For to while

Option: transforms.forToWhile

What it changes

Rewrites classic for loops as equivalent while loops. for...in and for...of loops stay unchanged.

for (var i = 0; i < 3; i++) {
  if (skip(i)) {
    continue;
  }
  log(i);
}

var i = 0;
while (i < 3) {
  _forIter: {
    if (skip(i)) {
      break _forIter;
    }
    log(i);
  }
  i++;
}

Run this transform by setting transforms.forToWhile to true:

obfuscate.mjs

const output = obfuscate(source, {
  transforms: {
    forToWhile: true,
  },
})

Open the TypeScript implementation on GitHub.

Review behavior checks and cases this transform leaves alone.

Last modified on August 26, 2026