@tamagui/style-grammar

This package owns the shared parser and intermediate representation for Tamagui style value strings.

Runtime consumers must follow the repository's one-parse-per-unique-value constraint. Cache the parsed representation and extend it with structural predicates when a new consumer needs more information. Do not add a second string scanner beside the grammar.

The one scanner

scanFlatValue.ts is the split: one left-to-right pass that hands a handler index ranges and never allocates a slice. parseValue is built on it, and so are the three scanners in @tamagui/web (contributeStyleString, resolveVariants, hasFlatModifier). A consumer that needs a different answer writes a different handler, never a second pass.

The Rust LSP's tables are generated from here

code/lsp/crates/tamagui-grammar is an editor transport for this grammar and never a second owner of what a modifier means, so its modifier tables and its conformance vectors are generated:

bun run generate:rust   # write src/generated.rs and tests/vectors.json
bun run check:rust      # fail if what is on disk differs

checks.yaml runs check:rust and cargo test --workspace on every push. When you change a modifier name, an alias, a platform, or anything the parser decides, regenerate and commit both files with the change.