feat: astro2tsx with biome

crates/astro2tsx/Cargo.toml

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+[package]
+name                 = "astro2tsx"
+version              = "0.1.0"
+authors.workspace    = true
+edition.workspace    = true
+license.workspace    = true
+repository.workspace = true
+rust-version.workspace = true
+publish              = false
+description          = "Converts .astro files to .tsx for tsserver intellisense, using Biome's HTML CST"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+test       = true
+doctest    = false
+
+# Path deps into a sibling Biome checkout. Cargo follows the path into
+# Biome's own workspace, so the `workspace = true` deps inside each
+# Biome crate resolve from `../../../biome/Cargo.toml`. Switch to git
+# deps once the Astro-specific lexer changes (template-literal attribute
+# values) land in a published Biome version.
+[dependencies]
+biome_html_parser = { path = "../../../biome/crates/biome_html_parser" }
+biome_html_syntax = { path = "../../../biome/crates/biome_html_syntax" }
+biome_js_parser   = { path = "../../../biome/crates/biome_js_parser" }
+biome_js_syntax   = { path = "../../../biome/crates/biome_js_syntax" }
+biome_rowan       = { path = "../../../biome/crates/biome_rowan" }
+
+napi        = { workspace = true }
+napi-derive = { workspace = true }
+
+[dev-dependencies]
+serde      = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+[build-dependencies]
+napi-build = { workspace = true }

crates/astro2tsx/build.rs

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+fn main() {
+    napi_build::setup();
+}

crates/astro2tsx/index.d.ts

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+/* auto-generated by NAPI-RS */
+/* eslint-disable */
+/**
+ * Convert an Astro source file to TSX for tsserver intellisense.
+ *
+ * The conversion is error-tolerant: malformed input produces a
+ * best-effort TSX output rather than throwing, and `hasParseErrors` is
+ * set to `true` when the parser surfaced one or more diagnostics.
+ */
+export declare function convertToTsx(source: string, options?: ConvertToTsxOptions | undefined | null): ConvertToTsxResult
+
+/** Options recognised by `convertToTsx`. */
+export interface ConvertToTsxOptions {
+  /**
+   * Filename used to derive the default-exported component identifier
+   * (e.g. `MyPage.astro` produces `MyPage__AstroComponent_`). Optional.
+   */
+  filename?: string
+}
+
+/** Result of converting an Astro source to TSX. */
+export interface ConvertToTsxResult {
+  code: string
+  mappings: Array<Mapping>
+  frontmatter: GeneratedRange
+  body: GeneratedRange
+  scripts: Array<ExtractedTag>
+  styles: Array<ExtractedTag>
+  hasParseErrors: boolean
+}
+
+export interface ExtractedTag {
+  range: GeneratedRange
+  kind: ExtractedTagKind
+  content: string
+  lang?: string
+}
+
+export declare const enum ExtractedTagKind {
+  Script = 'Script',
+  Style = 'Style',
+  StyleAttribute = 'StyleAttribute',
+  EventAttribute = 'EventAttribute'
+}
+
+/**
+ * Byte range inside the generated TSX. Used to mark the frontmatter
+ * section, the body section, and each extracted script / style block.
+ */
+export interface GeneratedRange {
+  start: number
+  end: number
+}
+
+/**
+ * Per-byte source-position mapping. JS consumers can iterate this list
+ * to build a VLQ-encoded sourcemap or to translate offsets between the
+ * emitted TSX and the original `.astro` source.
+ */
+export interface Mapping {
+  /** Byte offset into the generated TSX. */
+  generated: number
+  /**
+   * Byte offset into the original `.astro` source. `None` for synthetic
+   * content (e.g. the `<Fragment>` wrapping or the prefix comment).
+   */
+  original?: number
+}