the new build script

package.json

@@ -1,5 +1,11 @@
 {
+  "name": "oscillation",
+  "version": "0.3.0",
   "type": "module",
+  "scripts": {
+    "test": "playwright test",
+    "build": "rollup --config rollup.config.js"
+  },
   "prettier": {
     "printWidth": 100,
     "trailingComma": "all",
@@ -9,6 +15,7 @@
     "@playwright/test": "^1.48.1",
     "prettier": "^3.3.3",
     "rollup": "^4.24.0",
+    "rollup-plugin-copy": "^3.5.0",
     "rollwright": "^0.0.7"
   }
 }

rollup.config.js

@@ -0,0 +1,40 @@
+import { defineConfig } from "rollup";
+import copy from "rollup-plugin-copy";
+
+export default defineConfig({
+  input: "./oscillation.js",
+  output: { dir: "build" },
+  plugins: [
+    copy({
+      targets: [
+        { src: ["LICENSE", "oscillation.d.ts"], dest: "build" },
+        { src: "package.json", dest: "build", transform: generatePackageJson },
+      ],
+    }),
+  ],
+});
+
+function generatePackageJson(contents) {
+  let pkg = JSON.parse(contents.toString());
+  let newPkg = {
+    name: pkg.name,
+    version: pkg.version,
+    description: pkg.description,
+    license: pkg.license,
+    author: pkg.author,
+    homepage: pkg.homepage,
+    repository: pkg.repository,
+    type: "module",
+    main: "./oscillation.js",
+    module: "./oscillation.js",
+    exports: {
+      ".": "./oscillation.js",
+    },
+    files: ["*.js", "*.d.ts"],
+    sideEffects: false,
+    keywords: pkg.keywords,
+    dependencies: pkg.dependencies,
+    peerDependencies: pkg.peerDependencies,
+  };
+  return JSON.stringify(newPkg, null, 2);
+}