refactor: move bundler configs into tool runfiles for exec/target platform separation

For webpack and rollup invocations, configs and their npm plugin/loader
dependencies now live in the tool binary's runfiles rather than being
passed as target-platform action inputs. This ensures all exec-platform
code runs from the same runfiles tree, avoiding resolution failures in
cross-platform builds.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: acozzette

examples/webpack_cli/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@aspect_rules_js//js:defs.bzl", "js_library", "js_test")
+load("@aspect_rules_js//js:defs.bzl", "js_library", "js_run_binary", "js_test")
 load("@npm//:defs.bzl", "npm_link_all_packages")
 load("@npm//webpack_cli:webpack-cli/package_json.bzl", "bin")
 
@@ -13,27 +13,37 @@ js_library(
     ],
     deps = [
         ":node_modules/@vanilla-extract/css",
+        ":node_modules/mathjs",
+    ],
+)
+
+js_library(
+    name = "webpack-config",
+    srcs = ["webpack.config.js"],
+    deps = [
         ":node_modules/@vanilla-extract/webpack-plugin",
         ":node_modules/css-loader",
-        ":node_modules/mathjs",
         ":node_modules/mini-css-extract-plugin",
     ],
 )
 
-bin.webpack_cli(
-    name = "bundle",
-    srcs = [
-        ":lib",
-        ":webpack.config.js",
-    ],
-    outs = [
-        "dist/main.js",
-    ],
-    args = [
-        "--config webpack.config.js",
+bin.webpack_cli_binary(
+    name = "webpack_cli_binary",
+    data = [":webpack-config"],
+    fixed_args = [
+        "--config",
+        "$$RUNFILES_DIR/$(rlocationpath :webpack-config)",
     ],
+)
+
+js_run_binary(
+    name = "bundle",
+    srcs = [":lib"],
+    outs = ["dist/main.js"],
     chdir = package_name(),
     log_level = "debug",
+    tool = ":webpack_cli_binary",
+    use_execroot_entry_point = False,
 )
 
 js_test(

js/private/worker/src/BUILD.bazel

@@ -1,36 +1,48 @@
 load("@npm//:defs.bzl", "npm_link_all_packages")
+load("//js:defs.bzl", "js_library", "js_run_binary")
 load("@npm//js/private/worker/src:rollup/package_json.bzl", rollup_bin = "bin")
 
 npm_link_all_packages()
 
-rollup_bin.rollup(
-    name = "bundle",
-    srcs = [
-        "index.ts",
-        "rollup.config.mjs",
-        "size.ts",
-        "worker_protocol.ts",
+js_library(
+    name = "config",
+    srcs = ["rollup.config.mjs"],
+    deps = [
         ":node_modules/@rollup/plugin-commonjs",
         ":node_modules/@rollup/plugin-json",
         ":node_modules/@rollup/plugin-node-resolve",
         ":node_modules/@rollup/plugin-typescript",
         ":node_modules/@types/google-protobuf",
         ":node_modules/@types/node",
-        ":node_modules/google-protobuf",
         ":node_modules/tslib",
     ],
-    outs = [
-        "bundle.js",
-    ],
-    args = [
+)
+
+rollup_bin.rollup_binary(
+    name = "rollup_binary",
+    data = [":config"],
+    fixed_args = [
         "index.ts",
         "--config",
-        "rollup.config.mjs",
+        "$$RUNFILES_DIR/$(rlocationpath :config)",
         "--format",
         "cjs",
         "--file",
         "bundle.js",
     ],
+)
+
+js_run_binary(
+    name = "bundle",
+    srcs = [
+        "index.ts",
+        "size.ts",
+        "worker_protocol.ts",
+        ":node_modules/google-protobuf",
+    ],
+    outs = ["bundle.js"],
     chdir = package_name(),
+    tool = ":rollup_binary",
+    use_execroot_entry_point = False,
     visibility = ["//js/private/worker:__pkg__"],
 )

npm/private/lifecycle/src/BUILD.bazel

@@ -1,3 +1,4 @@
+load("//js:defs.bzl", "js_run_binary")
 load("@npm//npm/private/lifecycle:rollup/package_json.bzl", rollup_bin = "bin")
 
 # Bundle our program with its dependencies, because they're large:
@@ -12,25 +13,31 @@ load("@npm//npm/private/lifecycle:rollup/package_json.bzl", rollup_bin = "bin")
 # └─────────────────┴──────────────┴────────┘
 # This avoids users having to fetch all those packages just to run the postinstall hooks.
 
-rollup_bin.rollup(
+rollup_bin.rollup_binary(
+    name = "rollup_binary",
+    data = ["//npm/private/lifecycle:rollup_config"],
+    fixed_args = [
+        "lifecycle-hooks.js",
+        "--config",
+        "$$RUNFILES_DIR/$(rlocationpath //npm/private/lifecycle:rollup_config)",
+        "--format",
+        "cjs",
+        "--file",
+        "index.min.js",
+    ],
+)
+
+js_run_binary(
     name = "bundle",
     srcs = [
         "lifecycle-hooks.js",
         "//npm/private/lifecycle:node_modules/@pnpm/lifecycle",
         "//npm/private/lifecycle:node_modules/@pnpm/logger",
         "//npm/private/lifecycle:node_modules/@pnpm/read-package-json",
-        "//npm/private/lifecycle:rollup_config",
     ],
     outs = ["index.min.js"],
-    args = [
-        "lifecycle-hooks.js",
-        "--config",
-        "../rollup.config.mjs",
-        "--format",
-        "cjs",
-        "--file",
-        "index.min.js",
-    ],
     chdir = package_name(),
+    tool = ":rollup_binary",
+    use_execroot_entry_point = False,
     visibility = ["//npm/private/lifecycle:__subpackages__"],
 )