BUILD.bazel

package(default_visibility=["//visibility:public"])
load("@build_bazel_rules_typescript//:defs.bzl", "ts_library")

ts_library(
    name = "my_code",
    srcs = glob(["*.ts"]),
)

filegroup(name = "node_modules", srcs = glob([
    "node_modules/**/*.js",
    "node_modules/**/*.d.ts",
    "node_modules/**/*.json",
]))

my.ts

export const s: string = 's';

package.json

{
    "name": "example",
    "devDependencies": {
        "rules_typescript": "alexeagle/rules_typescript#74a5bb2"
    }
}

WORKSPACE

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")

# First, we bootstrap things by having Bazel download the nodejs rules.
# This depends on getting a resolution to
# https://github.com/pubref/rules_node/issues/19 so we can have a first-party
# bazelbuild/rules_nodejs (otherwise it's strange for first-party
# bazelbuild/rules_typescript to depend on third-party alexeagle/rules_nodejs)
# For now, I have a prototype under alexeagle/rules_nodejs
git_repository(
    name = "build_bazel_rules_nodejs",
    remote = "https://github.com/alexeagle/rules_nodejs.git",
    commit = "4924d7b",
)

load("@build_bazel_rules_nodejs//:defs.bzl", "node_repositories")

node_repositories(package_json = "//:package.json")

# Now, we need both the runtime deps and the .bzl files for rules_typescript.
# Instead of having bazel fetch the rules, as you normally would, we want a
# single dependency that gives both compile-time and runtime dependencies.
# Note that it's okay that this path doesn't exist at first, bazel won't look at
# this until you try to build the first ts_* target. That's actually a nicer
# error message if you haven't installed.
# Users must add to package.json
# "devDependencies": {
#   "rules_typescript": "alexeagle/rules_typescript#rules_nodejs"
# }
local_repository(
  name = "build_bazel_rules_typescript",
  path = "node_modules/rules_typescript",
)