Do-while to while

Option: transforms.doWhileToWhile

What it changes

Rewrites do...while loops as equivalent while loops while preserving continue behavior.

do {
  step();
  if (skip()) continue;
  log();
} while (more());

while (true) {
  _doIteration: {
    step();
    if (skip()) break _doIteration;
    log();
  }
  if (!more()) break;
}

Run this transform by setting transforms.doWhileToWhile to true:

obfuscate.mjs

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

Open the TypeScript implementation on GitHub.

Review behavior checks and cases this transform leaves alone.

Last modified on August 26, 2026