chore: restructure bazel macros

hack/bazel/js/BUILD.bazel

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+package(default_visibility = ["//visibility:public"])

hack/bazel/js/jest.bzl

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+# Copied from https://github.com/bazelbuild/rules_nodejs/blob/stable/examples/jest/jest.bzl
+# Licensed under Apache-2.0, modifications made:
+# - improved dependency resolution
+
+load("@npm//jest-cli:index.bzl", "jest", _jest_test = "jest_test")
+load("//hack/bazel:utils.bzl", "render_deps")
+
+DEFAULT_DEPS = [
+    "@npm//ts-jest",
+    "@npm//enzyme",
+    "@npm//enzyme-adapter-react-16",
+    "@npm//@types/enzyme",
+    "@npm//jest-environment-enzyme",
+    "@npm//jsdom",
+    "@npm//jest",
+    "@npm//jest-enzyme",
+    "@npm//jest-styled-components",
+    "@npm//enzyme-to-json",
+    "@npm//react-dom",
+    "@npm//@types/react-dom",
+    "//:tsconfig.json",
+]
+
+def _impl_jest_test(name, srcs, deps, jest_config, **kwargs):
+    "A macro around the autogenerated jest_test rule"
+    templated_args = [
+        "--no-cache",
+        "--no-watchman",
+        "--ci",
+        "--no-colors",
+    ]
+    templated_args.extend(["--config", "$(rootpath %s)" % jest_config])
+    for src in srcs:
+        templated_args.extend(["--runTestsByPath", "$(rootpath %s)" % src])
+
+    data = [jest_config] + srcs + deps + ["//:jest-reporter.js"]
+    _jest_test(
+        name = name,
+        data = data,
+        templated_args = templated_args,
+        **kwargs
+    )
+
+    # This rule is used specifically to update snapshots via `bazel run`
+    jest(
+        name = "%s.update" % name,
+        data = data,
+        templated_args = templated_args + ["-u"],
+        **kwargs
+    )
+
+def jest_test(src, deps = []):
+    _impl_jest_test(
+        name = src[1:] + "_test",
+        srcs = native.glob(["*.spec.ts", "*.spec.tsx"]),
+        deps = [src] + render_deps(deps) + DEFAULT_DEPS,
+        jest_config = "//:jest.config.js",
+    )

hack/bazel/js/proto.bzl

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+load("//src/ts-protoc-gen/rules:index.bzl", "typescript_proto_library")
+load("@npm//@bazel/typescript:index.bzl", "ts_library")
+
+def _generalize_pb_imports(name, srcs = [], grpc = False):
+    suffix_match = "pb"
+    if grpc:
+        suffix_match = ""
+    native.genrule(
+        name = name,
+        srcs = srcs,
+        outs = ["index.ts"],
+        cmd = """
+           echo $(SRCS) | tr ' ' '\n' | grep '""" + suffix_match + """\\.js$$' | xargs -l1 -I '{}' basename {} .js | xargs -l1 -I'{}' echo 'export * from "./{}"' > $(location index.ts)
+        """,
+        output_to_bindir = True,
+    )
+
+def ts_proto(proto, name = "ts", grpc = False):
+    typescript_proto_library(
+        name = name + "_proto",
+        proto = proto,
+        visibility = ["//visibility:public"],
+    )
+
+    _generalize_pb_imports(
+        grpc = grpc,
+        name = name + "_proto_generalized",
+        srcs = [":" + name + "_proto"],
+    )
+
+    ts_library(
+        name = name,
+        srcs = [":" + name + "_proto_generalized"],
+        deps = [":" + name + "_proto"],
+        visibility = ["//visibility:public"],
+    )

hack/bazel/js/react.bzl

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+load("@npm//@bazel/typescript:index.bzl", "ts_library")
+load("//hack/bazel:utils.bzl", "render_deps")
+
+def react_library(name, deps = [], **kwargs):
+    ts_library(
+        name = name,
+        srcs = native.glob(
+            [
+                "*.ts",
+                "*.tsx",
+            ],
+            exclude = native.glob([
+                "*.spec.ts*",
+                "*.story.tsx",
+                "*.stories.tsx",
+            ]),
+        ),
+        deps = render_deps(deps),
+        **kwargs
+    )