Stimulsoft have a reports.js option which seems to be applicable/suited for node.js and angularjs [stimulsoft.com/en/products/reports-js]

Hi @Mawg we are looking for free or paid solution (no fixed budget in mind). The reports we need range from charts to lists, to custom reports such as invoices... The exports options required are the most popular ones as you mentionned (PDF, XLS, CSV, Word, ...)