Const to let

Option: transforms.constToLet

What it changes

Changes const declarations to let.

const foo = "bar";
const { a, b } = obj;

let foo = "bar";
let { a, b } = obj;

Run this transform by setting transforms.constToLet to true:

obfuscate.mjs

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

Open the TypeScript implementation on GitHub.

Review behavior checks and cases this transform leaves alone.

Last modified on August 26, 2026