ReferenceError: require2 is not defined

[MyPledge]

Using Vite's build function via Gulp throws ReferenceError: require2 is not defined during LESS build

I'm building a library by calling Vite's build function programmatically inside a Gulp task.
During the build process, when compiling LESS files, the build throws the following exception: ReferenceError: require2 is not defined

---

🔍 Debugging

By debugging, I located the problematic code around this snippet inside Vite’s internal modules:

const makeWorker = () => new WorkerWithFallback(() => async (terserPath$1, code, options$1) => {
  const terser = require(terserPath$1);
  return terser.minify(code, options$1);
}, {
  shouldUseFake(_terserPath, _code, options$1) {
    return !!(typeof options$1.mangle === "object" && 
      (options$1.mangle.nth_identifier?.get || 
       (typeof options$1.mangle.properties === "object" && options$1.mangle.properties.nth_identifier?.get)) || 
      typeof options$1.format?.comments === "function" || 
      typeof options$1.output?.comments === "function");
  },
  max: maxWorkers
});

Inside the constructor of WorkerWithFallback, I logged the function passed in by calling fn.toString().
To my surprise, the logged function source already has require replaced by require2:

Questions

• Why is the original require being transformed to require2 at runtime inside Vite's internal code?

• Where is require2 defined or supposed to be defined?

• How can I fix this error so that the build completes successfully when invoked via Gulp?

• Is this caused by the way Vite bundles its internal worker code?

• Is there a recommended way to use Vite's build function programmatically without hitting this?

Environment

• Vite version: 7.0.6

• Node.js version: (please specify your version)

• Gulp version: 4.x

• OS: (please specify your OS)