Debug breakpoints not hitting running Angular CLI 1.7.1 and Webstorm 2017.3.5

Breakpoints do not work with this setup. From the docs I've read, I believe all I need to do is add http://localhost:4200 to a JavaScript Debug Configuration, save and click Debug icon, but this doesn't work. Breakpoints do not get hit. Can you please help me get debugging working?

{
  "name": "pricing-portal",
  "version": "0.0.1",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    "build:dev": "ng build  --prod --environment=dev",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.2.9",
    "@angular/cdk": "^5.2.4",
    "@angular/common": "^5.2.9",
    "@angular/compiler": "^5.2.9",
    "@angular/core": "^5.2.9",
    "@angular/forms": "^5.2.9",
    "@angular/http": "^5.2.9",
    "@angular/material": "^5.2.4",
    "@angular/platform-browser": "^5.2.9",
    "@angular/platform-browser-dynamic": "^5.2.9",
    "@angular/router": "^5.2.9",
    "@okta/okta-angular": "^0.0.13",
    "@swimlane/ngx-datatable": "^11.2.0",
    "bootstrap": "^4.0.0",
    "core-js": "^2.4.1",
    "hammerjs": "^2.0.8",
    "rxjs": "^5.5.7",
    "web-animations-js": "^2.3.1",
    "zone.js": "^0.8.19"
  },
  "devDependencies": {
    "@angular/cli": "1.7.1",
    "@angular/compiler-cli": "^5.2.9",
    "@angular/language-service": "^5.2.9",
    "@types/jasmine": "~2.8.3",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "^6.0.102",
    "codelyzer": "^4.2.1",
    "jasmine-core": "~2.8.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~2.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "^1.4.2",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~4.1.0",
    "tslint": "~5.9.1",
    "typescript": "~2.5.3"
  }
}

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ]
  }
}