If it'd be node there'd be some solution I know, but in vanilla js you might consider Lazy.js. Should work for you. Source: over 3 years ago

JavaScript provides built-in methods like toFixed() for number formatting, as well as libraries like numeral.js, which provides advanced formatting options. These methods and libraries can be used to format numbers in a variety of ways, including currency, percentages, and time. It's important to note that the way numbers are formatted can vary depending on the locale and currency, so it's important to be mindful... - Source: dev.to / over 2 years ago

The `a` at the end handles automatically shortening it. See the last example in [the docs for numeraljs](http://numeraljs.com/) under the "Format > Currency" section. Source: almost 3 years ago

Long answer: The format part of tprintf roughly follows sprintf-js and the numbers are formatted using ns.nFormat which uses the syntax from numeraljs.com. Source: over 3 years ago

However, there are always great libraries that the community develops to support missing features, such as dinero.js, currency.js, and numeral.js. - Source: dev.to / over 3 years ago