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I am also facing same issue ERROR ReferenceError: **hljs is not defined** at highlight-js-content.directive.js:23 at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:388) at Zone.push../node_modules/zone.js/dist/zone.js.Zone.run (zone.js:138) at NgZone.push../node_modules/@angular/core/fesm5/core.js.NgZone.runOutsideAngular (core.js:3716) at HighlightJsContentDirective.push../node_modules/angular2-highlight-js/lib/highlight-js-content.directive.js.HighlightJsContentDirective.ngAfterViewChecked (highlight-js-content.directive.js: