Prettier 2.8; RegExp flag /v; internationalizing numbers; rewrite of ESLint; realms

This release includes improvements to the --cache option added in 2.7. A new --cache-location option has been added, and a bug that saved the cache even when --write wasn't specified has been fixed.

We're also adding support for TypeScript 4.9 satisfies operator!

The proposed new regular expression flag /v (.unicodeSets) enables three features:

• Support for multi-code-point graphemes (such as some emojis) for character classes and Unicode property escapes (\p{}).
• Character classes can be nested and combined via the set operations subtraction and intersection.
• The flag also improves case-insensitive matching for negated character classes.

price.toLocaleString('de-DE', { 
  style: 'currency', 
  currency: 'EUR' 
}); // "16.601,91 €"  

Due to the rise of dependencies-based development, the JavaScript ecosystem [...] is far more vulnerable to what we know as “supply chain attacks” – and the ability to create new realms in JavaScript is being leveraged to successfully carry out such attacks against web apps [...].

The realms security field is far from being properly addressed, and I hope to gradually fix that starting by introducing the first open source realms security tool – Snow-JS [...].

But in order for any of this to make sense, we must first understand what realms are [...].