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angular-docs-cn/tools/ng_rollup_bundle/ng_rollup_bundle.bzl

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# Copyright Google Inc. All Rights Reserved.
#
# Use of this source code is governed by an MIT-style license that can be
# found in the LICENSE file at https://angular.io/license
"""Rollup with Build Optimizer
This provides a variant of the [rollup_bundle] rule that works better for Angular apps.
It registers `@angular-devkit/build-optimizer` as a rollup plugin, to get
better optimization. It also uses ESM5 format inputs, as this is what
build-optimizer is hard-coded to look for and transform.
[rollup_bundle]: https://bazelbuild.github.io/rules_nodejs/rollup/rollup_bundle.html
"""
load("@build_bazel_rules_nodejs//:index.bzl", "npm_package_bin")
load("@build_bazel_rules_nodejs//:providers.bzl", "JSEcmaScriptModuleInfo", "NpmPackageInfo", "node_modules_aspect")
load("//packages/bazel/src:esm5.bzl", "esm5_outputs_aspect", "esm5_root_dir", "flatten_esm5")
load("@npm_bazel_terser//:index.bzl", "terser_minified")
_NG_ROLLUP_BUNDLE_OUTPUTS = {
"bundle": "%{name}.js",
"sourcemap": "%{name}.js.map",
}
_NG_ROLLUP_MODULE_MAPPINGS_ATTR = "ng_rollup_module_mappings"
def _ng_rollup_module_mappings_aspect_impl(target, ctx):
mappings = dict()
for dep in ctx.rule.attr.deps:
if hasattr(dep, _NG_ROLLUP_MODULE_MAPPINGS_ATTR):
for k, v in getattr(dep, _NG_ROLLUP_MODULE_MAPPINGS_ATTR).items():
if k in mappings and mappings[k] != v:
fail(("duplicate module mapping at %s: %s maps to both %s and %s" %
(target.label, k, mappings[k], v)), "deps")
mappings[k] = v
if ((hasattr(ctx.rule.attr, "module_name") and ctx.rule.attr.module_name) or
(hasattr(ctx.rule.attr, "module_root") and ctx.rule.attr.module_root)):
mn = ctx.rule.attr.module_name
if not mn:
mn = target.label.name
mr = target.label.package
if target.label.workspace_root:
mr = "%s/%s" % (target.label.workspace_root, mr)
if ctx.rule.attr.module_root and ctx.rule.attr.module_root != ".":
if ctx.rule.attr.module_root.endswith(".ts"):
# This is the type-checking module mapping. Strip the trailing .d.ts
# as it doesn't belong in TypeScript's path mapping.
mr = "%s/%s" % (mr, ctx.rule.attr.module_root.replace(".d.ts", ""))
else:
mr = "%s/%s" % (mr, ctx.rule.attr.module_root)
if mn in mappings and mappings[mn] != mr:
fail(("duplicate module mapping at %s: %s maps to both %s and %s" %
(target.label, mn, mappings[mn], mr)), "deps")
mappings[mn] = mr
return struct(ng_rollup_module_mappings = mappings)
ng_rollup_module_mappings_aspect = aspect(
_ng_rollup_module_mappings_aspect_impl,
attr_aspects = ["deps"],
)
_NG_ROLLUP_BUNDLE_DEPS_ASPECTS = [esm5_outputs_aspect, ng_rollup_module_mappings_aspect, node_modules_aspect]
_NG_ROLLUP_BUNDLE_ATTRS = {
"build_optimizer": attr.bool(
doc = """Use build optimizer plugin
Only used if sources are esm5 which depends on value of esm5_sources.""",
default = True,
),
"esm5_sources": attr.bool(
doc = """Use esm5 input sources""",
default = True,
),
"srcs": attr.label_list(
doc = """JavaScript source files from the workspace.
These can use ES2015 syntax and ES Modules (import/export)""",
allow_files = True,
),
"entry_point": attr.label(
doc = """The starting point of the application, passed as the `--input` flag to rollup.
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:
```
ng_rollup_bundle(
name = "bundle",
entry_point = ":main.js",
)
```
You can specify the entry point as a typescript file so long as you also include
the ts_library target in deps:
```
ts_library(
name = "main",
srcs = ["main.ts"],
)
ng_rollup_bundle(
name = "bundle",
deps = [":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"],
)
ng_rollup_bundle(
name = "bundle",
entry_point = ":entry_file",
)
```
""",
mandatory = True,
allow_single_file = True,
),
"deps": attr.label_list(
doc = """Other targets that provide JavaScript files.
