fix test

Author: Fil

src/rollup.ts

@@ -1,4 +1,4 @@
-import {writeFileSync} from "fs";
+import {writeFile} from "node:fs/promises";
 import {extname, resolve} from "node:path/posix";
 import {nodeResolve} from "@rollup/plugin-node-resolve";
 import {simple} from "acorn-walk";
@@ -8,7 +8,7 @@ import {tailwindPlugin} from "esbuild-plugin-tailwindcss";
 import type {AstNode, OutputChunk, Plugin, ResolveIdResult} from "rollup";
 import {rollup} from "rollup";
 import esbuild from "rollup-plugin-esbuild";
-import {getClientPath, getStylePath, maybeStat} from "./files.js";
+import {getClientPath, getStylePath, maybeStat, prepareOutput} from "./files.js";
 import type {StringLiteral} from "./javascript/source.js";
 import {getStringLiteralValue, isStringLiteral} from "./javascript/source.js";
 import {resolveNpmImport} from "./npm.js";
@@ -200,7 +200,8 @@ async function tailwindConfig(root: string): Promise<ESBuildPlugin> {
   const s = await maybeStat(`./${root}/${twconfig}`);
   const m = await maybeStat(configPath);
   if (!m || !s || !(m.mtimeMs > s.mtimeMs)) {
-    writeFileSync(
+    await prepareOutput(configPath);
+    await writeFile(
       configPath,
       `
 // File generated by rollup.ts; to configure tailwind, edit ${root}/tailwind.config.js