internal/node/node.bzl - third_party/github/bazel-contrib/rules_nodejs - Git at Google

 # Copyright 2017 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.

 """Executing programs

 These rules run the node executable with the given sources.

 They support module mapping: any targets in the transitive dependencies with
 a `module_name` attribute can be `require`d by that name.
 """

 load("@build_bazel_rules_nodejs//internal/common:node_module_info.bzl", "NodeModuleSources", "collect_node_modules_aspect")
 load("//internal/common:expand_into_runfiles.bzl", "expand_location_into_runfiles")
 load("//internal/common:module_mappings.bzl", "module_mappings_runtime_aspect")
 load("//internal/common:sources_aspect.bzl", "sources_aspect")
 load("//internal/common:windows_utils.bzl", "create_windows_native_launcher_script", "is_windows")

 def _trim_package_node_modules(package_name):
     # trim a package name down to its path prior to a node_modules
     # segment. 'foo/node_modules/bar' would become 'foo' and
     # 'node_modules/bar' would become ''
     segments = []
     for n in package_name.split("/"):
         if n == "node_modules":
             break
         segments += [n]
     return "/".join(segments)

 def _compute_node_modules_root(ctx):
     """Computes the node_modules root from the node_modules and deps attributes.

     Args:
       ctx: the skylark execution context

     Returns:
       The node_modules root as a string
     """
     node_modules_root = None
     if ctx.attr.node_modules:
         if NodeModuleSources in ctx.attr.node_modules:
             node_modules_root = "/".join([ctx.attr.node_modules[NodeModuleSources].workspace, "node_modules"])
         elif ctx.files.node_modules:
             # ctx.files.node_modules is not an empty list
             workspace = ctx.attr.node_modules.label.workspace_root.split("/")[1] if ctx.attr.node_modules.label.workspace_root else ctx.workspace_name
             node_modules_root = "/".join([f for f in [
                 workspace,
                 _trim_package_node_modules(ctx.attr.node_modules.label.package),
                 "node_modules",
             ] if f])
     for d in ctx.attr.data:
         if NodeModuleSources in d:
             possible_root = "/".join([d[NodeModuleSources].workspace, "node_modules"])
             if not node_modules_root:
                 node_modules_root = possible_root
             elif node_modules_root != possible_root:
                 fail("All npm dependencies need to come from a single workspace. Found '%s' and '%s'." % (node_modules_root, possible_root))
     if not node_modules_root:
         # there are no fine grained deps and the node_modules attribute is an empty filegroup
         # but we still need a node_modules_root even if its empty
         workspace = ctx.attr.node_modules.label.workspace_root.split("/")[1] if ctx.attr.node_modules.label.workspace_root else ctx.workspace_name
         node_modules_root = "/".join([f for f in [
             workspace,
             ctx.attr.node_modules.label.package,
             "node_modules",
         ] if f])
     return node_modules_root

 def _write_loader_script(ctx):
     # Generates the JavaScript snippet of module roots mappings, with each entry
     # in the form:
     #   {module_name: /^mod_name\b/, module_root: 'path/to/mod_name'}
     module_mappings = []
     for d in ctx.attr.data:
         if hasattr(d, "runfiles_module_mappings"):
             for [mn, mr] in d.runfiles_module_mappings.items():
                 escaped = mn.replace("/", "\/").replace(".", "\.")
                 mapping = "{module_name: /^%s\\b/, module_root: '%s'}" % (escaped, mr)
                 module_mappings.append(mapping)

     node_modules_root = _compute_node_modules_root(ctx)

     if len(ctx.attr.entry_point.files.to_list()) != 1:
         fail("labels in entry_point must contain exactly one file")

     entry_point_path = _to_manifest_path(ctx, ctx.file.entry_point)

     # If the entry point specified is a typescript file then set the entry
     # point to the corresponding .js file
     if entry_point_path.endswith(".ts"):
         entry_point_path = entry_point_path[:-3] + ".js"

     ctx.actions.expand_template(
         template = ctx.file._loader_template,
         output = ctx.outputs.loader,
         substitutions = {
             "TEMPLATED_bin_dir": ctx.bin_dir.path,
             "TEMPLATED_bootstrap": "\n  " + ",\n  ".join(
                 ["\"" + d + "\"" for d in ctx.attr.bootstrap],
             ),
             "TEMPLATED_entry_point": entry_point_path,
             "TEMPLATED_gen_dir": ctx.genfiles_dir.path,
             "TEMPLATED_install_source_map_support": str(ctx.attr.install_source_map_support).lower(),
             "TEMPLATED_module_roots": "\n  " + ",\n  ".join(module_mappings),
             "TEMPLATED_node_modules_root": node_modules_root,
             "TEMPLATED_target": str(ctx.label),
             "TEMPLATED_user_workspace_name": ctx.workspace_name,
         },
         is_executable = True,
     )