Typically this will be `ts_library` or `ng_module` targets.""",
aspects = _NG_ROLLUP_BUNDLE_DEPS_ASPECTS,
),
"format": attr.string(
doc = """"Specifies the format of the generated bundle. One of the following:
- `amd`: Asynchronous Module Definition, used with module loaders like RequireJS
- `cjs`: CommonJS, suitable for Node and other bundlers
- `esm`: Keep the bundle as an ES module file, suitable for other bundlers and inclusion as a `<script type=module>` tag in modern browsers
- `iife`: A self-executing function, suitable for inclusion as a `<script>` tag. (If you want to create a bundle for your application, you probably want to use this.)
- `umd`: Universal Module Definition, works as amd, cjs and iife all in one
- `system`: Native format of the SystemJS loader
""",
values = ["amd", "cjs", "esm", "iife", "umd", "system"],
default = "esm",
),
"global_name": attr.string(
doc = """A name given to this package when referenced as a global variable.
This name appears in the bundle module incantation at the beginning of the file,
and governs the global symbol added to the global context (e.g. `window`) as a side-
effect of loading the UMD/IIFE JS bundle.
Rollup doc: "The variable name, representing your iife/umd bundle, by which other scripts on the same page can access it."
This is passed to the `output.name` setting in Rollup.""",
),
"globals": attr.string_dict(
doc = """A dict of symbols that reference external scripts.
The keys are variable names that appear in the program,
and the values are the symbol to reference at runtime in a global context (UMD bundles).
For example, a program referencing @angular/core should use ng.core
as the global reference, so Angular users should include the mapping
`"@angular/core":"ng.core"` in the globals.""",
default = {},
),
"license_banner": attr.label(
doc = """A .txt file passed to the `banner` config option of rollup.
The contents of the file will be copied to the top of the resulting bundles.
Note that you can replace a version placeholder in the license file, by using
the special version `0.0.0-PLACEHOLDER`. See the section on stamping in the README.""",
allow_single_file = [".txt"],
),
"_rollup": attr.label(
executable = True,
cfg = "host",
default = Label("//tools/ng_rollup_bundle:rollup_with_build_optimizer"),
),
"_rollup_config_tmpl": attr.label(
default = Label("//tools/ng_rollup_bundle:rollup.config.js"),
allow_single_file = True,
),
}
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
for d in ctx.attr.deps:
if NpmPackageInfo in d:
possible_root = "/".join(["external", d[NpmPackageInfo].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 but we still need a node_modules_root even if its empty
node_modules_root = "external/npm/node_modules"
return node_modules_root
# 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
# Expand entry_point into runfiles and strip the file extension
def _esm5_entry_point_path(ctx):
return _to_manifest_path(ctx, ctx.file.entry_point)[:-(len(ctx.file.entry_point.extension) + 1)]
def _no_ext(f):
return f.short_path[:-len(f.extension) - 1]
def _resolve_js_input(f, inputs):
if f.extension == "js" or f.extension == "mjs":
return f
# look for corresponding js file in inputs
no_ext = _no_ext(f)
for i in inputs:
if i.extension == "js" or i.extension == "mjs":
if _no_ext(i) == no_ext:
return i
fail("Could not find corresponding javascript entry point for %s. Add the %s.js to your deps." % (f.path, no_ext))
def _write_rollup_config(ctx, root_dir, build_optimizer, filename = "_%s.rollup.conf.js"):
"""Generate a rollup config file.
