☂️ YAML support

[ematipico]

Description

Some members of our community expressed interest in developing YAML support inside Biome.

This umbrella issue is meant to track its progress and coordination among the members who want to help to see this coming to fruition.

Core tasks to implement:

• [ ] Craft the grammar
• [ ] Develop a tokenizer
• [ ] Develop a parser
• [ ] Add benchmarks
• [ ] Implement the formatting (prettier compatible)
• [ ] Implement at least one rule

[!IMPORTANT] This feature won't be developed by core contributors, but it will be implemented by volunteers

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[castarco]

I'd like to work on this one.

I'll probably prioritize the "readonly" operations (detecting problems) over formatting and autofixes, though (I'll implement more than one "validation" rule before jumping into the formatter).

[Netail]

As mentioned in Discord; I could give it a try and help a tiny bit as I am new to Rust. Wouldn't necessarily assign me, but will try to help here and there.

[ematipico]

This page should provide some introduction on how to create a parser inside Biome: https://github.com/biomejs/biome/blob/main/crates/biome_parser/CONTRIBUTING.md

[defnot001]

Hey, I would like to try and work on this too as pointed out in discord! 😃

[castarco]

For reference, the "real time" discussion is happening here: https://discord.com/channels/1132231889290285117/1226946071196991569

[dyc3]

I've opened a PR with a more comprehensive yaml grammar that should unblock creating a lexer: #3400

[dyc3]

I also took a stab at a lexer in #3430