using new.target-style syntax for providing metadata and relative dynamic import to modules

1-import-meta.js

// import default export
import.default("Spinner").then(Spinner => {
  widget.appendChild(new Spinner(...))
});

// import namespace object
import.namespace("fs").then(fs => {
  fs.readFile(...)
});

// import local metadata
import.metadata.filename
import.metadata.address

2-import-meta-batch.js

// import default export
import.default(["Spinner", "Slider", "Gallery"]).then([Spinner, Slider, Gallery] => {
  ...
});
// vs
Promise.all(["Spinner", "Slider", "Gallery"].map(import.default)).then([Spinner, Slider, Gallery] => {
  ...
});

// import namespace object
import.namespace(["fs", "util", "collections"]).then([fs, util, collections] = {
  ...
});
// vs
Promise.all(["fs", "util", "collections"].map(import.namespace)).then([fs, util, collections] => {
  ...
})