Args:
ctx: Bazel rule execution context
root_dir: root directory for module resolution
build_optimizer: whether to enable Build Optimizer plugin
filename: output filename pattern (defaults to `_%s.rollup.conf.js`)
Returns:
The rollup config file. See https://rollupjs.org/guide/en#configuration-files
"""
config = ctx.actions.declare_file(filename % ctx.label.name)
mappings = dict()
all_deps = ctx.attr.deps + ctx.attr.srcs
for dep in all_deps:
if hasattr(dep, _NG_ROLLUP_MODULE_MAPPINGS_ATTR):
for k, v in getattr(dep, _NG_ROLLUP_MODULE_MAPPINGS_ATTR).items():
if k in mappings and mappings[k] != v:
fail(("duplicate module mapping at %s: %s maps to both %s and %s" %
(dep.label, k, mappings[k], v)), "deps")
mappings[k] = v
globals = {}
external = []
if ctx.attr.globals:
globals = ctx.attr.globals.items()
external = ctx.attr.globals.keys()
ctx.actions.expand_template(
output = config,
template = ctx.file._rollup_config_tmpl,
substitutions = {
"TMPL_banner_file": "\"%s\"" % ctx.file.license_banner.path if ctx.file.license_banner else "undefined",
"TMPL_build_optimizer": "true" if build_optimizer else "false",
"TMPL_module_mappings": str(mappings),
"TMPL_node_modules_root": _compute_node_modules_root(ctx),
"TMPL_root_dir": root_dir,
"TMPL_stamp_data": "\"%s\"" % ctx.version_file.path if ctx.version_file else "undefined",
"TMPL_workspace_name": ctx.workspace_name,
"TMPL_external": ", ".join(["'%s'" % e for e in external]),
"TMPL_globals": ", ".join(["'%s': '%s'" % g for g in globals]),
},
)
return config
def _filter_js_inputs(all_inputs):
all_inputs_list = all_inputs.to_list() if type(all_inputs) == type(depset()) else all_inputs
return [
f
for f in all_inputs_list
if f.path.endswith(".js") or f.path.endswith(".mjs") or f.path.endswith(".json")
]
def _run_rollup(ctx, entry_point_path, sources, config):
args = ctx.actions.args()
args.add("--config", config.path)
args.add("--input", entry_point_path)
args.add("--output.file", ctx.outputs.bundle)
args.add("--output.name", ctx.attr.global_name if ctx.attr.global_name else ctx.label.name)
args.add("--output.format", ctx.attr.format)
args.add("--output.sourcemap")
args.add("--output.sourcemapFile", ctx.outputs.sourcemap)
# We will produce errors as needed. Anything else is spammy: a well-behaved
# bazel rule prints nothing on success.
args.add("--silent")
args.add("--preserveSymlinks")
direct_inputs = [config]
# Also include files from npm fine grained deps as inputs.
# These deps are identified by the NpmPackageInfo provider.
for d in ctx.attr.deps:
if NpmPackageInfo in d:
# Note: we can't avoid calling .to_list() on sources
direct_inputs.extend(_filter_js_inputs(d[NpmPackageInfo].sources.to_list()))
if ctx.file.license_banner:
direct_inputs.append(ctx.file.license_banner)
if ctx.version_file:
direct_inputs.append(ctx.version_file)
ctx.actions.run(
progress_message = "Bundling JavaScript %s [rollup]" % ctx.outputs.bundle.short_path,
executable = ctx.executable._rollup,
inputs = depset(direct_inputs, transitive = [sources]),
outputs = [ctx.outputs.bundle, ctx.outputs.sourcemap],
arguments = [args],
)
def _ng_rollup_bundle_impl(ctx):
if ctx.attr.esm5_sources:
# Use esm5 sources and build optimzier if ctx.attr.build_optimizer is set
rollup_config = _write_rollup_config(ctx, build_optimizer = ctx.attr.build_optimizer, root_dir = "/".join([ctx.bin_dir.path, ctx.label.package, esm5_root_dir(ctx)]))
_run_rollup(ctx, _esm5_entry_point_path(ctx), flatten_esm5(ctx), rollup_config)
else:
# Use esm2015 sources and no build optimzier
rollup_config = _write_rollup_config(ctx, build_optimizer = False, root_dir = ctx.bin_dir.path)
esm2015_files_depsets = []
for dep in ctx.attr.deps:
if JSEcmaScriptModuleInfo in dep:
esm2015_files_depsets.append(dep[JSEcmaScriptModuleInfo].sources)
esm2015_files = depset(transitive = esm2015_files_depsets)
entry_point_path = _to_manifest_path(ctx, _resolve_js_input(ctx.file.entry_point, esm2015_files.to_list()))
_run_rollup(ctx, entry_point_path, esm2015_files, rollup_config)
return DefaultInfo(files = depset([ctx.outputs.bundle, ctx.outputs.sourcemap]))
_ng_rollup_bundle = rule(
implementation = _ng_rollup_bundle_impl,
attrs = _NG_ROLLUP_BUNDLE_ATTRS,
outputs = _NG_ROLLUP_BUNDLE_OUTPUTS,
)
"""
Run [Rollup] with the [Build Optimizer] plugin and use esm5 inputs.
[Rollup]: https://rollupjs.org/
[Build Optimizer]: https://www.npmjs.com/package/@angular-devkit/build-optimizer
"""
def ng_rollup_bundle(name, **kwargs):
"""Rollup with Build Optimizer on esm5 inputs.
This provides a variant of the [legacy rollup_bundle] rule that works better for Angular apps.
