context method emitFile() is not supported in serve mode. This plugin is likely not vite-compatible

This is in my svelte.config.js

 transform() {
  const css = getAtomicCss(allPaths);

  this.emitFile({
    type: "asset",
    source: css,
    id: "",
    fileName: "main.css",
  });
},

this.emitFile work good with generateBundle in rollUp now I can't see any alternative of this.emitFile in vite. What should I do?