diff --git a/.bazelversion b/.bazelversion
new file mode 100644
index 0000000..19b860c
--- /dev/null
+++ b/.bazelversion
@@ -0,0 +1 @@
+6.4.0
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5eb0b2f..aaf8b73 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,10 +19,13 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
-      - name: Install bazel
-        run: tools/install_deps.sh
+      - name: Mount bazel cache
+        uses: actions/cache@v3
+        with:
+          path: "~/.cache/bazel"
+          key: bazel
 
       - name: Run tests
         run: tools/run_tests.sh
diff --git a/README.md b/README.md
index 3cf460c..665332b 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,12 @@ with [Bazel](https://bazel.build).
 Setup
 -----
 
+Make sure Bazel is installed on your system. See the [Bazel
+documentation](https://docs.bazel.build/versions/master/install.html) for
+platform-specific instructions. We recommend using [Bazelisk](
+https://bazel.build/install/bazelisk.html) to ensure you are using a supported
+version.
+
 To use the Dart rules, add the following to your `WORKSPACE` file to add the
 external repositories for the Dart toolchain:
 
@@ -70,3 +76,9 @@ load("@io_bazel_rules_dart//dart/build_rules:web.bzl", RULE_NAME)
 `dart_web_application`: Compiles the specified script to JavaScript.
 
 `dart_web_test`: Builds a test that will be executed in the browser.
+
+
+Protocol Buffer rules
+---------------------
+
+`dart_proto_library`: Generates Dart implementations of `.proto` dependencies.
diff --git a/WORKSPACE b/WORKSPACE
index 9554e52..1e073ea 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -2,3 +2,9 @@ workspace(name = "io_bazel_rules_dart")
 
 load("//dart/build_rules:repositories.bzl", "dart_repositories")
 dart_repositories()
+
+load("//dart/build_rules:repositories.bzl", "proto_repositories")
+proto_repositories()
+
+load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
+protobuf_deps()
diff --git a/dart/build_rules/internal.bzl b/dart/build_rules/internal.bzl
index 0f581c3..e3eb62d 100644
--- a/dart/build_rules/internal.bzl
+++ b/dart/build_rules/internal.bzl
@@ -21,238 +21,235 @@ a mechanism for enforcing limitied visibility of Skylark rules. This code makes
 no gurantees of API stability and is intended solely for use by the Dart rules.
 """
 
-
 _third_party_prefix = "third_party/dart/"
 
-
 def assert_third_party_licenses(ctx):
-  """Asserts license attr on non-testonly third-party packages."""
-  if (not ctx.attr.testonly
-      and not ctx.attr.license_files
-      and ctx.label.package.startswith(_third_party_prefix)):
-    fail("%s lacks license_files attribute, " % ctx.label +
-         "required for all non-testonly third-party Dart library rules")
-
+    """Asserts license attr on non-testonly third-party packages."""
+    if (not ctx.attr.testonly and
+        not ctx.attr.license_files and
+        ctx.label.package.startswith(_third_party_prefix)):
+        fail("%s lacks license_files attribute, " % ctx.label +
+             "required for all non-testonly third-party Dart library rules")
 
 def collect_files(dart_ctx):
-  srcs = dart_ctx.srcs
-  data = dart_ctx.data
-  for d in dart_ctx.transitive_deps.values():
-    srcs = srcs + d.dart.srcs
-    data = srcs + d.dart.data
-  return (srcs, data)
-
+    srcs = dart_ctx.srcs
+    data = dart_ctx.data
+    for d in dart_ctx.transitive_deps.values():
+        srcs = srcs + d.dart.srcs
+        data = srcs + d.dart.data
+    return (srcs, data)
 
 def _collect_transitive_deps(deps):
-  """Collects transitive closure of deps.
-
-  Args:
-    deps: input deps Target collection. All targets must have a 'dart' provider.
+    """Collects transitive closure of deps.
 
