Document that --config is broken

examples/custom_outs/BUILD.bazel

@@ -1,17 +1,43 @@
+"""Demonstrate that js_outs can go to whatever file extensions you like."""
+
 load("@aspect_bazel_lib//lib:write_source_files.bzl", "write_source_files")
 load("@aspect_rules_swc//swc:defs.bzl", "swc_compile")
+load("@bazel_skylib//rules:write_file.bzl", "write_file")
+
+# Note, --config is documented on swcx CLI but isn't functional. See
+# https://github.com/swc-project/swc/issues/4017#issuecomment-1374141572
+# In the call to swc_compile below, we ought to be able to use
+#   `args = ["--config", "module.format=" + format]`
+# As a workaround, write our config to an rc file. Can be changed back when swcx supports --config.
+[
+    write_file(
+        name = "_write_swcrc_" + format,
+        out = "swcrc_" + format,
+        content = [json.encode({
+            "jsc": {
+                "parser": {
+                    "syntax": "typescript",
+                },
+            },
+            "module": {
+                "type": format,
+            },
+        })],
+    )
+    for format in [
+        "commonjs",
+        "es6",
+    ]
+]
 
 [
     swc_compile(
         name = "transpile_" + format,
         srcs = ["a.ts"],
-        args = [
-            "--config",
-            "module.type=" + format,
-        ],
         # The extension of the outputs can be modified using js_outs
         js_outs = [format + "/a." + ("cjs" if format == "commonjs" else "js")],
         out_dir = format,
+        swcrc = "swcrc_" + format,
     )
     for format in [
         "commonjs",

examples/custom_outs/expected.cjs

@@ -1 +1,11 @@
-export var a = "a";
+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+Object.defineProperty(exports, "a", {
+    enumerable: true,
+    get: function() {
+        return a;
+    }
+});
+var a = "a";