Adds npm_publish() macro.

Refs #48.

This generates a binary which publishes the given package to NPM. It just merges the given directory with the root `.npmrc` file (which contains authentication information) and calls `npm publish`.

Also made publish binaries for `rules_prerender` and `@rules_prerender/declarative_shadow_dom`.

I tried to add a trap which deletes the staging directory after the binary has run, but I got permission errors and couldn't easily figure out what was going on. Fortunately `mktemp` still creates files under `$TMP`, so they should be cleaned up automatically, just a little less agressively than they could be.

BUILD.bazel

@@ -6,9 +6,12 @@ load("@bazel_skylib//rules:build_test.bzl", "build_test")
 load("@build_bazel_rules_nodejs//:index.bzl", "pkg_npm")
 load("@npm_rules_js//:defs.bzl", "npm_link_all_packages")
 load("//tools:publish.bzl", "publish_files")
+load("//tools/publish:npm_publish.bzl", "npm_publish")
 load("//tools/stamping:stamp_package.bzl", "stamp_package")
 load("//:index.bzl", "link_prerender_component", "prerender_component", "prerender_component_publish_files")
 
+exports_files([".npmrc"], visibility = ["//visibility:public"])
+
 ts_config(
     name = "tsconfig",
     src = "tsconfig.json",
@@ -41,6 +44,11 @@ npm_package(
     # See: https://github.com/dgp1130/rules_prerender/issues/48#issuecomment-1425257276
     include_external_repositories = ["rules_prerender"],
 )
+npm_publish(
+    name = "rules_prerender_pkg_publish",
+    package = ":rules_prerender_pkg",
+    npmrc = ".npmrc",
+)
 npm_link_package(
     name = "node_modules/rules_prerender",
     src = ":rules_prerender_pkg",

packages/rules_prerender/declarative_shadow_dom/BUILD.bazel

@@ -10,6 +10,7 @@ load(
 load("//tools:jasmine.bzl", "jasmine_node_test")
 load("//tools:publish.bzl", "publish_files")
 load("//tools:typescript.bzl", "ts_project")
+load("//tools/publish:npm_publish.bzl", "npm_publish")
 load("//tools/stamping:stamp_package.bzl", "stamp_package")
 
 publish_files(
@@ -37,6 +38,11 @@ npm_package(
     # See: https://github.com/dgp1130/rules_prerender/issues/48#issuecomment-1425257276
     include_external_repositories = ["rules_prerender"],
 )
+npm_publish(
+    name = "pkg_publish",
+    package = ":pkg",
+    npmrc = "//:.npmrc",
+)
 
 prerender_component(
     name = "declarative_shadow_dom",

tools/publish/BUILD.bazel

@@ -0,0 +1,8 @@
+load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
+
+exports_files(["npm_publish.sh"], visibility = ["//visibility:public"])
+
+bzl_library(
+    name = "npm_publish",
+    srcs = ["npm_publish.bzl"],
+)

tools/publish/npm_publish.bzl

@@ -0,0 +1,59 @@
+load("@aspect_bazel_lib//lib:copy_to_bin.bzl", "copy_to_bin")
+load("@aspect_rules_js//npm:providers.bzl", "NpmPackageInfo")
+load("@bazel_skylib//rules:build_test.bzl", "build_test")
+load("//common:label.bzl", "absolute", "file_path_of")
+
+def npm_publish(name, package, npmrc, testonly = None, visibility = None):
+    """Publishes the given `npm_package()` to NPM.
+
+    Generates a binary which, when run, publishes the given package to NPM.
+    Authentication information should be provided via `_authToken` in the
+    provided `.npmrc` file. Also generates a test to make sure the binary builds
+    successfully, since this it is very likely nothing else will depend on this.
+
+    Args:
+        name: Name of this target.
+        package: The `npm_package()` to publish.
+        npmrc: The `.npmrc` file containing authentication information.
+        testonly: https://bazel.build/reference/be/common-definitions#common-attributes
+        visibility: https://bazel.build/reference/be/common-definitions#common-attributes
+    """
+    # For some reason we need to `copy_to_bin()` for the directory to show up in
+    # `sh_binary()` runfiles? TBH, I don't understand why this is necessary.
+    package_bin = "%s_package" % name
+    copy_to_bin(
+        name = package_bin,
+        srcs = [package],
+        testonly = testonly,
+    )
+
+    # Merge the `.npmrc` and package together, then run `npm publish`.
+    # Authentication information should be in the `.npmrc`.
+    native.sh_binary(
+        name = name,
+        srcs = [Label("//tools/publish:npm_publish.sh")],
+        data = [package_bin, npmrc, "@pnpm//:pnpm"],
+        args = [
+            "rules_prerender/%s" % _normalize(file_path_of(absolute(package))),
+            "rules_prerender/%s" % _normalize(file_path_of(absolute(npmrc))),
+            "pnpm/pnpm.sh",
+        ],
+        deps = ["@bazel_tools//tools/bash/runfiles"],
+        testonly = testonly,
+        visibility = visibility,
+    )
+
+    # Always generate a test so the release process doesn't attempt to run
+    # multiple publish binaries only to find that the second one fails to build.
+    build_test(
+        name = "%s_test" % name,
+        targets = [":%s" % name],
+    )
+
+# Bash runfiles is very particular about file paths, extra `./` paths are not
+# allowed.
+def _normalize(path):
+    normalized = path.replace("/./", "/")
+    if normalized.startswith("./"):
+        return normalized[2:]
+    return normalized

tools/publish/npm_publish.sh

@@ -0,0 +1,30 @@
+# --- begin runfiles.bash initialization v2 ---
+# Copy-pasted from the Bazel Bash runfiles library v2.
+set -uo pipefail; set +e; f=bazel_tools/tools/bash/runfiles/runfiles.bash
+source "${RUNFILES_DIR:-/dev/null}/$f" 2>/dev/null || \
+    source "$(grep -sm1 "^$f " "${RUNFILES_MANIFEST_FILE:-/dev/null}" | cut -f2- -d' ')" 2>/dev/null || \
+    source "$0.runfiles/$f" 2>/dev/null || \
+    source "$(grep -sm1 "^$f " "$0.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
+    source "$(grep -sm1 "^$f " "$0.exe.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
+    { echo>&2 "ERROR: cannot find $f"; exit 1; }; f=; set -e
+# --- end runfiles.bash initialization v2 ---
+
+# Resolve arguments.
+readonly PACKAGE="$(rlocation ${1})"
+readonly NPMRC="$(rlocation ${2})"
+readonly NPM="$(rlocation ${3})"
+
+# Make sure there isn't already an `.npmrc` file in the package.
+if [[ -f "${PACKAGE}/.npmrc" ]]; then
+    echo ".npmrc already exists in `${PACKAGE}`, expected it not to." >&2
+    exit 1
+fi
+
+# Merge the package and the `.npmrc` in the temporary staging directory.
+readonly STAGING_DIRECTORY=$(mktemp -d)
+cp -r ${PACKAGE}/* "${STAGING_DIRECTORY}"
+cp "${NPMRC}" "${STAGING_DIRECTORY}/.npmrc"
+
+# Publish to NPM. Use `--no-git-checks` to ignore the `.git/` state, which is
+# still discovered by NPM, even within a Bazel context.
+"${NPM}" publish "${STAGING_DIRECTORY}" --no-git-checks --access public