-  Returns:
-    Transitive closure of deps.
-  """
-  transitive_deps = {}
-  for dep in deps:
-    transitive_deps.update(dep.dart.transitive_deps)
-    transitive_deps["%s" % dep.dart.label] = dep
-  return transitive_deps
+    Args:
+      deps: input deps Target collection. All targets must have a 'dart' provider.
 
+    Returns:
+      Transitive closure of deps.
+    """
+    transitive_deps = {}
+    for dep in deps:
+        transitive_deps.update(dep.dart.transitive_deps)
+        transitive_deps["%s" % dep.dart.label] = dep
+    return transitive_deps
 
 def _label_to_dart_package_name(label):
-  """Returns the Dart package name for the specified label.
-
-  Packages under //third_party/dart resolve to their external Pub package names.
-  All other packages resolve to a unique identifier based on their repo path.
-
-  Examples:
-    //foo/bar/baz:           foo.bar.baz
-    //third_party/dart/args: args
-    //third_party/guice:     third_party.guice
-
-  Restrictions:
-    Since packages outside of //third_party/dart are identified by their path
-    components joined by periods, it is an error for the label package to
-    contain periods.
-
-  Args:
-    label: the label whose package name is to be returned.
-
-  Returns:
-    The Dart package name associated with the label.
-  """
-  package_name = label.package
-  if label.package.startswith(_third_party_prefix):
-    third_party_path = label.package[len(_third_party_prefix):]
-    if "/" not in third_party_path:
-      package_name = third_party_path
-  if "." in package_name:
-    fail("Dart package paths may not contain '.': " + label.package)
-  return package_name.replace("/", ".")
-
-
-def _new_dart_context(label,
-                      package,
-                      lib_root,
-                      srcs=None,
-                      data=None,
-                      deps=None,
-                      transitive_deps=None):
-  return struct(
-      label=label,
-      package=package,
-      lib_root=lib_root,
-      srcs=srcs or [],
-      data=data or [],
-      deps=deps or [],
-      transitive_deps=dict(transitive_deps or {}),
-  )
-
-
-def make_dart_context(label,
-                      package=None,
-                      lib_root=None,
-                      srcs=None,
-                      data=None,
-                      deps=None):
-  if not package:
-    package = _label_to_dart_package_name(label)
-  if not lib_root:
-    lib_root = "%s/lib/" % label.package
-  srcs = srcs or []
-  data = data or []
-  deps = deps or []
-  transitive_deps = _collect_transitive_deps(deps)
-  return struct(
-      label=label,
-      package=package,
-      lib_root=lib_root,
-      srcs=srcs,
-      data=data,
-      deps=deps,
-      transitive_deps=transitive_deps,
-  )
-
+    """Returns the Dart package name for the specified label.
+
+    Packages under //third_party/dart resolve to their external Pub package names.
+    All other packages resolve to a unique identifier based on their repo path.
+
+    Examples:
+      //foo/bar/baz:           foo.bar.baz
+      //third_party/dart/args: args
+      //third_party/guice:     third_party.guice
+
+    Restrictions:
+      Since packages outside of //third_party/dart are identified by their path
+      components joined by periods, it is an error for the label package to
+      contain periods.
+
+    Args:
+      label: the label whose package name is to be returned.
+
+    Returns:
+      The Dart package name associated with the label.
+    """
+    package_name = label.package
+    if label.package.startswith(_third_party_prefix):
+        third_party_path = label.package[len(_third_party_prefix):]
+        if "/" not in third_party_path:
+            package_name = third_party_path
+    if "." in package_name:
+        fail("Dart package paths may not contain '.': " + label.package)
+    return package_name.replace("/", ".")
+
+def _new_dart_context(
+        label,
+        package,
+        lib_root,
+        srcs = None,
+        data = None,
+        deps = None,
+        transitive_deps = None):
+    return struct(
+        label = label,
+        package = package,
+        lib_root = lib_root,
+        srcs = srcs or [],
+        data = data or [],
+        deps = deps or [],
+        transitive_deps = dict(transitive_deps or {}),
+    )
+
+def make_dart_context(
+        label,
+        package = None,
+        lib_root = None,
+        srcs = None,
+        data = None,
+        deps = None):
+    if not package:
+        package = _label_to_dart_package_name(label)
+    if not lib_root:
+        lib_root = "%s/lib/" % label.package
+    srcs = srcs or []
+    data = data or []
+    deps = deps or []
+    transitive_deps = _collect_transitive_deps(deps)
+    return struct(
+        label = label,
+        package = package,
+        lib_root = lib_root,
+        srcs = srcs,
+        data = data,
+        deps = deps,
+        transitive_deps = transitive_deps,
+    )
 
