From dac014a1468e874830fa56e0190ffe4648d5f898 Mon Sep 17 00:00:00 2001
From: Alex Eagle <alexeagle@google.com>
Date: Thu, 11 Jul 2019 15:39:16 -0700
Subject: [PATCH] feat(stylus): output sourcemap

---
 packages/stylus/src/index.bzl | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/packages/stylus/src/index.bzl b/packages/stylus/src/index.bzl
index 4f96bef071..d1a3846e65 100644
--- a/packages/stylus/src/index.bzl
+++ b/packages/stylus/src/index.bzl
@@ -6,19 +6,22 @@ def _stylus_binary(ctx):
     src = ctx.file.src
 
     # We want foo.styl to produce foo.css
-    output = ctx.actions.declare_file(src.basename[:-5] + ".css")
+    output_name = src.basename[:-5] + ".css"
+    css_output = ctx.actions.declare_file(output_name)
+    map_output = ctx.actions.declare_file(output_name + ".map")
     ctx.actions.run(
-        outputs = [output],
+        outputs = [css_output, map_output],
         inputs = [src] + ctx.files.deps,
         executable = ctx.executable._compiler,
         arguments = [
+            "--sourcemap",
             "--out",
             ctx.bin_dir.path + "/" + ctx.label.package,
             src.path,
         ],
     )
     return [
-        DefaultInfo(files = depset([output])),
+        DefaultInfo(files = depset([css_output, map_output])),
     ]
 
 stylus_binary = rule(