Added Markdown preview

node_modules/crelt/rollup.config.js

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+import copy from "rollup-plugin-copy"
+
+export default {
+  input: "index.js",
+  output: {
+    file: "dist/index.cjs",
+    format: "cjs",
+    exports: "default"
+  },
+  plugins: [
+    copy({targets: [{src: "index.d.ts", dest: "dist", rename: () => "index.d.cts"}]})
+  ]
+}