 def _merge_dart_context(dart_ctx1, dart_ctx2):
-  """Merges two dart contexts whose package and lib_root must be identical."""
-  if dart_ctx1.package != dart_ctx2.package:
-    fail("Incompatible packages: %s and %s" % (dart_ctx1.package,
-                                               dart_ctx2.package))
-  if dart_ctx1.lib_root != dart_ctx2.lib_root:
-    fail("Incompatible lib_roots for package %s:\n" % dart_ctx1.package +
-         "  %s declares: %s\n" % (dart_ctx1.label, dart_ctx1.lib_root) +
-         "  %s declares: %s\n" % (dart_ctx2.label, dart_ctx2.lib_root) +
-         "Targets in the same package must declare the same lib_root")
-
-  transitive_deps = {}
-  transitive_deps.update(dart_ctx1.transitive_deps)
-  transitive_deps.update(dart_ctx2.transitive_deps)
-  return _new_dart_context(
-      label=dart_ctx1.label,
-      package=dart_ctx1.package,
-      lib_root=dart_ctx1.lib_root,
-      srcs=dart_ctx1.srcs + dart_ctx2.srcs,
-      data=dart_ctx1.data + dart_ctx2.data,
-      deps=dart_ctx1.deps + dart_ctx2.deps,
-      transitive_deps=transitive_deps,
-  )
-
-
-def _collect_dart_context(dart_ctx, transitive=True, include_self=True):
-  """Collects and returns dart contexts."""
-  # Collect direct or transitive deps.
-  dart_ctxs = [dart_ctx]
-  if transitive:
-    dart_ctxs += [d.dart for d in dart_ctx.transitive_deps.values()]
-  else:
-    dart_ctxs += [d.dart for d in dart_ctx.deps]
-
-  # Optionally, exclude all self-packages.
-  if not include_self:
-    dart_ctxs = [c for c in dart_ctxs if c.package != dart_ctx.package]
-
-  # Merge Dart context by package.
-  ctx_map = {}
-  for dc in dart_ctxs:
-    if dc.package in ctx_map:
-      dc = _merge_dart_context(ctx_map[dc.package], dc)
-    ctx_map[dc.package] = dc
-  return ctx_map
-
+    """Merges two dart contexts whose package and lib_root must be identical."""
+    if dart_ctx1.package != dart_ctx2.package:
+        fail("Incompatible packages: %s and %s" % (
+            dart_ctx1.package,
+            dart_ctx2.package,
+        ))
+    if dart_ctx1.lib_root != dart_ctx2.lib_root:
+        fail("Incompatible lib_roots for package %s:\n" % dart_ctx1.package +
+             "  %s declares: %s\n" % (dart_ctx1.label, dart_ctx1.lib_root) +
+             "  %s declares: %s\n" % (dart_ctx2.label, dart_ctx2.lib_root) +
+             "Targets in the same package must declare the same lib_root")
+
+    transitive_deps = {}
+    transitive_deps.update(dart_ctx1.transitive_deps)
+    transitive_deps.update(dart_ctx2.transitive_deps)
+    return _new_dart_context(
+        label = dart_ctx1.label,
+        package = dart_ctx1.package,
+        lib_root = dart_ctx1.lib_root,
+        srcs = dart_ctx1.srcs + dart_ctx2.srcs,
+        data = dart_ctx1.data + dart_ctx2.data,
+        deps = dart_ctx1.deps + dart_ctx2.deps,
+        transitive_deps = transitive_deps,
+    )
+
+def collect_dart_context(dart_ctx, transitive = True, include_self = True):
+    """Collects and returns dart contexts."""
+
+    # Collect direct or transitive deps.
+    dart_ctxs = [dart_ctx]
+    if transitive:
+        dart_ctxs += [d.dart for d in dart_ctx.transitive_deps.values()]
+    else:
+        dart_ctxs += [d.dart for d in dart_ctx.deps]
+
+    # Optionally, exclude all self-packages.
+    if not include_self:
+        dart_ctxs = [c for c in dart_ctxs if c.package != dart_ctx.package]
+
+    # Merge Dart context by package.
+    ctx_map = {}
+    for dc in dart_ctxs:
+        if dc.package in ctx_map:
+            dc = _merge_dart_context(ctx_map[dc.package], dc)
+        ctx_map[dc.package] = dc
+    return ctx_map
 
