'Global name' feature could use more concise syntax

[eligrey]

In the docs, it's noted that echo 'module.exports = "test"' | esbuild --format=iife --global-name='example.versions["1.0"]' produces the following output:

var example = example || {};
example.versions = example.versions || {};
example.versions["1.0"] = (() => {
  ...
  var require_stdin = __commonJS((exports, module) => {
    module.exports = "test";
  });
  return require_stdin();
})();

This feature could use logical nullish assignment for more concise syntax:

var example;
((example ??= {}).versions ??= {})["1.0"] = (() => {
  ...
  var require_stdin = __commonJS((exports, module) => {
    module.exports = "test";
  });
  return require_stdin();
})();