Optional chaining to ternaries

Option: transforms.optionalChainingToTernary

What it changes

Rewrites optional chains as equivalent conditional expressions while preserving short-circuiting and method receivers.

Before and after

obj?.m(arg);
delete obj?.x;
a?.b?.c;

(obj === null ? true : obj === void 0) ? void 0 : obj.m(arg);
(obj === null ? true : obj === void 0) ? true : delete obj.x;
(a === null ? true : a === void 0) ? void 0 :
  ((_b = a.b) === null ? true : _b === void 0) ? void 0 : _b.c;

Configuration

Run this transform by setting transforms.optionalChainingToTernary to true:

obfuscate.mjs

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

View the implementation

Open the TypeScript implementation on GitHub.

Read the behavior tests

Review behavior checks and cases this transform leaves alone.

Last modified on August 30, 2026

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Reference

Support

Optional chaining to ternaries

What it changes

Before and after

Configuration

View the implementation

Read the behavior tests

​What it changes

​Before and after

​Configuration

View the implementation

Read the behavior tests

What it changes

Before and after

Configuration