 # Avoid using non-normalized paths (workspace/../other_workspace/path)
 def _to_manifest_path(ctx, file):
     if file.short_path.startswith("../"):
         return file.short_path[3:]
     else:
         return ctx.workspace_name + "/" + file.short_path

 def _nodejs_binary_impl(ctx):
     node_modules = depset(ctx.files.node_modules)

     # Also include files from npm fine grained deps as inputs.
     # These deps are identified by the NodeModuleSources provider.
     for d in ctx.attr.data:
         if NodeModuleSources in d:
             node_modules = depset(transitive = [node_modules, d[NodeModuleSources].sources])

     # Using a depset will allow us to avoid flattening files and sources
     # inside this loop. This should reduce the performances hits,
     # since we don't need to call .to_list()
     sources = depset()

     for d in ctx.attr.data:
         if hasattr(d, "node_sources"):
             sources = depset(transitive = [sources, d.node_sources])
         if hasattr(d, "files"):
             sources = depset(transitive = [sources, d.files])

     _write_loader_script(ctx)

     script_path = _to_manifest_path(ctx, ctx.outputs.loader)

     env_vars = "export BAZEL_TARGET=%s\n" % ctx.label
     for k in ctx.attr.configuration_env_vars + ctx.attr.default_env_vars:
         if k in ctx.var.keys():
             env_vars += "export %s=\"%s\"\n" % (k, ctx.var[k])

     expected_exit_code = 0
     if hasattr(ctx.attr, "expected_exit_code"):
         expected_exit_code = ctx.attr.expected_exit_code

     node_tool_info = ctx.toolchains["@build_bazel_rules_nodejs//toolchains/node:toolchain_type"].nodeinfo

     # Make a copy so we don't try to mutate a frozen object
     node_tool_files = node_tool_info.tool_files[:]
     if node_tool_info.target_tool_path == "":
         # If tool_path is empty and tool_target is None then there is no local
         # node tool, we will just print a nice error message if the user
         # attempts to do bazel run
         fail("The node toolchain was not properly configured so %s cannot be executed. Make sure that target_tool_path or target_tool is set." % ctx.attr.name)

     node_tool_files.append(ctx.file._link_modules_script)

     if not ctx.outputs.templated_args_file:
         templated_args = ctx.attr.templated_args
     else:
         # Distribute the templated_args between the params file and the node options
         params = []
         templated_args = []
         for a in ctx.attr.templated_args:
             if a.startswith("--node_options="):
                 templated_args.append(a)
             else:
                 params.append(a)

         # Put the params into the params file
         ctx.actions.write(
             output = ctx.outputs.templated_args_file,
             content = "\n".join([expand_location_into_runfiles(ctx, p) for p in params]),
             is_executable = False,
         )

         # after the node_options args, pass the params file arg
         templated_args.append(ctx.outputs.templated_args_file.short_path)

         # also be sure to include the params file in the program inputs
         node_tool_files.append(ctx.outputs.templated_args_file)

     substitutions = {
         "TEMPLATED_args": " ".join([
             expand_location_into_runfiles(ctx, a)
             for a in templated_args
         ]),
         "TEMPLATED_env_vars": env_vars,
         "TEMPLATED_expected_exit_code": str(expected_exit_code),
         "TEMPLATED_link_modules_script": _to_manifest_path(ctx, ctx.file._link_modules_script),
         "TEMPLATED_node": node_tool_info.target_tool_path,
         "TEMPLATED_repository_args": _to_manifest_path(ctx, ctx.file._repository_args),
         "TEMPLATED_script_path": script_path,
     }
     ctx.actions.expand_template(
         template = ctx.file._launcher_template,
         output = ctx.outputs.script,
         substitutions = substitutions,
         is_executable = True,
     )

     runfiles = depset(node_tool_files + ctx.files._bash_runfile_helpers + [ctx.outputs.loader, ctx.file._repository_args], transitive = [sources, node_modules])

     if is_windows(ctx):
         runfiles = depset([ctx.outputs.script], transitive = [runfiles])
         executable = create_windows_native_launcher_script(ctx, ctx.outputs.script)
     else:
         executable = ctx.outputs.script

