Check the MIME type of file before upload it

import { Component, ViewChild, ViewEncapsulation } from '@angular/core';
import { EmitType } from '@syncfusion/ej2-base';
import { UploaderComponent, SelectedEventArgs  } from '@syncfusion/ej2-angular-inputs';
@Component({
    selector: 'app-container',
    templateUrl: 'default.html',
    styleUrls: ['index.css'],
    encapsulation: ViewEncapsulation.None
})

export class AppComponent {
    @ViewChild('defaultupload')
    public uploadObj: UploaderComponent;
    public autoUpload: boolean = false;
    public path: Object = {
        saveUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
        removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove'
    };
    public onBeforeUpload: EmitType<Object> = (args: any) => {
        // get the file MIME type
        alert("File MIME type is: " + args.fileData.rawFile.type)
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { UploaderModule } from '@syncfusion/ej2-angular-inputs';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,FormsModule, UploaderModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule {
}

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

<div class="control-section">
    <div class="control_wrapper">          
        <ejs-uploader #defaultupload id='fileupload' [asyncSettings]='path' [autoUpload]='autoUpload' (uploading)='onBeforeUpload($event)' ></ejs-uploader>
    </div>
</div>