Runs [rollup], [terser_minified] and [brotli] to produce a number of output bundles.
es5 : "%{name}.js"
es5 minified : "%{name}.min.js"
es5 minified (compressed) : "%{name}.min.js.br",
es5 minified (debug) : "%{name}.min_debug.js"
es2015 : "%{name}.es2015.js"
es2015 minified : "%{name}.min.es2015.js"
es2015 minified (compressed) : "%{name}.min.js.es2015.br",
es2015 minified (debug) : "%{name}.min_debug.es2015.js"
It registers `@angular-devkit/build-optimizer` as a rollup plugin, to get
better optimization. It also uses ESM5 format inputs, as this is what
build-optimizer is hard-coded to look for and transform.
[legacy rollup_bundle]: https://github.com/bazelbuild/rules_nodejs/blob/0.38.3/internal/rollup/rollup_bundle.bzl
[rollup]: https://rollupjs.org/guide/en/
[terser_minified]: https://bazelbuild.github.io/rules_nodejs/Terser.html
[brotli]: https://brotli.org/
"""
format = kwargs.pop("format", "iife")
build_optimizer = kwargs.pop("build_optimizer", True)
visibility = kwargs.pop("visibility", None)
# Common arguments for all terser_minified targets
common_terser_args = {
# As of terser 4.3.4 license comments are preserved by default. See
# https://github.com/terser/terser/blob/master/CHANGELOG.md. We want to
# maintain the comments off behavior. We pass the --comments flag with
# a regex that always evaluates to false to do this.
"args": ["--comments", "/bogus_string_to_suppress_all_comments^/"],
"config_file": "//tools/ng_rollup_bundle:terser_config.json",
"sourcemap": False,
}
# TODO(gregmagolan): reduce this macro to just use the new @bazel/rollup rollup_bundle
# once esm5 inputs are no longer needed. _ng_rollup_bundle is just here for esm5 support
# and once that requirement is removed for Angular 10 then there is nothing that rule is doing
# that the new @bazel/rollup rollup_bundle rule can't do.
_ng_rollup_bundle(
name = name,
build_optimizer = build_optimizer,
format = format,
visibility = visibility,
**kwargs
)
terser_minified(name = name + ".min", src = name, visibility = visibility, **common_terser_args)
native.filegroup(name = name + ".min.js", srcs = [name + ".min"], visibility = visibility)
terser_minified(name = name + ".min_debug", src = name, debug = True, visibility = visibility, **common_terser_args)
native.filegroup(name = name + ".min_debug.js", srcs = [name + ".min_debug"], visibility = visibility)
npm_package_bin(
name = "_%s_brotli" % name,
tool = "//tools/brotli-cli",
data = [name + ".min.js"],
outs = [name + ".min.js.br"],
args = [
"--output=$(location %s.min.js.br)" % name,
"$(location %s.min.js)" % name,
],
visibility = visibility,
)
_ng_rollup_bundle(
name = name + ".es2015",
esm5_sources = False,
format = format,
visibility = visibility,
**kwargs
)
terser_minified(name = name + ".min.es2015", src = name + ".es2015", visibility = visibility, **common_terser_args)
native.filegroup(name = name + ".min.es2015.js", srcs = [name + ".min.es2015"], visibility = visibility)
terser_minified(name = name + ".min_debug.es2015", src = name + ".es2015", debug = True, visibility = visibility, **common_terser_args)
native.filegroup(name = name + ".min_debug.es2015.js", srcs = [name + ".min_debug.es2015"], visibility = visibility)
npm_package_bin(
name = "_%s_es2015_brotli" % name,
tool = "//tools/brotli-cli",
data = [name + ".min.es2015.js"],
outs = [name + ".min.es2015.js.br"],
args = [
"--output=$(location %s.min.es2015.js.br)" % name,
"$(location %s.min.es2015.js)" % name,
],
visibility = visibility,
)
def ls_rollup_bundle(name, **kwargs):
"""A variant of ng_rollup_bundle for the language-service bundle
ls_rollup_bundle uses esm5 inputs, outputs AMD and does not use the build optimizer.
"""
visibility = kwargs.pop("visibility", None)
# Note: the output file is called "umd.js" because of historical reasons.
# The format is actually AMD and not UMD, but we are afraid to rename
# the file because that would likely break the IDE and other integrations that
# have the path hardcoded in them.
ng_rollup_bundle(
name = name + ".umd",
build_optimizer = False,
format = "amd",
visibility = visibility,
**kwargs
)
native.alias(
name = name,
actual = name + ".umd",
visibility = visibility,
)
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