babeljs transpilation - demo snippets: before: simple, after: complex

babeljs-examples-small-but-weird.js

// this simple snippet will moderately  complex after transpiling 
// https://babeljs.io/repl#?babili=false&browsers=safari%20%3E%209&build=&builtIns=false&spec=false&loose=false&code_lz=G4QwTgBA2iA0BQEnKQIwgXggFgEyxQgHoiIBiCAEwFMAzEAVwBsAXCUJh6gZwEIIAFAEtaEagFsADiwCeEAPaQGAOxq0hy6pQXKIAJQASAZQCUiQkgDGCCwDp74AObd4AXUwRa8-QJMQAPv7QEK4A3BDwQA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env&prettier=false&targets=&version=6.26.0&envVersion=1.6.2
var [a,
        b = 42,     // default values! (if empty or undefined on RHS)
        c,
      ...args
] = foo() || [ ]; 

// 
function foo(){
    return [1,2,3, [4,5,6]];
}

// ... but this simple snippet will become incredibly complex after transpiling 
// https://babeljs.io/repl#?babili=false&browsers=safari%20%3E%209&build=&builtIns=false&spec=false&loose=false&code_lz=GYVwdgxgLglg9mABMOcAUBKA3gKEfxAJwFMoRCkBtARgBoAmWgZlsUoBZaBWWgNgF1-AbhwBfHDgBuAQ0KJptAEa0ItWQHMAzqwAmtYiJyU8BBSfyKAvInaNziVfcp77te8Xv8c_RNZToMISA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env&prettier=false&targets=&version=6.26.0&envVersion=1.6.2
var a,b,c,args, d,e;

[
    a,
    b= 42,
    c,
    [d,
    ,
    e
    ]
] = foo();



// ########## another boost of complexity by transpilation
// https://babeljs.io/repl#?babili=false&browsers=safari%20%3E%209&build=&builtIns=false&spec=false&loose=false&code_lz=IYZwngdgxgBAZgV2gFwJYHsL3egFADwEoYBvAKBhgDdgAnGMGAXhmAHdhVkZ8KYpMIdABsApgDph6AOa4whMgF8gA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env&prettier=false&targets=&version=6.26.0&envVersion=1.6.2
async function foo(x) {
  var y = await x
  console.log(y)
}