 def package_spec_action(ctx, dart_ctx, output):
-  """Creates an action that generates a Dart package spec.
-
-  Arguments:
-    ctx: The rule context.
-    dart_ctx: The Dart context.
-    output: The output package_spec file.
-  """
-  # There's a 1-to-many relationship between packages and targets, but
-  # collect_transitive_packages() asserts that their lib_roots are the same.
-  dart_ctxs = _collect_dart_context(dart_ctx,
-                                    transitive=True,
-                                    include_self=True).values()
-
-  # Generate the content.
-  content = "# Generated by Bazel\n"
-  for dc in dart_ctxs:
-    relative_lib_root = _relative_path(dart_ctx.label.package, dc.lib_root)
-    content += "%s:%s\n" % (dc.package, relative_lib_root)
-
-  # Emit the package spec.
-  ctx.actions.write(
-      output=output,
-      content=content,
-  )
-
+    """Creates an action that generates a Dart package spec.
+
+    Arguments:
+      ctx: The rule context.
+      dart_ctx: The Dart context.
+      output: The output package_spec file.
+    """
+
+    # There's a 1-to-many relationship between packages and targets, but
+    # collect_transitive_packages() asserts that their lib_roots are the same.
+    dart_ctxs = collect_dart_context(
+        dart_ctx,
+        transitive = True,
+        include_self = True,
+    ).values()
+
+    # Generate the content.
+    content = "# Generated by Bazel\n"
+    for dc in dart_ctxs:
+        relative_lib_root = _relative_path(dart_ctx.label.package, dc.lib_root)
+        content += "%s:%s\n" % (dc.package, relative_lib_root)
+
+    # Emit the package spec.
+    ctx.actions.write(
+        output = output,
+        content = content,
+    )
 
 def _relative_path(from_dir, to_path):
-  """Returns the relative path from a directory to a path via the repo root."""
-  return "../" * (from_dir.count("/") + 1) + to_path
-
+    """Returns the relative path from a directory to a path via the repo root."""
+    return "../" * (from_dir.count("/") + 1) + to_path
 
