// The text contains the static text, flags and variables
// The variables should follow this form: {variable_name}
// The flags should follow this form: [flag_name>The text contained in the flag]
// In addition to your manually defined flags, for each variable var_name, a flag has:var_name will be added
// automatically and set to whether the variable is set and non-empty.
const templateText = "Here is a wonderful template.[flag_1> I don't want this to be printed out.][has:webpage>\nCheck out the {webpage} website!]\n[flag_2>I want this to be printed out.]";

// You should map the flag_name used in the template text with their visibilities (Boolean)
const flags = { flag_1: false, flag_2: true };

// You should map the variable_name used in the template text with their values
const variables = { webpage: 'Datenanfragen.de' };

// Create the template from our values and generate the output text as string
const template = new Template(templateText, flags, variables);
console.log(template.getText());
// Here is a wonderful template.
// Check out the Datenanfragen.de website!
// I want this to be printed out.

const props = {
    // The sender address, either as a string or as an array of the individual lines.
    sender_address: ['Jane Doe', '123 Some Lane', '12345 Some City', 'Some Country'],

    // The recipient address, individual or array
    recipient_address: ['John Doe', '667 One Street', '98765 Another City', 'A Country'],  

    // The information block usually displayed at the top-right of the letter. Can either be a string, a string[] or anything recognized by pdfmake.
    information_block: 'A block of information',

    // The Letter subject
    // In this case we use the text generated with the template but you can use a string
    subject: content,

    // The content of the letter. Can either be a string or anything recognized by pdfmake.
    content: 'Content of my letter',

    // OPTIONAL
    // The signature to be included after the content.
    signature: { type: 'text', name: 'Name' } // To just add the name
        //{ type: 'image', name: 'Name', value: '<BASE64 ENCODED IMAGE>'} to include an image with the name underneath
}

// Use default layout
const letter = new Letter(props);

// You can also give the letter a function that returns a pdfmake layout as second parameter:
const letter_with_layout = new Letter(props, layout_function);

const render = new PdfRenderer(letter);
render.triggerOpenInNewWindow();
render.triggerDownload();