mimic esbuild module transformer

[magic-akari]

Giving the following input

export let foo = 1;

export const inc = () => {
    return foo++;
}

export function dec(){
    return foo--;
}

esbuild output(click bundle button to see result)

var __defProp = Object.defineProperty;
var __markAsModule = (target) => __defProp(target, "__esModule", { value: true });
var __export = (target, all) => {
  __markAsModule(target);
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};

__export(exports, {
  dec: () => dec,
  foo: () => foo,
  inc: () => inc
});
var foo = 1;
var inc = () => {
  return foo++;
};
function dec() {
  return foo--;
}

It uses var hoist and value getter to achieve a cleaner result.
It does not require manually sync variable assignment to exports.
I don't know if it is any different from spec behavior.

[kdy1]

I love the idea, but we should check the specification

[magic-akari]

Some useful information

• https://sokra.github.io/interop-test/