 def layout_action(ctx, srcs, output_dir):
-  """Generates a flattened directory of sources.
-
-  For each file f in srcs, a file is emitted at output_dir/f.short_path.
-  Returns a dict mapping short_path to the emitted file.
-
-  Args:
-    ctx: the build context.
-    srcs: the set of input srcs to be flattened.
-    output_dir: the full output directory path into which the files are emitted.
-
-  Returns:
-    A map from input file short_path to File in output_dir.
-  """
-  commands = []
-  output_files = {}
-  # TODO(cbracken) extract next two lines to func
-  if not output_dir.endswith("/"):
-    output_dir += "/"
-  for src_file in srcs:
-    dest_file = ctx.actions.declare_file(output_dir + src_file.short_path)
-    dest_dir = dest_file.path[:dest_file.path.rfind("/")]
-    link_target = _relative_path(dest_dir, src_file.path)
-    commands += ["ln -s '%s' '%s'" % (link_target, dest_file.path)]
-    output_files[src_file.short_path] = dest_file
-
-  # Emit layout script.
-  layout_cmd = ctx.actions.declare_file(ctx.label.name + "_layout.sh")
-  ctx.actions.write(
-      output=layout_cmd,
-      content="#!/bin/bash\n" + "\n".join(commands),
-      is_executable=True,
-  )
-
-  # Invoke the layout action.
-  ctx.actions.run(
-      inputs=list(srcs),
-      outputs=output_files.values(),
-      executable=layout_cmd,
-      progress_message="Building flattened source layout for %s" % ctx,
-      mnemonic="DartLayout",
-  )
-  return output_files
+    """Generates a flattened directory of sources.
+
+    For each file f in srcs, a file is emitted at output_dir/f.short_path.
+    Returns a dict mapping short_path to the emitted file.
+
+    Args:
+      ctx: the build context.
+      srcs: the set of input srcs to be flattened.
+      output_dir: the full output directory path into which the files are emitted.
+
+    Returns:
+      A map from input file short_path to File in output_dir.
+    """
+    commands = []
+    output_files = {}
+
+    # TODO(cbracken) extract next two lines to func
+    if not output_dir.endswith("/"):
+        output_dir += "/"
+    for src_file in srcs:
+        dest_file = ctx.actions.declare_file(output_dir + src_file.short_path)
+        dest_dir = dest_file.path[:dest_file.path.rfind("/")]
+        link_target = _relative_path(dest_dir, src_file.path)
+        commands += ["ln -s '%s' '%s'" % (link_target, dest_file.path)]
+        output_files[src_file.short_path] = dest_file
+
+    # Emit layout script.
+    layout_cmd = ctx.actions.declare_file(ctx.label.name + "_layout.sh")
+    ctx.actions.write(
+        output = layout_cmd,
+        content = "#!/bin/bash\n" + "\n".join(commands),
+        is_executable = True,
+    )
+
+    # Invoke the layout action.
+    ctx.actions.run(
+        inputs = list(srcs),
+        outputs = output_files.values(),
+        executable = layout_cmd,
+        progress_message = "Building flattened source layout for %s" % ctx,
+        mnemonic = "DartLayout",
+    )
+    return output_files
diff --git a/dart/build_rules/proto.bzl b/dart/build_rules/proto.bzl
new file mode 100644
index 0000000..9644e40
--- /dev/null
+++ b/dart/build_rules/proto.bzl
@@ -0,0 +1,131 @@
+# Copyright 2016 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Dart rules for protocol buffers"""
+
+load("//dart/build_rules:internal.bzl", "make_dart_context", "collect_dart_context")
+load("@rules_proto//proto:defs.bzl", "ProtoInfo")
+
