Webpack 原理

function bundle(graph: Graph): string {
    let modules = '';
  
    graph.forEach(mod => {
      modules += `${mod.id}: [
        function (require, module, exports) {
          ${mod.code}
        },
        ${JSON.stringify(mod.mapping || {})},
      ],`;
    });
  
    const result = dedent`
      (function(modules) {
        function require(id) {
          const [fn, mapping] = modules[id];
  
          function localRequire(name) {
            return require(mapping[name]);
          }
  
          const module = { exports : {} };
  
          fn(localRequire, module, module.exports);
  
          return module.exports;
        }
  
        return require(0);
      })({${modules}})
    `;
  
    return result;
  }