chore: cleanup some deprecated APIs

BREAKING CHANGE:
@bazel/typescript and @bazel/karma no longer have a defs.bzl file. Use
index.bzl instead.

The @Yarn workspace is no longer created. Use @nodejs//:yarn instead.

Fixes bazel-contrib#1144

internal/node/node_labels.bzl

@@ -46,10 +46,3 @@ def get_yarn_label(rctx):
     else:
         label = Label("@nodejs_%s//:bin/yarn" % os_name(rctx))
     return label
-
-def get_yarn_node_repositories_label(rctx):
-    if is_windows_os(rctx):
-        label = Label("@nodejs%s//:bin/yarn_node_repositories.cmd" % os_name(rctx))
-    else:
-        label = Label("@nodejs_%s//:bin/yarn_node_repositories" % os_name(rctx))
-    return label

internal/node/node_repositories.bzl

@@ -24,7 +24,6 @@ load("//internal/common:os_name.bzl", "OS_ARCH_NAMES", "is_windows_os", "os_name
 load("//internal/npm_install:npm_install.bzl", "yarn_install")
 load("//third_party/github.com/bazelbuild/bazel-skylib:lib/paths.bzl", "paths")
 load("//toolchains/node:node_toolchain_configure.bzl", "node_toolchain_configure")
-load(":node_labels.bzl", "get_yarn_node_repositories_label")
 
 _DOC = """To be run in user's WORKSPACE to install rules_nodejs dependencies.
 
@@ -49,10 +48,6 @@ This rule exposes the `@nodejs` workspace containing some rules the user can cal
 - Install dependencies using npm: `bazel run @nodejs//:npm install`
 - Install dependencies using yarn: `bazel run @nodejs//:yarn`
 
-This rule also exposes the `@yarn` workspace for backwards compatibility:
-
-- Alternately install dependencies using yarn: `bazel run @yarn//:yarn`
-
 Note that the dependency installation scripts will run in each subpackage indicated by the `package_json` attribute.
 
 This approach uses npm/yarn as the package manager. You could instead have Bazel act as the package manager, running the install behind the scenes.
@@ -609,18 +604,6 @@ node_repositories_rule = repository_rule(
     attrs = _ATTRS,
 )
 
-def _yarn_repo_impl(repository_ctx):
-    # Base build file for this repository - exposes yarn
-    repository_ctx.file("BUILD.bazel", content = """# Generated by node_repositories.bzl
-package(default_visibility = ["//visibility:public"])
-alias(name = "yarn", actual = "{yarn}")
-""".format(yarn = get_yarn_node_repositories_label(repository_ctx)))
-
-_yarn_repo = repository_rule(
-    _yarn_repo_impl,
-    attrs = {"package_json": attr.label_list()},
-)
-
 def _nodejs_host_os_alias_impl(repository_ctx):
     host_os = os_name(repository_ctx)
     node_repository = "@nodejs_%s" % host_os
@@ -688,12 +671,6 @@ def node_repositories(package_json = [], **kwargs):
         name = "nodejs",
     )
 
-    _maybe(
-        _yarn_repo,
-        name = "yarn",
-        package_json = package_json,
-    )
-
     _maybe(
         yarn_install,
         name = "build_bazel_rules_nodejs_rollup_deps",

packages/typescript/src/package.bzl

@@ -17,14 +17,6 @@
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
-def rules_typescript_dependencies():
-    print("""DEPRECATION WARNING:
-    rules_typescript_dependencies is no longer needed, and will be removed in a future release.
-    We assume you will fetch rules_nodejs in your WORKSPACE file, and no other dependencies remain here.
-    Simply remove any calls to this function and the corresponding call to
-      load("@npm_bazel_typescript//:package.bzl", "rules_typescript_dependencies")
-    """)
-
 def rules_typescript_dev_dependencies():
     """
     Fetch dependencies needed for local development.