salix/print/templates/reports/previa-label/previa-label.js

const Component = require(`vn-print/core/component`);
const reportBody = new Component('report-body');
const qrcode = require('qrcode');
const UserError = require('vn-loopback/util/user-error');

module.exports = {
    name: 'previa-label',
    async serverPrefetch() {
        this.previa = await this.fetchPrevia(this.id);
        this.sector = await this.fetchSector(this.id);
        this.barcode = await this.getBarcodeBase64(this.id);

        if (this.previa)
            this.previa = this.previa[0];

        if (!this.sector)
            throw new UserError('Something went wrong - no sector found');
    },
    methods: {
        fetchPrevia(id) {
            return this.findOneFromDef('previa', [id]);
        },
        getBarcodeBase64(id) {
            const data = String(id);

            return qrcode.toDataURL(data, {margin: 0});
        },
        fetchSector(id) {
            return this.findOneFromDef('sector', [id]);
        }
    },
    components: {
        'report-body': reportBody.build()
    },
    props: {
        id: {
            type: Number,
            required: true,
            description: 'The saleGroupFk id'
        },
    }
};