Including runfiles in a filegroup - node.js

Question

Im new to Bazel.
I thought id start by trying to build a simple nodejs project, it uses babel to do some transforming as part of the build process, the issue im having is I cant seem to find a way to get these transformed files into a filegroup.
Here's my BUILD file.
load("#build_bazel_rules_nodejs//:defs.bzl", "nodejs_binary")
load("#bazel_tools//tools/build_defs/pkg:pkg.bzl", "pkg_tar")
# Group all our initial code.
filegroup(
name = "src",
srcs = [
".babelrc",
"package.json",
"//config:src",
"//handlers:src",
"//migrations:src",
"//models:src",
"//services:src",
"//tasks:src",
"#dependencies//:node_modules",
],
)
# Group all our generated code.
filegroup(
name = "out",
srcs = [
"//:babel:runfiles" ### ???
],
)
nodejs_binary(
name = "babel",
entry_point = "babel-cli/bin/babel.js",
templated_args = [
".",
"--ignore node_modules,test/,migrations/,babel_bin_loader.js",
"-d out",
"--source-maps=both",
"--copy-files",
],
node_modules = "#nodejs_build_tools//:node_modules",
data = [
"//:src",
]
)
pkg_tar(
name = "build",
strip_prefix = "/",
package_dir = "/usr/src/app",
srcs = ["//:out"],
mode = "0755",
)
My issue is that im not sure how to reference the runfiles from my nodejs_binary rule.
https://github.com/bazelbuild/rules_nodejs/blob/master/internal/node/node.bzl#L130
Seems to indicate that there should be a :runfiles attribute or similar?
Thanks! :)

Answer 1

So turns out that the correct way to do this appears to be by using a genrule to actually call the configured nodejs binary. Eg.
## Artifact Construction ##
genrule(
name = "construct_artifact",
outs = ["artifact.tar"],
cmd = """./$(location babel) . --ignore bazel-
out,node_modules,text/,migrations/ -d out/ --source-maps=both --copy-files && tar cvf $# out/ """,
srcs = [
"//:src",
],
tools = [
"//:babel",
]
)