     # entry point is only needed in runfiles if it is a .js file
     if ctx.file.entry_point.extension == "js":
         runfiles = depset([ctx.file.entry_point], transitive = [runfiles])

     return [DefaultInfo(
         executable = executable,
         runfiles = ctx.runfiles(
             transitive_files = runfiles,
             files = node_tool_files + [
                         ctx.outputs.loader,
                     ] + ctx.files._source_map_support_files +

                     # We need this call to the list of Files.
                     # Calling the .to_list() method may have some perfs hits,
                     # so we should be running this method only once per rule.
                     # see: https://docs.bazel.build/versions/master/skylark/depsets.html#performance
                     node_modules.to_list() + sources.to_list(),
             collect_data = True,
         ),
     )]

 _NODEJS_EXECUTABLE_ATTRS = {
     "bootstrap": attr.string_list(
         doc = """JavaScript modules to be loaded before the entry point.
         For example, Angular uses this to patch the Jasmine async primitives for
         zone.js before the first `describe`.
         """,
         default = [],
     ),
     "configuration_env_vars": attr.string_list(
         doc = """Pass these configuration environment variables to the resulting binary.
         Chooses a subset of the configuration environment variables (taken from `ctx.var`), which also
         includes anything specified via the --define flag.
         Note, this can lead to different outputs produced by this rule.""",
         default = [],
     ),
     "data": attr.label_list(
         doc = """Runtime dependencies which may be loaded during execution.""",
         allow_files = True,
         aspects = [sources_aspect, module_mappings_runtime_aspect, collect_node_modules_aspect],
     ),
     "default_env_vars": attr.string_list(
         doc = """Default environment variables that are added to `configuration_env_vars`.

 This is separate from the default of `configuration_env_vars` so that a user can set `configuration_env_vars`
 without losing the defaults that should be set in most cases.

 The set of default  environment variables is:

 - `DEBUG`: rules use this environment variable to turn on debug information in their output artifacts
 - `VERBOSE_LOGS`: rules use this environment variable to turn on debug output in their logs
 """,
         default = ["DEBUG", "VERBOSE_LOGS"],
     ),
     "entry_point": attr.label(
         doc = """The script which should be executed first, usually containing a main function.

 If the entry JavaScript file belongs to the same package (as the BUILD file),
 you can simply reference it by its relative name to the package directory:

 ```
 nodejs_binary(
     name = "my_binary",
     ...
     entry_point = ":file.js",
 )
 ```

 You can specify the entry point as a typescript file so long as you also include
 the ts_library target in data:

 ```
 ts_library(
     name = "main",
     srcs = ["main.ts"],
 )

 nodejs_binary(
     name = "bin",
     data = [":main"]
     entry_point = ":main.ts",
 )
 ```

 The rule will use the corresponding `.js` output of the ts_library rule as the entry point.

 If the entry point target is a rule, it should produce a single JavaScript entry file that will be passed to the nodejs_binary rule.
 For example:

 ```
 filegroup(
     name = "entry_file",
     srcs = ["main.js"],
 )

 nodejs_binary(
     name = "my_binary",
     entry_point = ":entry_file",
 )
 ```

 The entry_point can also be a label in another workspace:

 ```
 nodejs_binary(
     name = "history-server",
     entry_point = "@npm//:node_modules/history-server/modules/cli.js",
     data = ["@npm//history-server"],
 )
 ```
 """,
         mandatory = True,
         allow_single_file = True,
     ),
     "install_source_map_support": attr.bool(
         doc = """Install the source-map-support package.
         Enable this to get stack traces that point to original sources, e.g. if the program was written
         in TypeScript.""",
         default = True,
     ),
     "node_modules": attr.label(
         doc = """The npm packages which should be available to `require()` during
         execution.

 This attribute is DEPRECATED. As of version 0.13.0 the recommended approach
 to npm dependencies is to use fine grained npm dependencies which are setup
 with the `yarn_install` or `npm_install` rules. For example, in targets
 that used a `//:node_modules` filegroup,

 ```
 nodejs_binary(
     name = "my_binary",
     ...
     node_modules = "//:node_modules",
 )
 ```

 which specifies all files within the `//:node_modules` filegroup
 to be inputs to the `my_binary`. Using fine grained npm dependencies,
 `my_binary` is defined with only the npm dependencies that are
 needed:

 ```
 nodejs_binary(
     name = "my_binary",
     ...
     data = [
         "@npm//foo",
         "@npm//bar",
         ...
     ],
 )
 ```

 In this case, only the `foo` and `bar` npm packages and their
 transitive deps are includes as inputs to the `my_binary` target
 which reduces the time required to setup the runfiles for this
 target (see https://github.com/bazelbuild/bazel/issues/5153).

