bzlmod: allow custom node_repositories definitions

Author: pjjw

nodejs/extensions.bzl

@@ -1,5 +1,6 @@
 "extensions for bzlmod"
 
+load("//nodejs/private:node_versions.bzl", "NODE_VERSIONS")
 load(
     ":repositories.bzl",
     "DEFAULT_NODE_REPOSITORY",
@@ -47,6 +48,7 @@ def _toolchain_extension(module_ctx):
         nodejs_register_toolchains(
             name = k,
             node_version = v.node_version,
+            node_repositories = v.node_versions,
             node_version_from_nvmrc = v.node_version_from_nvmrc,
             node_urls = v.node_urls,
             include_headers = v.include_headers,
@@ -62,6 +64,10 @@ _ATTRS = {
         doc = "Version of the Node.js interpreter",
         default = DEFAULT_NODE_VERSION,
     ),
+    "node_versions": attr.string_list_dict(
+        doc = "Overrides to the default list of Node.js versions to download.",
+        default = NODE_VERSIONS,
+    ),
     "node_version_from_nvmrc": attr.label(
         allow_single_file = True,
         doc = """The .nvmrc file containing the version of Node.js to use.