add a rule to get a binary, and get browserify

BUCK

@@ -1,6 +1,6 @@
 # A list of available rules and their signatures can be found here: https://buck2.build/docs/api/rules/
 load("@prelude-nri//:elm.bzl", "elm_docs")
-load("@prelude-nri//:node.bzl", "node_modules")
+load("@prelude-nri//:node.bzl", "node_modules", "npm_bin")
 
 elm_docs(
     name = "docs.json",
@@ -19,3 +19,8 @@ node_modules(
     package = "package.json",
     package_lock = "package-lock.json",
 )
+
+npm_bin(
+    name = "browserify",
+    node_modules = ":node_modules",
+)

prelude-nri/node.bzl

@@ -35,3 +35,43 @@ node_modules = rule(
         ),
     }
 )
+
+def _npm_bin_impl(ctx: "context") -> [[DefaultInfo.type, RunInfo.type]]:
+    bin_name = ctx.attrs.bin_name or ctx.attrs.name
+
+    out = ctx.actions.declare_output(bin_name)
+
+    node_toolchain = ctx.attrs._node_toolchain[NodeToolchainInfo]
+
+    ctx.actions.run(
+        [
+            ctx.attrs._python_toolchain[PythonToolchainInfo].interpreter,
+            node_toolchain.build_npm_bin[DefaultInfo].default_outputs,
+            ctx.attrs.node_modules,
+            bin_name,
+            out.as_output(),
+            "--bin-dir", node_toolchain.bin_dir[DefaultInfo].default_outputs,
+        ],
+        category = "build_npm_bin",
+    )
+
+    return [
+        DefaultInfo(default_output = out),
+        RunInfo(out),
+    ]
+
+npm_bin = rule(
+    impl = _npm_bin_impl,
+    attrs = {
+        "bin_name": attrs.option(attrs.string(), default=None),
+        "node_modules": attrs.source(),
+        "_node_toolchain": attrs.toolchain_dep(
+            default="toolchains//:node",
+            providers=[NodeToolchainInfo]
+        ),
+        "_python_toolchain": attrs.toolchain_dep(
+            default="toolchains//:python",
+            providers=[PythonToolchainInfo]
+        ),
+    }
+)