import { NgxQrcodeStylingComponent, Options } from 'ngx-qrcode-styling';

export class AppComponent {
    @ViewChild('qrcode', { static: false }) public qrcode!: NgxQrcodeStylingComponent;

    onUpdate(): void {
        this.qrcode.update(this.qrcode.config, {
          // height: 300,
          // width: 300,
          frameOptions: {
            height: 600,
            width: 600,
          },
          ...
        }).subscribe((res) => {
          // TO DO something!
        });
    }
    
    onDownload(): void {
        this.qrcode.download("file-name.png").subscribe((res) => {
          // TO DO something!
        });
    }
}

import { NgxQrcodeStylingService, Options } from 'ngx-qrcode-styling';

export class AppComponent implements AfterViewInit {
    @ViewChild("canvas", { static: false }) canvas: ElementRef;
    public config: Options = {...};
    
    constructor(private qrcode: NgxQrcodeStylingService) {}

    ngAfterViewInit(): void {
        // Create QRCode by Service and ElementRef 
        this.qrcode.create(this.config, this.canvas.nativeElement).subscribe((res) => {
          // TO DO something!
        });
    }
}

import { NgxQrcodeStylingService, Options } from 'ngx-qrcode-styling';

export class AppComponent implements AfterViewInit {
    public config: Options = {...};
    
    constructor(private qrcode: NgxQrcodeStylingService) {}
   
    ngAfterViewInit(): void {
        // Create QRCode by Service and HTMLElement 
        this.qrcode.create(this.config, document.getElementById('canvas')).subscribe((res) => {
          // TO DO something!
        });
    }
}

import { Options } from 'ngx-qrcode-styling';

export class AppComponent {
    public config: Options = {
        template: 'bitcoin',
        ...
    }
}

import { Options } from 'ngx-qrcode-styling';

export class AppComponent {
    public config: Options = {
        frameOptions: {
              style: 'F_036',
              width: 300,
              height: 300,
              x: 50,
              y: 50
        }
        ...
    }
}

export declare type Options = {
    type?: DrawType;
    shape?: ShapeType;
    width?: number;
    height?: number;
    margin?: number;
    data?: string;
    image?: string;
    scale?: number;
    rotate?: number;
    template?: string;
    frameOptions?: {
        style?: string;
        height?: number;
        width?: number;
        x?: number;
        y?: number;
        texts?: UnknownObject[]; // SVG Attribute reference
        contents?: UnknownObject[]; // SVG Attribute reference
        containers?: UnknownObject[]; // SVG Attribute reference
    };
    qrOptions?: {
        typeNumber?: TypeNumber;
        mode?: Mode;
        errorCorrectionLevel?: ErrorCorrectionLevel;
    };
    imageOptions?: {
        hideBackgroundDots?: boolean;
        imageSize?: number;
        crossOrigin?: string;
        margin?: number;
    };
    dotsOptions?: {
        type?: DotType;
        color?: string;
        gradient?: Gradient;
    };
    cornersSquareOptions?: {
        type?: CornerSquareType;
        color?: string;
        gradient?: Gradient;
    };
    cornersDotOptions?: {
        type?: CornerDotType;
        color?: string;
        gradient?: Gradient;
    };
    backgroundOptions?: {
        round?: number;
        color?: string;
        gradient?: Gradient;
    };
};