 The @npm external repository and the fine grained npm package
 targets are setup using the `yarn_install` or `npm_install` rule
 in your WORKSPACE file:

 yarn_install(
     name = "npm",
     package_json = "//:package.json",
     yarn_lock = "//:yarn.lock",
 )

 For other rules such as `jasmine_node_test`, fine grained
 npm dependencies are specified in the `deps` attribute:

 ```
 jasmine_node_test(
     name = "my_test",
     ...
     deps = [
         "@npm//jasmine",
         "@npm//foo",
         "@npm//bar",
         ...
     ],
 )
 ```
 """,
         default = Label("//:node_modules_none"),
     ),
     "templated_args": attr.string_list(
         doc = """Arguments which are passed to every execution of the program.
         To pass a node startup option, prepend it with `--node_options=`, e.g.
         `--node_options=--preserve-symlinks`
         """,
     ),
     "templated_args_file": attr.output(
         mandatory = False,
         doc = """If specified, arguments specified in `templated_args` are instead written to this file,
         which is then passed as an argument to the program. Arguments prefixed with `--node_options=` are
         passed directly to node and not included in the params file.
         """,
     ),
     "_bash_runfile_helpers": attr.label(default = Label("@bazel_tools//tools/bash/runfiles")),
     "_launcher_template": attr.label(
         default = Label("//internal/node:node_launcher.sh"),
         allow_single_file = True,
     ),
     "_link_modules_script": attr.label(
         default = Label("//internal/linker:index.js"),
         allow_single_file = True,
     ),
     "_loader_template": attr.label(
         default = Label("//internal/node:node_loader.js"),
         allow_single_file = True,
     ),
     "_repository_args": attr.label(
         default = Label("@nodejs//:bin/node_repo_args.sh"),
         allow_single_file = True,
     ),
     "_source_map_support_files": attr.label_list(
         default = [
             Label("//third_party/github.com/buffer-from:contents"),
             Label("//third_party/github.com/source-map:contents"),
             Label("//third_party/github.com/source-map-support:contents"),
         ],
         allow_files = True,
     ),
 }

 _NODEJS_EXECUTABLE_OUTPUTS = {
     "loader": "%{name}_loader.js",
     "script": "%{name}.sh",
 }

 # The name of the declared rule appears in
 # bazel query --output=label_kind
 # So we make these match what the user types in their BUILD file
 # and duplicate the definitions to give two distinct symbols.
 nodejs_binary = rule(
     implementation = _nodejs_binary_impl,
     attrs = _NODEJS_EXECUTABLE_ATTRS,
     doc = "Runs some JavaScript code in NodeJS.",
     executable = True,
     outputs = _NODEJS_EXECUTABLE_OUTPUTS,
     toolchains = [
         "@build_bazel_rules_nodejs//toolchains/node:toolchain_type",
         "@bazel_tools//tools/sh:toolchain_type",
     ],
 )

 nodejs_test = rule(
     implementation = _nodejs_binary_impl,
     attrs = dict(_NODEJS_EXECUTABLE_ATTRS, **{
         "expected_exit_code": attr.int(
             doc = "The expected exit code for the test. Defaults to 0.",
             default = 0,
         ),
     }),
     doc = """
 Identical to `nodejs_binary`, except this can be used with `bazel test` as well.
 When the binary returns zero exit code, the test passes; otherwise it fails.

 `nodejs_test` is a convenient way to write a novel kind of test based on running
 your own test runner. For example, the `ts-api-guardian` library has a way to
 assert the public API of a TypeScript program, and uses `nodejs_test` here:
 https://github.com/angular/angular/blob/master/tools/ts-api-guardian/index.bzl

 If you just want to run a standard test using a test runner like Karma or Jasmine,
 use the specific rules for those test runners, e.g. `jasmine_node_test`.

 To debug a Node.js test, we recommend saving a group of flags together in a "config".
 Put this in your `tools/bazel.rc` so it's shared with your team:
 ```
 # Enable debugging tests with --config=debug
 test:debug --test_arg=--node_options=--inspect-brk --test_output=streamed --test_strategy=exclusive --test_timeout=9999 --nocache_test_results
 ```

 Now you can add `--config=debug` to any `bazel test` command line.
 The runtime will pause before executing the program, allowing you to connect a
 remote debugger.
 """,
     test = True,
     outputs = _NODEJS_EXECUTABLE_OUTPUTS,
     toolchains = [
         "@build_bazel_rules_nodejs//toolchains/node:toolchain_type",
         "@bazel_tools//tools/sh:toolchain_type",
     ],
 )
	# Copyright 2017 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.

