quoteStyle should include backtick

[Pomax]

quoteStyle should not be "either single or double", it should be either single, double, or backtick. Biome can be opinionated, but it should never disallow valid JS from being linted as valid.

[pratikrath126]

Hey! That's a fair point, but the reason Biome's quoteStyle doesn't include backticks is intentional: backticks create template literals, not plain strings. They have different semantics (interpolation, multi-line) and are usually formatted differently (no conversion between quotes). Biome treats them as a separate category; the quoteStyle rule only governs string literals (' vs ").

If you want template literals to be used, you can just write them naturally— Biome won't try to convert them to regular strings. If you're concerned about consistency, you might want a separate rule like no-unused-template-string or something. But the current design keeps the two concepts distinct, which is why you won't see backticks as an option in quoteStyle.

You could propose a new rule that enforces/ disallows template literal usage if that's what you need. Hope that explains the reasoning!

[Pomax]

That reasoning is... just incorrect with respect to JS: if there is no leading tag, and there is no templating syntax (${...}) inside them, then templating syntax is string primitive syntax, and they count as regular string (including for JIT shaping). Don't let their name fool you: they are 100% valid syntax for plain string primitives, in the same way that import is a keyword and a function: depending on the decorations, it's either, and depending on the decorations, backtick strings are either templating strings, or string primitives. Claiming they're only one of those is being factually incorrect (and linting is all about being factually correct)