vite mod just in parts

vite-mod/readme.md

@@ -1 +1,35 @@
-# Vite Mod file
+# Vite mod for `worker.ts`
+
+## Parts
+
+Main code in transform...
+
+```js
+if (compressRE.test(id)) {
+    const chunk = await bundleWorkerEntry(config, id)
+    const b64c = Buffer.from(
+        await new Promise<Uint8Array>((r) =>
+            gzip(strToU8(chunk.code), { level: 9 }, (_, d) => r(d)),
+        ),
+    ).toString('base64')
+    return {
+        code: `const b64c = "${b64c}"; export default b64c;`,
+        // Empty sourcemap to suppress Rollup warning
+        map: { mappings: '' },
+    }
+}
+```
+
+Import library `fflate`:
+
+```js
+// sometimes needs dedicated library for compress
+import { gzip, strToU8 } from 'fflate'
+```
+
+Reg-ex and other variables:
+
+```js
+// reg-ex for check query
+const compressRE = /[?&]compress\b/
+```