build: re-root style files for bazel cdk package

The CDK contains stylesheet files which are re-rooted at the NPM
package root. This needs to be done for the bazel package as
well as it would otherwise break a lot of consumers.

Author: devversion

packages.bzl

@@ -16,10 +16,17 @@ CDK_PACKAGES = [
     "scrolling",
     "stepper",
     "table",
+    "testing",
     "text-field",
     "tree",
 ]
 
+CDK_TARGETS_WITH_STYLES = [
+    "a11y",
+    "overlay",
+    "text-field",
+]
+
 CDK_TARGETS = ["//src/cdk"] + ["//src/cdk/%s" % p for p in CDK_PACKAGES]
 
 CDK_EXPERIMENTAL_PACKAGES = [

src/cdk/BUILD.bazel

@@ -1,6 +1,6 @@
 package(default_visibility = ["//visibility:public"])
 
-load("//:packages.bzl", "CDK_PACKAGES", "CDK_TARGETS", "ROLLUP_GLOBALS")
+load("//:packages.bzl", "CDK_PACKAGES", "CDK_TARGETS", "CDK_TARGETS_WITH_STYLES", "ROLLUP_GLOBALS")
 load("//tools:defaults.bzl", "ng_module", "ng_package")
 
 # Root "@angular/cdk" entry-point that does not re-export individual entry-points.
@@ -16,6 +16,35 @@ ng_module(
     ],
 )
 
+# List of style files that need to be copied to the root of the CDK package. This is
+# necessary in order to keep the Bazel NPM package similar to the previous gulp output.
+rerootedStyles = [file for target in CDK_TARGETS_WITH_STYLES for file in [
+    [
+        "_%s.scss" % target,
+        target,
+    ],
+    [
+        "%s-prebuilt.css" % target,
+        target,
+    ],
+    [
+        "%s-prebuilt.css.map" % target,
+        target,
+    ],
+]]
+
+# Copy all stylesheets to the CDK root package. We need to copy these files, as
+# these stylesheets need to be at the root of the NPM package (e.g. "_a11y.scss")
+[genrule(
+    name = "%s_rerooted" % file,
+    srcs = ["//src/cdk/%s:%s" % (target, file)],
+    outs = [file],
+    cmd = "cp $< $@",
+) for [
+    file,
+    target,
+] in rerootedStyles]
+
 filegroup(
     name = "overviews",
     srcs = ["//src/cdk/%s:overview" % name for name in CDK_PACKAGES],
@@ -25,11 +54,12 @@ filegroup(
 ng_package(
     name = "npm_package",
     srcs = ["package.json"],
+    data = ["%s_rerooted" % file for [
+        file,
+        _,
+    ] in rerootedStyles],
     entry_point = ":public-api.ts",
     globals = ROLLUP_GLOBALS,
-    # TODO(devversion): Use the npm package for publishing. Right now this is disabled because
-    # we build using AOT for serving & testing, but the `ng_package` rule should not include factory
-    # files.
-    tags = ["manual"],
+    tags = ["release-package"],
     deps = CDK_TARGETS,
 )