added script to upload vanilla .svelte components.

package.json

@@ -4,14 +4,18 @@
   "module": "dist/index.mjs",
   "main": "dist/index.js",
   "scripts": {
+    "postinstall": "npm run build",
+    "postbuild": "node script.js",
     "build": "rollup -c",
     "prepublishOnly": "npm run build"
   },
   "devDependencies": {
     "@rollup/plugin-node-resolve": "^6.0.0",
+    "glob": "^7.1.6",
     "rollup": "^1.20.0",
     "rollup-plugin-svelte": "^5.0.0",
-    "svelte": "^3.0.0"
+    "svelte": "^3.0.0",
+    "svelte-preprocess": "^4.1.1"
   },
   "keywords": [
     "svelte"

script.js

@@ -0,0 +1,54 @@
+const svelte = require("svelte/compiler");
+const autoprocessor = require("svelte-preprocess");
+const fs = require("fs");
+const path = require("path");
+const glob = require("glob");
+
+const runCommand = async () => {
+  // source file paths
+  const srcPath = path.join(__dirname, "src");
+
+  // read glob of files in directory
+  glob(path.join(srcPath, "**/*.svelte"), {}, (error, files) => {
+    // handling error
+    if (error) {
+      return console.log("Unable to scan directory: " + error);
+    }
+    // listing all files using forEach
+    files.forEach(async (file) => {
+      // load file
+      const sourceFile = fs.readFileSync(file, "utf-8");
+      const distFile = file.replace("/src/", "/dist/");
+
+      // process .svelte file
+      if (file.includes(".svelte")) {
+        // run autopreprocessor
+        await ParseSvelte(sourceFile, distFile);
+      }
+      // copy other files
+      else {
+        // copy static files
+        fs.copyFileSync(file, distFile);
+      }
+    });
+  });
+};
+
+const ParseSvelte = async (source, destination) => {
+  await svelte
+    .preprocess(source, autoprocessor(), {
+      filename: path.basename(destination),
+    })
+    .then((item) => {
+      // create directory and file
+      fs.mkdirSync(path.dirname(destination), {
+        recursive: true,
+      });
+      // write compiled code to dist file
+      fs.writeFileSync(destination, item.code);
+    })
+    .catch((error) => {
+      console.error(error.message);
+    });
+};
+runCommand();