Add support for Angular Universal

'document' is not available during Server Side Rendering.
By using the 'he' library we're no longer depending on the DOM
to exist, adding support for Angular Universal.

Modified by Dan Church <[email protected]>

Author: dirkgroenen

libs/ngx-md/src/lib/ngx-md.component.ts

@@ -13,6 +13,7 @@ import { isPlatformBrowser } from '@angular/common';
 import * as Prism from 'prismjs';
 import { Subscribable } from 'rxjs';
 import { catchError } from 'rxjs/operators';
+import { decode } from 'he';
 
 @Component({
   selector: 'markdown,[Markdown],ngx-md,[NgxMd]',
@@ -47,7 +48,7 @@ export class NgxMdComponent implements AfterViewInit {
     public _mdService: NgxMdService,
     public _el: ElementRef,
     @Inject(PLATFORM_ID) public platformId: string
-  ) {}
+  ) { }
 
   @Input()
   set path(value: string) {
@@ -95,7 +96,7 @@ export class NgxMdComponent implements AfterViewInit {
   }
 
   processRaw() {
-    this._md = this.prepare(decodeHtml(this._el.nativeElement.innerHTML));
+    this._md = this.prepare(decode(this._el.nativeElement.innerHTML));
     this._el.nativeElement.innerHTML = this._mdService.compile(
       this._md,
       this.sanitizeHtml
@@ -176,10 +177,3 @@ export class NgxMdComponent implements AfterViewInit {
     }
   }
 }
-
-function decodeHtml(html: string) {
-  // https://stackoverflow.com/a/7394787/588521
-  const txt = document.createElement('textarea');
-  txt.innerHTML = html;
-  return txt.value;
-}

package.json

@@ -74,6 +74,7 @@
     "@angular/platform-browser-dynamic": "^8.2.14",
     "@angular/router": "^8.2.14",
     "core-js": "^3.6.0",
+    "he": "^1.2.0",
     "json-align": "^0.1.0",
     "lodash": "^4.17.15",
     "marked": "^0.7.0",

yarn.lock

@@ -5614,6 +5614,11 @@ [email protected]:
     is-stream "^2.0.0"
     type-fest "^0.8.0"
 
+he@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"
+  integrity sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==
+
 hmac-drbg@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"