output.js

var _computedKey, _initProto;

const dec = () => {};

_computedKey = 'b';

class Foo {
  constructor(...args) {
    babelHelpers.defineProperty(this, "value", 1);

    _initProto(this);
  }

  set a(v) {
    return this.value = v;
  }

  set [_computedKey](v) {
    return this.value = v;
  }

}

[_initProto] = babelHelpers.applyDecs(Foo, [[dec, 4, "a"], [dec, 4, _computedKey]], []);