string`                                | Relative path to a Svelte config file. Defaults to load `svelte.config.js` from the current project root directory. |
-| `input`           |                               `string[]`                               | Array of file extensions to process. Defaults to `['.svelte']`.                                                     |
+| `input`           |                               `string[]`                               | Array of file extensions to process. Uses `svelte.config.js` `extensions` if available. Defaults to `['.svelte']`.  |
 | `preprocess`      | [svelte.preprocess options](https://svelte.dev/docs#svelte_preprocess) | Configure the Svelte pre-processor. If this option is given, the config file `preprocess` option will be ignored.   |
 | `compilerOptions` |    [svelte.compile options](https://svelte.dev/docs#svelte_compile)    | Configure the Svelte compiler.If this option is given, the config file `preprocess` option will be ignored.         |
 | `hmrOptions`      |        [svelte-hmr options](https://github.com/rixo/svelte-hmr)        | Configure HMR & "fast refresh" behavior for Svelte.                                                                 |
diff --git a/plugins/plugin-svelte/plugin.js b/plugins/plugin-svelte/plugin.js
@@ -48,13 +48,14 @@ module.exports = function plugin(snowpackConfig, pluginOptions = {}) {
   let configFilePath = path.resolve(cwd, pluginOptions.configFilePath || 'svelte.config.js');
   let compilerOptions = pluginOptions.compilerOptions;
   let preprocessOptions = pluginOptions.preprocess;
-  let resolveInputOption = pluginOptions.input || ['.svelte'];
+  let resolveInputOption = pluginOptions.input;
   const hmrOptions = pluginOptions.hmrOptions;
 
   if (fs.existsSync(configFilePath)) {
     const configFileConfig = require(configFilePath);
     preprocessOptions = preprocessOptions || configFileConfig.preprocess;
     compilerOptions = compilerOptions || configFileConfig.compilerOptions;
+    resolveInputOption = resolveInputOption || configFileConfig.extensions;
   } else {
     //user svelte.config.js is optional and should not error if not configured
     if (pluginOptions.configFilePath) {
@@ -65,7 +66,7 @@ module.exports = function plugin(snowpackConfig, pluginOptions = {}) {
   return {
     name: '@snowpack/plugin-svelte',
     resolve: {
-      input: resolveInputOption,
+      input: resolveInputOption || ['.svelte'],
       output: ['.js', '.css'],
     },
     knownEntrypoints: [