+def _generate_protoc_config(dart_ctx):
+  dart_ctxs = collect_dart_context(dart_ctx,
+                                   transitive=True,
+                                   include_self=True).values()
+
+  entries = []
+  for dc in dart_ctxs:
+    entries += ["|".join([dc.package, dc.label.package, dc.lib_root])]
+  return "BazelPackages=" + ";".join(entries)
+
+
+def protoc_gen_action(ctx,
+                      dart_ctx,
+                      direct_sources,
+                      transitive_sources,
+                      outputs):
+  cmd_inputs, _, cmd_input_manifests = ctx.resolve_command(tools=[ctx.attr._protoc_gen_dart])
+
+  # Protoc arguments.
+  inputs = cmd_inputs + transitive_sources.to_list()
+  plugin = "protoc-gen-dart=" + ctx.executable._protoc_gen_dart.path
+  bazel_options = _generate_protoc_config(dart_ctx)
+  genfiles_path = ctx.configuration.genfiles_dir.path
+  ctx.actions.run(
+      inputs=inputs,
+      outputs=outputs,
+      executable=ctx.executable._protocol_compiler,
+      arguments=[
+          "--plugin=" + plugin,
+          "--dart_out=" + bazel_options + ":" + genfiles_path,
+      ] + [s.path for s in direct_sources],
+      progress_message="Generating Dart proto files %s" % ctx,
+      mnemonic="DartProtoGen",
+      input_manifests=cmd_input_manifests,
+  )
+
+
+def _dart_proto_aspect_impl(target, ctx):
+  # Compute the generated outputs.
+  direct_sources = target[ProtoInfo].direct_sources
+  generated_outputs = []
+  for s in direct_sources:
+    gen_path = "lib/" + s.basename[:-len(".proto")] + ".pb.dart"
+    out_file = ctx.actions.declare_file(gen_path)
+    generated_outputs += [out_file]
+
+  # Create the package.
+  dart_ctx = make_dart_context(
+      label = target.label,
+      srcs = generated_outputs,
+      data = ctx.rule.attr.data,
+      deps = ctx.rule.attr.deps + ctx.attr._proto_libs_dart,
+  )
+
+  # Generate the Dart outputs.
+  protoc_gen_action(ctx,
+                    dart_ctx,
+                    direct_sources,
+                    target[ProtoInfo].transitive_sources,
+                    generated_outputs)
+
+  return struct(
+      dart=dart_ctx,
+  )
+
+
+_dart_proto_aspect_attrs = {
+    "_protocol_compiler": attr.label(
+        executable=True,
+        cfg="host",
+        default=Label("@com_google_protobuf//:protoc"),
+    ),
+    "_protoc_gen_dart": attr.label(
+      # TODO: FIX
+        default=Label(
+            "@dart_protobuf_protoc_plugin//:protoc_gen_dart"),
+        executable=True,
+        cfg="host",
+    ),
+    "_proto_libs_dart": attr.label_list(default=[
+        Label("@dart_fixnum//:fixnum_lib"),
+        Label("@dart_protobuf_protobuf//:protobuf_lib"),
+    ])
+}
+
+
+dart_proto_aspect = aspect(
+    implementation=_dart_proto_aspect_impl,
+    attr_aspects=["deps"],
+    attrs=_dart_proto_aspect_attrs,
+)
+
+
+def _dart_proto_library_impl(ctx):
+  dart_ctx = make_dart_context(ctx.label, deps=ctx.attr.deps)
+  return struct(
+      dart=dart_ctx,
+  )
+
+
+_dart_proto_library_attrs = {
+    "deps": attr.label_list(
+        providers=[ProtoInfo],
+        aspects=[dart_proto_aspect],
+    ),
+}
+
+
+dart_proto_library = rule(
+    implementation=_dart_proto_library_impl,
+    attrs=_dart_proto_library_attrs,
+)
diff --git a/dart/build_rules/repositories.bzl b/dart/build_rules/repositories.bzl
index 3c7c338..4fd8292 100644
--- a/dart/build_rules/repositories.bzl
+++ b/dart/build_rules/repositories.bzl
@@ -14,6 +14,8 @@
 
