How Webpack create final asset

how-webpack-create-final-asset.js

// iife
(function(moduleArray) {
  var cache = {};
  function webpackRequire(index) {
    if (cache[index]) {
      return cache[index];
    }
    
    var module = { exports: {} };
    var file = moduleArray[index];
    file(module, webpackRequire);
    
    cache[index] = module.exports;
    
    return module.exports;
  }
  
  return webpackRequire(0);
})(
  // All the dependencies here:
  [
    function(module, webpackRequire){
      var hypotenuse = webpackRequire(1);
      console.log(hypotenuse(3,4));
    },
    function(module, webpackRequire) {
      var square = webpackRequire(2);
      module.exports = function(a, b) {
        return Math.sqrt(square(a) + square(b));
      }
    },
    function(module, webpackRequire){
      module.exports = function(x) {
        return x * x;
      }
    }
  ]
);