VS Code debugger, breakpoints doesn't work

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Attach with sourcemaps",
            "type": "chrome",
            "request": "attach",
            "port": 9222,
            "sourceMaps": true,
            "webRoot": "${workspaceRoot}"
        }
    ]
}

tsconfig.json

{
    "compilerOptions": {
        "outDir": "./dist/",
        "sourceMap": true,
        "noImplicitAny": true,
        "module": "commonjs",
        "target": "es5"
    },
    "files": [
        "./typings/index.d.ts",
        "./src/index.ts"
    ]
}

webpack.config.js

var webpack = require('webpack');
var PROD = (process.env.NODE_ENV === 'production')

module.exports = {
  entry: "./src/index.ts",
  output: {
    path: "./dist",
    publicPath: "/dist/",
    filename: PROD ? "bundle.min.js" : "bundle.js",
  },
  devtool: "source-map",
  resolve: {
    extensions: ["", ".webpack.js", ".web.js", ".ts", ".tsx", ".js"]
  },
  module: {
    loaders: [
      { test: /\.css$/, loader: "style!css" },
      { test: /\.tsx?$/, loader: "ts-loader" }
    ],
    preLoaders: [
      { test: /\.js$/, loader: "source-map-loader" }
    ]
  },
  externals: {} //unify import
};