 """Repositories for Dart."""
 
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository", "new_git_repository")
+
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 
@@ -85,3 +87,86 @@ def dart_repositories():
       sha256 = macos_x64_sha,
       build_file_content = _DART_SDK_BUILD_FILE,
   )
+
+
+_FIXNUM_BUILD_FILE = """
+load("@//dart/build_rules:core.bzl", "dart_library")
+load("@//dart/build_rules:vm.bzl", "dart_vm_test")
+
+package(default_visibility = ["//visibility:public"])
+
+dart_library(
+    name = "fixnum_lib",
+    srcs = glob(["lib/**/*.dart"]),
+)
+"""
+
+_PROTOBUF_BUILD_FILE = """
+load("@//dart/build_rules:core.bzl", "dart_library")
+load("@//dart/build_rules:vm.bzl", "dart_vm_binary")
+
+package(default_visibility = ["//visibility:public"])
+
+dart_library(
+    name = "protobuf_lib",
+    srcs = glob(["lib/**/*.dart"]),
+)
+"""
+
+_PROTOC_PLUGIN_BUILD_FILE = """
+load("@//dart/build_rules:core.bzl", "dart_library")
+load("@//dart/build_rules:vm.bzl", "dart_vm_binary")
+
+package(default_visibility = ["//visibility:public"])
+
+dart_library(
+    name = "protoc_plugin_lib",
+    srcs = glob(["lib/**/*.dart"]),
+)
+
+dart_vm_binary(
+    name = "protoc_gen_dart",
+    srcs = ["bin/protoc_plugin.dart"],
+    script_file = "bin/protoc_plugin.dart",
+    deps = [":protoc_plugin_lib"],
+)
+"""
+
+def proto_repositories():
+
+  new_git_repository(
+      name = "dart_fixnum",
+      # tag = "1.0.0",
+      commit = "762b74f61696d414d0090c5dfc430572f5b4be0f", 
+      shallow_since = "1612551835 -0800",
+      remote = "https://github.com/dart-lang/fixnum",
+      build_file_content = _FIXNUM_BUILD_FILE
+  )
+
+  new_git_repository(
+      name = "dart_protobuf_protobuf",
+      # tag = "protobuf-v2.0.1",
+      commit = "23136dc01cf3daccf66ebb7f5a7578ec7c0dc7e6", 
+      shallow_since = "1638456183 +0100",
+      remote = "https://github.com/google/protobuf.dart",
+      build_file_content = _PROTOBUF_BUILD_FILE,
+      strip_prefix = "protobuf"
+  )
+
+  new_git_repository(
+      name = "dart_protobuf_protoc_plugin",
+      # tag = "protobuf-v2.0.1",
+      commit = "23136dc01cf3daccf66ebb7f5a7578ec7c0dc7e6", 
+      shallow_since = "1638456183 +0100",
+      remote = "https://github.com/google/protobuf.dart",
+      build_file_content = _PROTOC_PLUGIN_BUILD_FILE,
+      strip_prefix = "protoc_plugin"
+  )
+
+  git_repository(
+      name = "com_google_protobuf",
+      # tag = "v3.19.1",
+      commit = "7c40b2df1fdf6f414c1c18c789715a9c948a0725", 
+      shallow_since = "1635455273 -0700",
+      remote = "https://github.com/protocolbuffers/protobuf",
+  )
diff --git a/examples/proto_bin/BUILD b/examples/proto_bin/BUILD
new file mode 100644
index 0000000..f27acdb
--- /dev/null
+++ b/examples/proto_bin/BUILD
@@ -0,0 +1,25 @@
+load("@rules_proto//proto:defs.bzl", "proto_library")
+load("//dart/build_rules:proto.bzl", "dart_proto_library")
+load("//dart/build_rules:vm.bzl", "dart_vm_binary")
+
+package(default_visibility = ["//visibility:public"])
+
+proto_library(
+    name = "review_proto",
+    srcs = ["review.proto"],
+    deps = [
+        "//examples/proto_lib:person_proto",
+    ],
+)
+
+dart_proto_library(
+    name = "review_proto_dart",
+    deps = [":review_proto"],
+)
+
+dart_vm_binary(
+    name = "proto_bin",
+    srcs = ["bin/hello_proto.dart"],
+    script_file = "bin/hello_proto.dart",
+    deps = [":review_proto_dart"],
+)
diff --git a/examples/proto_bin/bin/hello_proto.dart b/examples/proto_bin/bin/hello_proto.dart
new file mode 100644
index 0000000..69e519c
--- /dev/null
+++ b/examples/proto_bin/bin/hello_proto.dart
@@ -0,0 +1,34 @@
+import 'package:examples.proto_lib/device.pb.dart';
+import 'package:examples.proto_lib/person.pb.dart';
+import 'package:examples.proto_bin/review.pb.dart';