	"""Executing programs

	These rules run the node executable with the given sources.

	They support module mapping: any targets in the transitive dependencies with
	a `module_name` attribute can be `require`d by that name.
	"""

	load("@build_bazel_rules_nodejs//internal/common:node_module_info.bzl", "NodeModuleSources", "collect_node_modules_aspect")
	load("//internal/common:expand_into_runfiles.bzl", "expand_location_into_runfiles")
	load("//internal/common:module_mappings.bzl", "module_mappings_runtime_aspect")
	load("//internal/common:sources_aspect.bzl", "sources_aspect")
	load("//internal/common:windows_utils.bzl", "create_windows_native_launcher_script", "is_windows")

	def _trim_package_node_modules(package_name):
	# trim a package name down to its path prior to a node_modules
	# segment. 'foo/node_modules/bar' would become 'foo' and
	# 'node_modules/bar' would become ''
	segments = []
	for n in package_name.split("/"):
	if n == "node_modules":
	break
	segments += [n]
	return "/".join(segments)

	def _compute_node_modules_root(ctx):
	"""Computes the node_modules root from the node_modules and deps attributes.

	Args:
	ctx: the skylark execution context

	Returns:
	The node_modules root as a string
	"""
	node_modules_root = None
	if ctx.attr.node_modules:
	if NodeModuleSources in ctx.attr.node_modules:
	node_modules_root = "/".join([ctx.attr.node_modules[NodeModuleSources].workspace, "node_modules"])
	elif ctx.files.node_modules:
	# ctx.files.node_modules is not an empty list
	workspace = ctx.attr.node_modules.label.workspace_root.split("/")[1] if ctx.attr.node_modules.label.workspace_root else ctx.workspace_name
	node_modules_root = "/".join([f for f in [
	workspace,
	_trim_package_node_modules(ctx.attr.node_modules.label.package),
	"node_modules",
	] if f])
	for d in ctx.attr.data:
	if NodeModuleSources in d:
	possible_root = "/".join([d[NodeModuleSources].workspace, "node_modules"])
	if not node_modules_root:
	node_modules_root = possible_root
	elif node_modules_root != possible_root:
	fail("All npm dependencies need to come from a single workspace. Found '%s' and '%s'." % (node_modules_root, possible_root))
	if not node_modules_root:
	# there are no fine grained deps and the node_modules attribute is an empty filegroup
	# but we still need a node_modules_root even if its empty
	workspace = ctx.attr.node_modules.label.workspace_root.split("/")[1] if ctx.attr.node_modules.label.workspace_root else ctx.workspace_name
	node_modules_root = "/".join([f for f in [
	workspace,
	ctx.attr.node_modules.label.package,
	"node_modules",
	] if f])
	return node_modules_root

	def _write_loader_script(ctx):
	# Generates the JavaScript snippet of module roots mappings, with each entry
	# in the form:
	# {module_name: /^mod_name\b/, module_root: 'path/to/mod_name'}
	module_mappings = []
	for d in ctx.attr.data:
	if hasattr(d, "runfiles_module_mappings"):
	for [mn, mr] in d.runfiles_module_mappings.items():
	escaped = mn.replace("/", "\/").replace(".", "\.")
	mapping = "{module_name: /^%s\\b/, module_root: '%s'}" % (escaped, mr)
	module_mappings.append(mapping)

	node_modules_root = _compute_node_modules_root(ctx)

	if len(ctx.attr.entry_point.files.to_list()) != 1:
	fail("labels in entry_point must contain exactly one file")

	entry_point_path = _to_manifest_path(ctx, ctx.file.entry_point)

	# If the entry point specified is a typescript file then set the entry
	# point to the corresponding .js file
	if entry_point_path.endswith(".ts"):
	entry_point_path = entry_point_path[:-3] + ".js"

	ctx.actions.expand_template(
	template = ctx.file._loader_template,
	output = ctx.outputs.loader,
	substitutions = {
	"TEMPLATED_bin_dir": ctx.bin_dir.path,
	"TEMPLATED_bootstrap": "\n " + ",\n ".join(
	["\"" + d + "\"" for d in ctx.attr.bootstrap],
	),
	"TEMPLATED_entry_point": entry_point_path,
	"TEMPLATED_gen_dir": ctx.genfiles_dir.path,
	"TEMPLATED_install_source_map_support": str(ctx.attr.install_source_map_support).lower(),
	"TEMPLATED_module_roots": "\n " + ",\n ".join(module_mappings),
	"TEMPLATED_node_modules_root": node_modules_root,
	"TEMPLATED_target": str(ctx.label),
	"TEMPLATED_user_workspace_name": ctx.workspace_name,
	},
	is_executable = True,
	)

