Is it possible to obfuscate the same string with the property when obfuscating the property?

[masx200]

Is it possible to obfuscate the same string with the property when obfuscating the property?

version
0.15.9

 npx -y esbuild test.js --mangle-props=_$ --mangle-quoted

input

export default createclass([
    {
        key: "__walk__",
        value: function () {
            console.log(this.__collapse__);
        },
    },
    {
        key: "__collapse__",
        value: function () {
            console.log(this["__walk__"]);
        },
    },
]);
export function createclass(entries) {
    Object.assign(
        constructor.prototype,
        Object.fromEntries(entries.map(({ key, value }) => [key, value]))
    );
    function constructor() {};
   return constructor
}

output

export default createclass([
  {
    key: "__walk__",
    value: function() {
      console.log(this.a);
    }
  },
  {
    key: "__collapse__",
    value: function() {
      console.log(this.b);
    }
  }
]);
export function createclass(entries) {
  Object.assign(
    constructor.prototype,
    Object.fromEntries(entries.map(({ key, value }) => [key, value]))
  );
  function constructor() {
  }
  return constructor;
}

Expected result

export default createclass([
  {
    key: "l",
    value: function () {
      console.log(this.t);
    },
  },
  {
    key: "t",
    value: function () {
      console.log(this.l);
    },
  },
]);
export function createclass(e) {
  function t() {}
  return (
    Object.assign(
      t.prototype,
      Object.fromEntries(e.map(({ key: e, value: t }) => [e, t]))
    ),
    t
  );
}

[evanw]

No, that’s not possible with esbuild.

[evanw]

Closing as by design. Property mangling in esbuild is a static analysis and requires you to use the properties statically, not dynamically. It's also intentionally designed to work similarly to other tools in the ecosystem.

[evanw]

I'm reopening this because Terser has since added a way to do this: prefixing a string literal with a /* @__KEY__ */ comment. More information here: terser/terser#1365. It seems reasonable to do this in esbuild as well.