feat: support json sources

Author: jbedard

e2e/smoke/WORKSPACE.bazel

@@ -29,3 +29,8 @@ swc_register_toolchains(
     name = "swc",
     swc_version = LATEST_SWC_VERSION,
 )
+
+# To use rules_swc with bazel-lib 2.x, you must additionally register the coreutils toolchain.
+load("@aspect_bazel_lib//lib:repositories.bzl", "register_coreutils_toolchains")
+
+register_coreutils_toolchains()

examples/resolve_json_module/BUILD.bazel

@@ -0,0 +1,41 @@
+load("@aspect_rules_js//js:defs.bzl", "js_test")
+load("@aspect_rules_swc//swc:defs.bzl", "swc")
+
+swc(
+    name = "ts",
+    srcs = [
+        "data.json",
+        "index.ts",
+    ],
+    args = [
+        "--config-json",
+        """{"module": {"type": "commonjs"}}""",
+    ],
+)
+
+swc(
+    name = "ts-out_dir",
+    srcs = [
+        "data.json",
+        "index.ts",
+    ],
+    args = [
+        "--config-json",
+        """{"module": {"type": "commonjs"}}""",
+    ],
+    out_dir = "ts-out_dir",
+)
+
+js_test(
+    # Test that the json is available at runtime.
+    name = "ts-with-json",
+    data = [":ts"],
+    entry_point = "index.js",
+)
+
+js_test(
+    # Test that the json is available at runtime with an out_dir.
+    name = "ts-with-json-out_dir",
+    data = [":ts-out_dir"],
+    entry_point = "ts-out_dir/index.js",
+)

examples/resolve_json_module/data.json

@@ -0,0 +1,5 @@
+[
+  {
+    "a": "b"
+  }
+]

examples/resolve_json_module/index.ts

@@ -0,0 +1,2 @@
+import data from "./data.json";
+export const a: string = "hello" + JSON.stringify(data);

swc/BUILD.bazel

@@ -52,6 +52,7 @@ bzl_library(
     deps = [
         "//swc/private:swc",
         "//swc/private:swc_plugin",
+        "@aspect_bazel_lib//lib:copy_file",
         "@bazel_skylib//lib:types",
         "@bazel_skylib//rules:write_file",
     ] + (["@bazel_tools//tools/build_defs/repo:cache.bzl"] if bazel_lib_utils.is_bazel_7_or_greater() else []),

swc/private/swc.bzl

@@ -1,5 +1,7 @@
 "Internal implementation details"
 
+load("@aspect_bazel_lib//lib:copy_file.bzl", "copy_file_action")
+load("@aspect_bazel_lib//lib:copy_to_bin.bzl", "COPY_FILE_TO_BIN_TOOLCHAINS")
 load("@aspect_bazel_lib//lib:platform_utils.bzl", "platform_utils")
 load("@aspect_rules_js//js:libs.bzl", "js_lib_helpers")
 load("@aspect_rules_js//js:providers.bzl", "js_info")
@@ -109,6 +111,9 @@ def _is_js_src(src):
 def _is_supported_src(src):
     return _is_ts_src(src) or _is_js_src(src)
 
+def _is_data_src(src):
+    return src.endswith(".json")
+
 # TODO: vendored from rules_ts - aspect_bazel_lib should provide this?
 # https://github.com/aspect-build/rules_ts/blob/v3.2.1/ts/private/ts_lib.bzl#L194-L200
 def _relative_to_package(path, ctx):
@@ -359,6 +364,22 @@ def _swc_impl(ctx):
                     output_sources.append(src)
                 continue
 
+            if _is_data_src(src_path):
+                # Copy data to the output directory.
+                # NOTE: assumes json must be resolved at runtime, see ts_project(resolve_json_module)
+                if ctx.attr.out_dir:
+                    out_path = "%s/%s" % (ctx.attr.out_dir if ctx.attr.out_dir else ".", src_path)
+                    out_file = ctx.actions.declare_file(out_path)
+                    copy_file_action(
+                        ctx = ctx,
+                        src = src,
+                        dst = out_file,
+                    )
+                    output_sources.append(out_file)
+                else:
+                    output_sources.append(src)
+                continue
+
             js_out_path = _to_js_out(ctx.attr.default_ext, src_path, ctx.attr.out_dir, ctx.attr.root_dir, js_outs_relative)
             if not js_out_path:
                 # This source file is not a supported src
@@ -440,7 +461,7 @@ def _swc_impl(ctx):
 swc = struct(
     implementation = _swc_impl,
     attrs = dict(_attrs, **_outputs),
-    toolchains = ["@aspect_rules_swc//swc:toolchain_type"],
+    toolchains = ["@aspect_rules_swc//swc:toolchain_type"] + COPY_FILE_TO_BIN_TOOLCHAINS,
     calculate_js_outs = _calculate_js_outs,
     calculate_map_outs = _calculate_map_outs,
     calculate_dts_outs = _calculate_dts_outs,