	# Avoid using non-normalized paths (workspace/../other_workspace/path)
	def _to_manifest_path(ctx, file):
	if file.short_path.startswith("../"):
	return file.short_path[3:]
	else:
	return ctx.workspace_name + "/" + file.short_path

	def _nodejs_binary_impl(ctx):
	node_modules = depset(ctx.files.node_modules)

	# Also include files from npm fine grained deps as inputs.
	# These deps are identified by the NodeModuleSources provider.
	for d in ctx.attr.data:
	if NodeModuleSources in d:
	node_modules = depset(transitive = [node_modules, d[NodeModuleSources].sources])

	# Using a depset will allow us to avoid flattening files and sources
	# inside this loop. This should reduce the performances hits,
	# since we don't need to call .to_list()
	sources = depset()

	for d in ctx.attr.data:
	if hasattr(d, "node_sources"):
	sources = depset(transitive = [sources, d.node_sources])
	if hasattr(d, "files"):
	sources = depset(transitive = [sources, d.files])

	_write_loader_script(ctx)

	script_path = _to_manifest_path(ctx, ctx.outputs.loader)

	env_vars = "export BAZEL_TARGET=%s\n" % ctx.label
	for k in ctx.attr.configuration_env_vars + ctx.attr.default_env_vars:
	if k in ctx.var.keys():
	env_vars += "export %s=\"%s\"\n" % (k, ctx.var[k])

	expected_exit_code = 0
	if hasattr(ctx.attr, "expected_exit_code"):
	expected_exit_code = ctx.attr.expected_exit_code

	node_tool_info = ctx.toolchains["@build_bazel_rules_nodejs//toolchains/node:toolchain_type"].nodeinfo

	# Make a copy so we don't try to mutate a frozen object
	node_tool_files = node_tool_info.tool_files[:]
	if node_tool_info.target_tool_path == "":
	# If tool_path is empty and tool_target is None then there is no local
	# node tool, we will just print a nice error message if the user
	# attempts to do bazel run
	fail("The node toolchain was not properly configured so %s cannot be executed. Make sure that target_tool_path or target_tool is set." % ctx.attr.name)

	node_tool_files.append(ctx.file._link_modules_script)

	if not ctx.outputs.templated_args_file:
	templated_args = ctx.attr.templated_args
	else:
	# Distribute the templated_args between the params file and the node options
	params = []
	templated_args = []
	for a in ctx.attr.templated_args:
	if a.startswith("--node_options="):
	templated_args.append(a)
	else:
	params.append(a)

	# Put the params into the params file
	ctx.actions.write(
	output = ctx.outputs.templated_args_file,
	content = "\n".join([expand_location_into_runfiles(ctx, p) for p in params]),
	is_executable = False,
	)

	# after the node_options args, pass the params file arg
	templated_args.append(ctx.outputs.templated_args_file.short_path)

	# also be sure to include the params file in the program inputs
	node_tool_files.append(ctx.outputs.templated_args_file)

	substitutions = {
	"TEMPLATED_args": " ".join([
	expand_location_into_runfiles(ctx, a)
	for a in templated_args
	]),
	"TEMPLATED_env_vars": env_vars,
	"TEMPLATED_expected_exit_code": str(expected_exit_code),
	"TEMPLATED_link_modules_script": _to_manifest_path(ctx, ctx.file._link_modules_script),
	"TEMPLATED_node": node_tool_info.target_tool_path,
	"TEMPLATED_repository_args": _to_manifest_path(ctx, ctx.file._repository_args),
	"TEMPLATED_script_path": script_path,
	}
	ctx.actions.expand_template(
	template = ctx.file._launcher_template,
	output = ctx.outputs.script,
	substitutions = substitutions,
	is_executable = True,
	)

	runfiles = depset(node_tool_files + ctx.files._bash_runfile_helpers + [ctx.outputs.loader, ctx.file._repository_args], transitive = [sources, node_modules])

	if is_windows(ctx):
	runfiles = depset([ctx.outputs.script], transitive = [runfiles])
	executable = create_windows_native_launcher_script(ctx, ctx.outputs.script)
	else:
	executable = ctx.outputs.script

