import('test-module').then(() => (
  import('test-module-2');
));

const a = /^\p{Decimal_Number}+$/u;
const b = /\p{Script_Extensions=Greek}/u;

let re = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/u;

let result = re.exec('2015-01-02');
// result.groups.year === '2015';
// result.groups.month === '01';
// result.groups.day === '02';

// result[0] === '2015-01-02';
// result[1] === '2015';
// result[2] === '01';
// result[3] === '02';

/./s; // /[\0-\uFFFF]/;

class Bork {
  instanceProperty = "bork";
  boundFunction = () => {
    return this.instanceProperty;
  }

  static staticProperty = "babelIsCool";
  static staticFunction = function() {
    return Bork.staticProperty;
  }
}

@frozen class Foo {
  @configurable(false) @enumerable(true) method() {}
}
function frozen(constructor, parent, elements) {
  return {
    constructor,
    elements,
    finisher(constructor) {
      Object.freeze(constructor.prototype)
      Object.freeze(constructor)
    }
  }
}
function configurable(configurable) {
  return decorator;
  function decorator(previousDescriptor) {
    return {
      ...previousDescriptor,
      descriptor: {
        ...previousDescriptor.descriptor,
        configurable
      }
    }
  }
}
function enumerable(enumerable) {
  return decorator;
  function decorator(previousDescriptor) {
    return {
      ...previousDescriptor,
      descriptor: {
        ...previousDescriptor.descriptor,
        enumerable
      }
    }
  }
}

export * as ns from 'mod'; // export-ns-from
export v from 'mod'; // export default from

obj?.prop       // optional property access
obj?.[expr]     // optional property access
func?.(...args) // optional function or method call

a?.b = 42; // a == null ? undefined : a.b = 42;

let a = do {
  if (x > 10) {
    'big';
  } else {
    'small';
  }
};

// let a = x > 10 ? 'big' : 'small';

// Decimal Literals
let budget = 1_000_000_000_000;
// Binary Literals
let nibbles = 0b1010_0001_1000_0101;
// Hex Literal
let message = 0xA0_B0_C0;

obj::func
// is equivalent to:
func.bind(obj)

obj::func(val)
// is equivalent to:
func.call(obj, val)

::obj.func(val)
// is equivalent to:
func.call(obj, val)

function* generator() {
  console.log("Sent", function.sent);
  console.log("Yield", yield);
}

const iterator = generator();
iterator.next(1); // Logs "Sent 1"
iterator.next(2); // Logs "Yield 2"

1n // integer
0b101n // binary
0xFF123n // hex
0o16432n // octal
9223372036854775807n // larger than floating

// Invalid
1.0n // no decimals
2e9n // no exponential notation
016n // no old octal

import.meta.url;
import.meta.scriptElement.dataset.size;

const length = vector => {
  case (vector) {
    when { x, y, z } -> return Math.sqrt(x ** 2 + y ** 2 + z ** 2)
    when { x, y } ->   return Math.sqrt(x ** 2 + y ** 2)
    when [...etc] ->     return vector.length
  }
}

const isVerbose = config => {
   case (config) {
    when {output: { verbose: true }} -> return true
    when config -> return false
    }
}

const res = await fetch(jsonService)
case (res) {
  when {status: 200, headers: {'Content-Length': s}} ->
    console.log(`size is ${s}`)
  when {status: 404} ->
    console.log('JSON not found')
  when {status} if (status >= 400) -> {
    throw new RequestError(res)
  }
}

()=>*{}