timse

// somewhere in the vendor.0da51f051fcf235d7027.js
// ...
chunkId + "." + {"0":"91022729b32987083f0d"}[chunkId]
// ...

timse

// webpack.config.js 
// ... 
plugins: [ 
  // ... 
  new webpack.optimize.CommonsChunkPlugin({ 
    name: ['runtime'] 
  }) 
]

timse

                          Asset       Size  Chunks             Chunk Names
 vendor.634878b098e5c599febd.js    20.7 kB       0  [emitted]  vendor
   main.d59c6ff3126e3943c563.js  538 bytes       1  [emitted]  main
runtime.25ce0c546aab71f8eac5.js    5.92 kB       2  [emitted]  runtime
   [0] ./~/preact/dist/preact.js 20.5 kB {0} [built]
   [1] ./src/foo.js 93 bytes {1} [built]
   [2] multi preact 28 bytes {0} [built]

timse

// foo.js
import bar from './bar';
// ...

timse

                          Asset       Size  Chunks             Chunk Names
   main.cec87b856171489c2719.js  811 bytes       0  [emitted]  main
 vendor.73db375ed475c718163f.js    20.7 kB       1  [emitted]  vendor
runtime.93b41beba42ebff23af0.js    5.92 kB       2  [emitted]  runtime
   [0] ./~/preact/dist/preact.js 20.5 kB {1} [built]
   [1] ./src/bar.js 23 bytes {0} [built]
   [2] ./src/foo.js 118 bytes {0} [built]
   [3] multi preact 28 bytes {1} [built]

timse

// weback.config.js 
// ... 
plugins: [ 
  new webpack.NamedChunksPlugin(), 
  // ... 
// ...

timse

// old vendor build
// ...
/***/ }),
/* 1 */,
/* 2 */
/***/ (function(module, exports, __webpack_require__) {
// ...


// vendor build with new import

timse

// webpack.config.js 
// ... 
plugins: [ 
  new webpack.NamedModulesPlugin(), 
  // ... 
// ...

timse

// output without bar.js

                          Asset       Size   Chunks             Chunk Names
   main.5f15e6808c8037c8bdbc.js  628 bytes     main  [emitted]  main
runtime.72ef2fc7d9df236c7f1c.js    5.94 kB  runtime  [emitted]  runtime
 vendor.73c86187abcdf9fd7b18.js    20.7 kB   vendor  [emitted]  vendor
[./node_modules/preact/dist/preact.js] ./~/preact/dist/preact.js 20.5 kB {vendor} [built]
   [0] multi preact 28 bytes {vendor} [built]
[./src/foo.js] ./src/foo.js 121 bytes {main} [built]

timse

// foo.js
import('./async-bar').then( a => console.log(a));
// ...