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"""
Rules for building typescript flatbuffers with Bazel.
"""
load("@aspect_rules_js//js:defs.bzl", "js_library")
load(":build_defs.bzl", "flatbuffer_library_public")
DEFAULT_FLATC_TS_ARGS = [
"--gen-object-api",
"--gen-mutable",
"--reflect-names",
"--gen-name-strings",
"--ts-flat-files",
"--keep-prefix",
]
def flatbuffer_ts_library(
name,
srcs,
compatible_with = None,
target_compatible_with = None,
deps = [],
include_paths = None,
flatc_args = DEFAULT_FLATC_TS_ARGS,
visibility = None,
restricted_to = None,
gen_reflections = False):
"""Generates a ts_library rule for a given flatbuffer definition.
Args:
name: Name of the generated ts_library rule.
srcs: Source .fbs file(s).
deps: Other flatbuffer_ts_library's to depend on. Note that currently
you must specify all your transitive dependencies manually.
include_paths: Optional, list of paths the includes files can be found in.
flatc_args: Optional list of additional arguments to pass to flatc
(e.g. --gen-mutable).
visibility: The visibility of the generated cc_library. By default, use the
default visibility of the project.
compatible_with: Optional, The list of environments this rule can be built
for, in addition to default-supported environments.
restricted_to: Optional, The list of environments this rule can be built
for, instead of default-supported environments.
target_compatible_with: Optional, The list of target platform constraints
to use.
gen_reflections: Optional, if true this will generate the flatbuffer
reflection binaries for the schemas.
"""
srcs_lib = "%s_srcs" % (name)
out_base = [native.package_relative_label(s).name.removesuffix(".fbs") for s in srcs]
if len(srcs) != 1:
fail("flatbuffer_ts_library only supports one .fbs file per target currently.")
outs = ["%s_generated.cjs" % s for s in out_base]
includes = [d + "_includes" for d in deps]
reflection_name = "%s_reflection" % name if gen_reflections else ""
flatbuffer_library_public(
name = srcs_lib,
srcs = srcs,
outs = outs,
language_flag = "--ts",
includes = includes,
include_paths = include_paths,
extra_env = "ESBUILD_BIN=$(ESBUILD_BIN)",
flatc_args = flatc_args + ["--filename-suffix _generated"],
compatible_with = compatible_with,
restricted_to = restricted_to,
reflection_name = reflection_name,
reflection_visibility = visibility,
target_compatible_with = target_compatible_with,
flatc_path = Label("//ts:compile_flat_file"),
toolchains = ["@aspect_rules_esbuild//esbuild:resolved_toolchain"],
tools = ["@aspect_rules_esbuild//esbuild:resolved_toolchain"],
)
js_library(
name = name,
visibility = visibility,
compatible_with = compatible_with,
restricted_to = restricted_to,
target_compatible_with = target_compatible_with,
srcs = outs,
)
native.filegroup(
name = "%s_includes" % (name),
srcs = srcs + includes,
compatible_with = compatible_with,
restricted_to = restricted_to,
visibility = visibility,
)