ts_project with transpiler attribute fails with "target is configured to produce no outputs"

[bazaglia]

🐞 bug report

Affected Rule

ts_project

Description

I'm trying to add the recently implemented transpiler attribute to the ts_project. I'm adding the attribute to an existing target that already works and looks like the following:

ts_project(
    name = "compile_ts",
    srcs = glob(["src/**/*.ts"]),
    out_dir = "build",
    root_dir = "src",
    deps = [
        ...
    ],
)

But when I add the transpiler attribute transpiler = swc, I get the following error:

fail("""ts_project target "//{}:{}" is configured to produce no outputs.

By just removing transpiler it builds again.

🔬 Minimal Reproduction

My WORKSPACE has the relevant rules and the npm package @bazel/typescript has been updated to the version 4.6.0

http_archive(
    name = "build_bazel_rules_nodejs",
    sha256 = "ddb78717b802f8dd5d4c01c340ecdc007c8ced5c1df7db421d0df3d642ea0580",
    urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/4.6.0/rules_nodejs-4.6.0.tar.gz"],
)

http_archive(
    name = "aspect_rules_swc",
    sha256 = "b58c8f3681215af30842bc3eeec30c9d2047cdf63302bba7d2e86c55a5c77edf",
    strip_prefix = "rules_swc-0.3.1",
    url = "https://github.com/aspect-build/rules_swc/archive/v0.3.1.tar.gz",
)

load("@aspect_rules_swc//swc:dependencies.bzl", "rules_swc_dependencies")

rules_swc_dependencies()

load("@aspect_rules_swc//swc:repositories.bzl", "swc_register_toolchains")

swc_register_toolchains(
    name = "swc",
    swc_version = "v1.2.118",
)

load("@rules_nodejs//nodejs:repositories.bzl", "nodejs_register_toolchains")

nodejs_register_toolchains(
    name = "node16",
    node_version = "16.13.1",
)

🔥 Exception or Error

File "/private/var/tmp/.../external/npm/@bazel/typescript/internal/ts_project.bzl", line 851, column 13, in ts_project_macro
		fail("""ts_project target "//{}:{}" is configured to produce no outputs.
Error in fail: ts_project target "//my-target:compile_ts" is configured to produce no outputs.

Note that ts_project must know the srcs in advance in order to predeclare the outputs.

🌍 Your Environment

Operating System:

  
macOS 12.0.1
  

Output of bazel version:

  
Build label: 4.2.2-homebrew
Build target: bazel-out/darwin-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Tue Jan 1 00:00:00 1980 (315532800)
Build timestamp: 315532800
Build timestamp as int: 315532800
  

Rules_nodejs version:

  
4.6.0
  

[alexeagle]

Yes, the tsconfig needs to have declarations = true.

I'll add more info to the error message

[alexeagle]

Fixed error messaging in 5.0. We could backport the fix to a 4.x release but it doesn't seem critical to me.