system-config.ts

/** Map relative paths to URLs. */
const map: any = {
  '@angular2-material': 'vendor/@angular2-material'
};

/** User packages configuration. */
const materialPackages:string[] = [
'core',
'button'
];

const packages:any = createCustomConfig(materialPackages);

function createCustomConfig(packages: string[]): any {
  return packages.reduce((packageConfig: any, packageName: string) => {
    packageConfig[`@angular2-material/${packageName}`] = {
      format: 'cjs',
      defaultExtension: 'js',
      main: packageName
    };
    return packageConfig;
  }, {});
};