+
+String format(Review review) {
+  var date = new DateTime.fromMillisecondsSinceEpoch(review.date);
+
+  var buf = new StringBuffer();
+  buf.writeln('Review of ${review.device.brand} ${review.device.model}');
+  buf.writeln('by ${review.person.firstname} ${review.person.lastname}, $date');
+  buf.writeln('\n${review.text}');
+  return buf.toString();
+}
+
+Review fetchReview() {
+  var fred = new Person()
+    ..firstname = 'Fred'
+    ..lastname = 'Fhqwhgads';
+  var motoX = new Device()
+    ..brand = 'Motorola'
+    ..model = 'Moto X';
+  var review = new Review()
+    ..person = fred
+    ..device = motoX
+    ..date = new DateTime(2016, 01, 31).millisecondsSinceEpoch
+    ..text = 'Hello, proto!';
+  return review;
+}
+
+main() {
+  var review = fetchReview();
+  var displayText = format(review);
+  print(displayText);
+}
diff --git a/examples/proto_bin/review.proto b/examples/proto_bin/review.proto
new file mode 100644
index 0000000..edb6d1f
--- /dev/null
+++ b/examples/proto_bin/review.proto
@@ -0,0 +1,13 @@
+syntax = "proto2";
+
+import 'examples/proto_lib/person.proto';
+import 'examples/proto_lib/device.proto';
+
+package ex;
+
+message Review {
+  required ex.Person person = 1;
+  required ex.Device device = 2;
+  required int64 date = 3;
+  required string text = 4;
+}
diff --git a/examples/proto_lib/BUILD b/examples/proto_lib/BUILD
new file mode 100644
index 0000000..83ac6f1
--- /dev/null
+++ b/examples/proto_lib/BUILD
@@ -0,0 +1,11 @@
+load("@rules_proto//proto:defs.bzl", "proto_library")
+
+package(default_visibility = ["//visibility:public"])
+
+proto_library(
+    name = "person_proto",
+    srcs = [
+        "person.proto",
+        "device.proto",
+    ],
+)
diff --git a/examples/proto_lib/device.proto b/examples/proto_lib/device.proto
new file mode 100644
index 0000000..eb23752
--- /dev/null
+++ b/examples/proto_lib/device.proto
@@ -0,0 +1,9 @@
+syntax = "proto2";
+
+package ex;
+
+message Device {
+  required string brand = 1;
+  required string model = 2;
+}
+
diff --git a/examples/proto_lib/person.proto b/examples/proto_lib/person.proto
new file mode 100644
index 0000000..9afcfdd
--- /dev/null
+++ b/examples/proto_lib/person.proto
@@ -0,0 +1,8 @@
+syntax = "proto2";
+
+package ex;
+
+message Person {
+  required string firstname = 1;
+  required string lastname = 2;
+}
diff --git a/tools/install_deps.sh b/tools/install_deps.sh
deleted file mode 100755
index 2ff7f21..0000000
--- a/tools/install_deps.sh
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/bin/sh
-
-BAZEL_VERSION=4.0.0
-
-linux_install() {
-  echo "============================================================"
-  echo "Installing Bazel $BAZEL_VERSION on Linux"
-  echo "============================================================"
-
-  sudo apt -y update
-  sudo apt -y install apt-transport-https curl gnupg
-  curl -fsSL https://bazel.build/bazel-release.pub.gpg | gpg --dearmor > bazel.gpg
-  sudo mv bazel.gpg /etc/apt/trusted.gpg.d/
-  echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list
-  sudo apt update
-  sudo apt -y install bazel-$BAZEL_VERSION
-  exit 0
-}
-
-macos_install() {
-  echo "============================================================"
-  echo "Installing Bazel $BAZEL_VERSION on macOS"
-  echo "============================================================"
-
-  curl -fLO "https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/bazel-${BAZEL_VERSION}-installer-darwin-x86_64.sh"
-  chmod +x "bazel-${BAZEL_VERSION}-installer-darwin-x86_64.sh"
-  sudo ./bazel-${BAZEL_VERSION}-installer-darwin-x86_64.sh
-  exit 0
-}
-
-# Main entry point.
-case "`uname -s`" in
-  Linux*) linux_install;;
-  Darwin*) macos_install;;
-esac
-
-echo "ERROR: unknown operating system"
-exit 1