feat(bun): add runtime Transpiler and build subsets

Cargo.toml

@@ -365,6 +365,8 @@ swc_ecma_ast = "19.0"
 swc_ecma_visit = "19.0"
 swc_common = "18.0"
 swc_ecma_codegen = "21.0"
+swc_bundler = "37.0"
+swc_ecma_loader = "18.0"
 swc_ecma_transforms_base = "32.0"
 swc_ecma_transforms_react = "35.0"
 swc_ecma_transforms_typescript = "35.0"

changelog.d/9602-bun-runtime-compiler.md

@@ -0,0 +1,7 @@
+### Added
+
+- Added the native `Bun.Transpiler` and in-memory `Bun.build` subsets used by
+  runtime hook modules, including TypeScript/JSX lowering, import scanning,
+  external modules, and `onResolve`/`onLoad` plugin hooks. Build failures now
+  return useful filename and source-position logs instead of terminating the
+  process. (#9602)

crates/perry-api-manifest/src/entries/part_4.rs

@@ -1100,6 +1100,13 @@ pub(crate) const API_MANIFEST_PART_4: &[ApiEntry] = &[
     // (Zig-std wyhash, BigInt result), and the module-level
     // `pathToFileURL` / `fileURLToPath` aliases of node:url.
     // Implementation: perry-runtime `bun_compat`.
+    class("bun", "Transpiler"),
+    method("bun", "Transpiler", false, None),
+    method("bun", "build", false, None),
+    method("bun", "transformSync", true, Some("Transpiler")),
+    method("bun", "transform", true, Some("Transpiler")),
+    method("bun", "scanImports", true, Some("Transpiler")),
+    method("bun", "scan", true, Some("Transpiler")),
     method("bun", "stringWidth", false, None),
     method("bun", "hash", false, None),
     method("bun", "file", false, None),

crates/perry-codegen/src/ext_registry.rs

@@ -644,6 +644,9 @@ const EXT_PREFIX_REGISTRY: &[(&str, &str)] = &[
     ("js_node_forge_", "node-forge"),
     // Native runtime TypeScript transpilation subset (#8511).
     ("js_typescript_", "typescript"),
+    // Bun runtime transpilation/build subset shares the pinned SWC wrapper.
+    ("js_bun_transpiler_", "typescript"),
+    ("js_bun_build", "typescript"),
     ("js_qs_",         "qs"),
 ];
 

crates/perry-codegen/src/lower_call/builtin.rs

@@ -125,6 +125,7 @@ pub(super) fn lower_builtin_new<'a>(
         "Decimal" => Some(&["decimal.js"]),
         "RateLimiterMemory" => Some(&["rate-limiter-flexible"]),
         "CronJob" => Some(&["cron", "node-cron"]),
+        "Transpiler" => Some(&["bun"]),
         _ => None,
     };
     if let Some(sources) = required_sources {
@@ -133,6 +134,14 @@ pub(super) fn lower_builtin_new<'a>(
         }
     }
     match class_name {
+        "Transpiler" => {
+            let options = adopt_leading_arg_discard_rest(ctx, args, group)?;
+            ctx.pending_declares
+                .push(("js_bun_transpiler_new".to_string(), I64, vec![DOUBLE]));
+            let block = ctx.block();
+            let handle = block.call(I64, "js_bun_transpiler_new", &[(DOUBLE, &options)]);
+            Ok(Some(nanbox_pointer_inline(block, &handle)))
+        }
         "Resolver"
             if import_src.is_some_and(|source| {
                 matches!(