Make prepack-dev work with js_bundle_genrule

Summary: Make prepack work with `js_bundle_genrule` by creating a nodejs_binary call that wraps the prepack CLI.

Reviewed By: davidaurelio

Differential Revision: D6107598

fbshipit-source-id: 6cf3992ecfdc3e15eeed648d341389f4415b79a6

DEFS

@@ -0,0 +1,13 @@
+def create_prepack_dev_postprocessor(name, js_bundle, modelfile):
+  return js_bundle_genrule(
+    name = name,
+    js_bundle = js_bundle,
+    bash = r"""
+      set -e
+      $(exe //prepack:prepack-bundle-dev) {MODEL} --out "$OUT/$JS_BUNDLE_NAME" \
+        --srcmapIn "$SOURCEMAP" --srcmapOut "$SOURCEMAP_OUT" \
+        $JS_DIR/$JS_BUNDLE_NAME
+    """.format(MODEL = modelfile),
+    rewrite_sourcemap = True,
+    visibility = ["PUBLIC"],
+  )