	# entry point is only needed in runfiles if it is a .js file
	if ctx.file.entry_point.extension == "js":
	runfiles = depset([ctx.file.entry_point], transitive = [runfiles])

	return [DefaultInfo(
	executable = executable,
	runfiles = ctx.runfiles(
	transitive_files = runfiles,
	files = node_tool_files + [
	ctx.outputs.loader,
	] + ctx.files._source_map_support_files +

	# We need this call to the list of Files.
	# Calling the .to_list() method may have some perfs hits,
	# so we should be running this method only once per rule.
	# see: https://docs.bazel.build/versions/master/skylark/depsets.html#performance
	node_modules.to_list() + sources.to_list(),
	collect_data = True,
	),
	)]

	_NODEJS_EXECUTABLE_ATTRS = {
	"bootstrap": attr.string_list(
	doc = """JavaScript modules to be loaded before the entry point.
	For example, Angular uses this to patch the Jasmine async primitives for
	zone.js before the first `describe`.
	""",
	default = [],
	),
	"configuration_env_vars": attr.string_list(
	doc = """Pass these configuration environment variables to the resulting binary.
	Chooses a subset of the configuration environment variables (taken from `ctx.var`), which also
	includes anything specified via the --define flag.
	Note, this can lead to different outputs produced by this rule.""",
	default = [],
	),
	"data": attr.label_list(
	doc = """Runtime dependencies which may be loaded during execution.""",
	allow_files = True,
	aspects = [sources_aspect, module_mappings_runtime_aspect, collect_node_modules_aspect],
	),
	"default_env_vars": attr.string_list(
	doc = """Default environment variables that are added to `configuration_env_vars`.

	This is separate from the default of `configuration_env_vars` so that a user can set `configuration_env_vars`
	without losing the defaults that should be set in most cases.

	The set of default environment variables is:

	- `DEBUG`: rules use this environment variable to turn on debug information in their output artifacts
	- `VERBOSE_LOGS`: rules use this environment variable to turn on debug output in their logs
	""",
	default = ["DEBUG", "VERBOSE_LOGS"],
	),
	"entry_point": attr.label(
	doc = """The script which should be executed first, usually containing a main function.

	If the entry JavaScript file belongs to the same package (as the BUILD file),
	you can simply reference it by its relative name to the package directory:

	```
	nodejs_binary(
	name = "my_binary",
	...
	entry_point = ":file.js",
	)
	```

	You can specify the entry point as a typescript file so long as you also include
	the ts_library target in data:

	```
	ts_library(
	name = "main",
	srcs = ["main.ts"],
	)

	nodejs_binary(
	name = "bin",
	data = [":main"]
	entry_point = ":main.ts",
	)
	```

	The rule will use the corresponding `.js` output of the ts_library rule as the entry point.

	If the entry point target is a rule, it should produce a single JavaScript entry file that will be passed to the nodejs_binary rule.
	For example:

	```
	filegroup(
	name = "entry_file",
	srcs = ["main.js"],
	)

	nodejs_binary(
	name = "my_binary",
	entry_point = ":entry_file",
	)
	```

	The entry_point can also be a label in another workspace:

	```
	nodejs_binary(
	name = "history-server",
	entry_point = "@npm//:node_modules/history-server/modules/cli.js",
	data = ["@npm//history-server"],
	)
	```
	""",
	mandatory = True,
	allow_single_file = True,
	),
	"install_source_map_support": attr.bool(
	doc = """Install the source-map-support package.
	Enable this to get stack traces that point to original sources, e.g. if the program was written
	in TypeScript.""",
	default = True,
	),
	"node_modules": attr.label(
	doc = """The npm packages which should be available to `require()` during
	execution.

	This attribute is DEPRECATED. As of version 0.13.0 the recommended approach
	to npm dependencies is to use fine grained npm dependencies which are setup
	with the `yarn_install` or `npm_install` rules. For example, in targets
	that used a `//:node_modules` filegroup,

	```
	nodejs_binary(
	name = "my_binary",
	...
	node_modules = "//:node_modules",
	)
	```

	which specifies all files within the `//:node_modules` filegroup
	to be inputs to the `my_binary`. Using fine grained npm dependencies,
	`my_binary` is defined with only the npm dependencies that are
	needed:

	```
	nodejs_binary(
	name = "my_binary",
	...
	data = [
	"@npm//foo",
	"@npm//bar",
	...
	],
	)
	```

	In this case, only the `foo` and `bar` npm packages and their
	transitive deps are includes as inputs to the `my_binary` target
	which reduces the time required to setup the runfiles for this
	target (see https://github.com/bazelbuild/bazel/issues/5153).

