There was a previous issue
#462
described adding borders to individal paragraphs via the example at
https://github.com/dolanmiu/docx/blob/master/demo/26-paragraph-borders.ts

I wanted to add borders to paragraph styles and did not see support for this.
I made the following changes,

class ParagraphStyle extends style_1.Style {
    constructor(options) {
        super({ type: "paragraph", styleId: options.id }, options.name);
       // <--- START CHANGE
        if (options.paragraph && options.paragraph.border)
        	{
        	this.paragraphProperties = new paragraph_1.ParagraphProperties(options.paragraph);
        	}
        else // END CHANGE --->
        	this.paragraphProperties = new paragraph_1.ParagraphProperties({});
	...

The regular border options are passed in as shown below
paragraphStyleOptions.paragraph.border = the border options...