typescript - Efter uppgradering från Angular 5 till Angular 6: Det aktuella dokumentet har ingen doctype

Jag uppgraderade precis mitt Angular 5-projekt till Angular 6. Efter uppgraderingen kompileras det utan problem, men webbplatsen visas tom. I konsolen får jag:

  
Current document does not have a doctype. This may cause some Angular Material components not to behave as expected.
  push../node_modules/@angular/material/esm5/core.es5.js.MatCommonModule._checkDoctypeIsDefined @   core.es5.js:127
  MatCommonModule   @   core.es5.js:92
  _createClass  @   core.js:8116
  createProviderInstance$1 @   core.js:8088 initNgModule   @   core.js:8024 NgModuleRef   @   core.js:8747 createNgModuleRef  @   core.js:8736
  debugCreateNgModuleRef    @   core.js:10561
  push../node_modules/@angular/core/fesm5/core.js.NgModuleFactory_.create   @   core.js:11263
  (anonymous)   @   core.js:4161
  push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke  @   zone.js:388
  onInvoke  @   core.js:3671
  push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke  @   zone.js:387
  push../node_modules/zone.js/dist/zone.js.Zone.run @   zone.js:138
  push../node_modules/@angular/core/fesm5/core.js.NgZone.run    @   core.js:3585
  push../node_modules/@angular/core/fesm5/core.js.PlatformRef.bootstrapModuleFactory    @   core.js:4159
  (anonymous)   @   core.js:4200
  push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke  @   zone.js:388
  push../node_modules/zone.js/dist/zone.js.Zone.run @   zone.js:138
  (anonymous)   @   zone.js:872
  push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask  @   zone.js:421
  push../node_modules/zone.js/dist/zone.js.Zone.runTask @   zone.js:188
  drainMicroTaskQueue   @   zone.js:595 Promise.then (async)

  scheduleMicroTask @   zone.js:578
  push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask    @   zone.js:410
  push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask    @   zone.js:232
  push../node_modules/zone.js/dist/zone.js.Zone.scheduleMicroTask   @   zone.js:252
  scheduleResolveOrReject   @   zone.js:862
  ZoneAwarePromise.then @   zone.js:962
  push../node_modules/@angular/core/fesm5/core.js.PlatformRef.bootstrapModule   @   core.js:4200
  ./src/main.ts @   main.ts:12
  webpack_require   @   bootstrap:76 0  @   main.ts:13
  webpack_require   @   bootstrap:76 checkDeferredModules   @   bootstrap:43 webpackJsonpCallback   @   bootstrap:30 (anonymous)

  
  
TypeError: Cannot read property 'appendChild' of null
      at MatCommonModule.push../node_modules/@angular/material/esm5/core.es5.js.MatCommonModule._checkThemeIsPresent
  (core.es5.js:141)
      at new MatCommonModule (core.es5.js:93)
      at _createClass (core.js:8116)
      at createProviderInstance$1 (core.js:8088)
      at initNgModule (core.js:8024)
      at new NgModuleRef (core.js:8747)
      at createNgModuleRef (core.js:8736)
      at Object.debugCreateNgModuleRef [as createNgModuleRef] (core.js:10561)
      at NgModuleFactory_.push../node_modules/@angular/core/fesm5/core.js.NgModuleFactory_.create
  (core.js:11263)
      at core.js:4161

Är det något fel på @angular/material, eller uppgraderades något inte korrekt i projektet?

Om det finns något jag kan tillägga för att hjälpa till att diagnostisera, låt mig veta.

Svar #1

Om du vill ta bort denna varning, lägg bara till en Doctype högst upp i din allmänna index.html-fil, så här:

<!doctype html>
<html lang="en">
<head>
  ...
</html>

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