	The @npm external repository and the fine grained npm package
	targets are setup using the `yarn_install` or `npm_install` rule
	in your WORKSPACE file:

	yarn_install(
	name = "npm",
	package_json = "//:package.json",
	yarn_lock = "//:yarn.lock",
	)

	For other rules such as `jasmine_node_test`, fine grained
	npm dependencies are specified in the `deps` attribute:

	```
	jasmine_node_test(
	name = "my_test",
	...
	deps = [
	"@npm//jasmine",
	"@npm//foo",
	"@npm//bar",
	...
	],
	)
	```
	""",
	default = Label("//:node_modules_none"),
	),
	"templated_args": attr.string_list(
	doc = """Arguments which are passed to every execution of the program.
	To pass a node startup option, prepend it with `--node_options=`, e.g.
	`--node_options=--preserve-symlinks`
	""",
	),
	"templated_args_file": attr.output(
	mandatory = False,
	doc = """If specified, arguments specified in `templated_args` are instead written to this file,
	which is then passed as an argument to the program. Arguments prefixed with `--node_options=` are
	passed directly to node and not included in the params file.
	""",
	),
	"_bash_runfile_helpers": attr.label(default = Label("@bazel_tools//tools/bash/runfiles")),
	"_launcher_template": attr.label(
	default = Label("//internal/node:node_launcher.sh"),
	allow_single_file = True,
	),
	"_link_modules_script": attr.label(
	default = Label("//internal/linker:index.js"),
	allow_single_file = True,
	),
	"_loader_template": attr.label(
	default = Label("//internal/node:node_loader.js"),
	allow_single_file = True,
	),
	"_repository_args": attr.label(
	default = Label("@nodejs//:bin/node_repo_args.sh"),
	allow_single_file = True,
	),
	"_source_map_support_files": attr.label_list(
	default = [
	Label("//third_party/github.com/buffer-from:contents"),
	Label("//third_party/github.com/source-map:contents"),
	Label("//third_party/github.com/source-map-support:contents"),
	],
	allow_files = True,
	),
	}

	_NODEJS_EXECUTABLE_OUTPUTS = {
	"loader": "%{name}_loader.js",
	"script": "%{name}.sh",
	}

	# The name of the declared rule appears in
	# bazel query --output=label_kind
	# So we make these match what the user types in their BUILD file
	# and duplicate the definitions to give two distinct symbols.
	nodejs_binary = rule(
	implementation = _nodejs_binary_impl,
	attrs = _NODEJS_EXECUTABLE_ATTRS,
	doc = "Runs some JavaScript code in NodeJS.",
	executable = True,
	outputs = _NODEJS_EXECUTABLE_OUTPUTS,
	toolchains = [
	"@build_bazel_rules_nodejs//toolchains/node:toolchain_type",
	"@bazel_tools//tools/sh:toolchain_type",
	],
	)

	nodejs_test = rule(
	implementation = _nodejs_binary_impl,
	attrs = dict(_NODEJS_EXECUTABLE_ATTRS, **{
	"expected_exit_code": attr.int(
	doc = "The expected exit code for the test. Defaults to 0.",
	default = 0,
	),
	}),
	doc = """
	Identical to `nodejs_binary`, except this can be used with `bazel test` as well.
	When the binary returns zero exit code, the test passes; otherwise it fails.

	`nodejs_test` is a convenient way to write a novel kind of test based on running
	your own test runner. For example, the `ts-api-guardian` library has a way to
	assert the public API of a TypeScript program, and uses `nodejs_test` here:
	https://github.com/angular/angular/blob/master/tools/ts-api-guardian/index.bzl

	If you just want to run a standard test using a test runner like Karma or Jasmine,
	use the specific rules for those test runners, e.g. `jasmine_node_test`.

	To debug a Node.js test, we recommend saving a group of flags together in a "config".
	Put this in your `tools/bazel.rc` so it's shared with your team:
	```
	# Enable debugging tests with --config=debug
	test:debug --test_arg=--node_options=--inspect-brk --test_output=streamed --test_strategy=exclusive --test_timeout=9999 --nocache_test_results
	```

	Now you can add `--config=debug` to any `bazel test` command line.
	The runtime will pause before executing the program, allowing you to connect a
	remote debugger.
	""",
	test = True,
	outputs = _NODEJS_EXECUTABLE_OUTPUTS,
	toolchains = [
	"@build_bazel_rules_nodejs//toolchains/node:toolchain_type",
	"@bazel_tools//tools/sh:toolchain_type",
	],
	)