feat(rollup): add args attribute to rollup_bundle rule

packages/rollup/src/rollup_bundle.bzl

@@ -65,6 +65,16 @@ You must not repeat file(s) passed to entry_point/entry_points.
         # Don't try to constrain the filenames, could be json, svg, whatever
         allow_files = True,
     ),
+    "args": attr.string_list(
+        doc = """Command line arguments to pass to rollup. Can be used to override config file settings.
+
+These argument passed on the command line before all arguments that are always added by the
+rule such as `--output.dir` or `--output.file`, `--format`, `--config` and `--preserveSymlinks` and
+also those that are optionally added by the rule such as `--sourcemap`.
+
+See rollup CLI docs https://rollupjs.org/guide/en/#command-line-flags for complete list of supported arguments.""",
+        default = [],
+    ),
     "config_file": attr.label(
         doc = """A rollup.config.js file
 
@@ -286,6 +296,9 @@ def _rollup_bundle(ctx):
     # See CLI documentation at https://rollupjs.org/guide/en/#command-line-reference
     args = ctx.actions.args()
 
+    # Add user specified arguments *before* rule supplied arguments
+    args.add_all(ctx.attr.args)
+
     # List entry point argument first to save some argv space
     # Rollup doc says
     # When provided as the first options, it is equivalent to not prefix them with --input

packages/rollup/test/sourcemaps/BUILD.bazel

@@ -4,6 +4,11 @@ load("@npm_bazel_rollup//:index.from_src.bzl", "rollup_bundle")
 rollup_bundle(
     name = "bundle",
     srcs = ["s.js"],
+    # Test existance of args attribute
+    args = [
+        "--environment",
+        "FOO,BAR:baz",
+    ],
     # Use the desugared form to assert that it works
     entry_points = {"input.js": "bundle"},
     sourcemap = "true",