How to use the mustache/mustache.js.render function in mustache

this._getExportListContent(listIndex,entriesChunk) +
                                this._getExportPageFooter(currentPage,totalPages,oaData.oa.code)
                        });
                    })
                })

                // Close document
                pdfTemplate += this._getExportPdfFooter();

                this._setLoadingMessage({ message:this.localize('mhListing.spinner.step_5_done',this.language), icon:"check-circle", updateLastMessage: true, done:true});
                this._setLoadingMessage({ message:this.localize('mhListing.spinner.step_6',this.language), icon:"arrow-forward"});

                this.downloadFileName = this.reportCurrentDateMomentObject.format('YYYY-MM-DD-HH[h]-mm[m]-ss[s]') + "-listing-patients" + ".pdf";

                // Generate, archive & download pdf report
                this.api.pdfReport(mustache.render(pdfTemplate, pdfData))
                    .then(pdfFileContent=>{
                        this._setLoadingMessage({ message:this.localize('mhListing.spinner.step_6_done',this.language), icon:"check-circle", updateLastMessage: true, done:true});
                        this._setLoadingMessage({ message:this.localize('mhListing.spinner.step_7',this.language), icon:"arrow-forward"});

                        return this.api.message().newInstance(this.user)
                            .then(newMessageInstance => this.api.message().createMessage(
                                _.merge(newMessageInstance, {
                                    transportGuid: "MH:ARCHIVES:LISTING",
                                    recipients: [_.get(this.user, 'healthcarePartyId', _.trim(this.hcp.id))],
                                    metas: {totalPages: totalPages, filename: this.downloadFileName},
                                    toAddresses: [_.get(this.user, 'email', _.get(this.user, 'healthcarePartyId', _.trim(this.hcp.id)))],
                                    subject: "MH: Archive listing patients download - " + this.downloadFileName
                                }))
                            )
                            .then(createdMessage => this.api.document().newInstance(this.user, createdMessage, {
                                documentType: 'report',

title: data.title,
		byline: data.byline,
		date: (new Date(data.publication_year, data.publication_month, data.publication_day)).toLocaleDateString(),
		body: data.body,
		url: data.url
	};

	if(data.small_image_url){
		templateData.image = {
			src: data.small_image_url.replace(/thumbStandard.*\./, "hpMedium."),
			height: 253,
			width: 337
		};
	}

	element.innerHTML = mustache.render(ARTICLE_TEMPLATE, templateData);
	document.body.appendChild(element);

	this.markResource(data.title);
	
	setTimeout(function(){
		element.width = element.clientWidth;
		element.height = element.clientHeight;

		documentFragment.appendChild(element);
		self.addResource(data.title, new StaticElement(element));
	});
};

_pdfReport(drugsToBePrescribed,toPrint,size) {

                this.dispatchEvent(new CustomEvent('pdf-report',{detail: {loading: true}}))

                const pdfPrintingData = {
                    downloadFileName: _.kebabCase([ "prescription", _.get(this.patient, "lastName", ""), _.get(this.patient, "firstName", ""), +new Date()].join(" ")) + ".pdf",
                    documentMetas : {
                        title : "Prescription",
                        contactId : _.get(this.currentContact, "id", ""),
                        created: ""+ +new Date(),
                        patientId : _.trim(_.get(this.patient, "id", "")),
                        patientName : _.compact([ _.get(this.patient, "lastName", ""), _.get(this.patient, "firstName", "") ]).join(" ")
                    }
                }

                this.api.pdfReport(mustache.render(toPrint, null), {
                    paperWidth: this.patient.ssin && this.api.tokenId && size == 'A4' ? 210 : 105,
                    paperHeight: this.patient.ssin && this.api.tokenId && size == 'A4' ? 297 : 210,
                    marginLeft: 5,
                    marginRight: 5,
                    marginTop: 5,
                    marginBottom: 5
                })
                .then(({pdf:pdfFileContent, printed:wasPrinted}) => _.assign({pdfFileContent:pdfFileContent, printed:wasPrinted}, pdfPrintingData))
                .then(pdfPrintingData => this.api.message().newInstanceWithPatient(this.user, this.patient)
                    .then(newMessageInstance=>_.assign({newMessageInstance: newMessageInstance}, pdfPrintingData))
                    .then(pdfPrintingData=>this.api.message().createMessage(
                            _.merge(
                                pdfPrintingData.newMessageInstance,
                                {
                                    transportGuid: "PRESCRIPTION:PHARMACEUTICALS:ARCHIVE",
                                    recipients: [_.get(this.user, 'healthcarePartyId', _.trim(this.user.id))],