vite.config.js

import { spawnSync } from "child_process";
import { defineConfig } from "vite";

function isDev() {
  return process.env.NODE_ENV !== "production";
}

function printSbtTask(task) {
  const args = ["--error", "--batch", `print ${task}`];
  const options = {
    stdio: [
      "pipe", // StdIn.
      "pipe", // StdOut.
      "inherit", // StdErr.
    ],
  };
  const result = process.platform === 'win32'
    ? spawnSync("sbt.bat", args.map(x => `"${x}"`), {shell: true, ...options})
    : spawnSync("sbt", args, options);

  if (result.error)
    throw result.error;
  if (result.status !== 0)
    throw new Error(`sbt process failed with exit code ${result.status}`);
  return result.stdout.toString('utf8').trim();
}

const linkOutputDir =
  printSbtTask(isDev() ? "fastLinkOutputDir" : "fullLinkOutputDir");

export default defineConfig({
  resolve: {
    alias: [ { find: "@linkOutputDir", replacement: linkOutputDir } ]
  }
});