feat: add ts_project(deps) validation ensuring all deps of declarations

Fix #30

ts/defs.bzl

@@ -200,7 +200,7 @@ def ts_project(
 
             Read more: https://blog.aspect.dev/typescript-speedup
 
-        validate: Whether to check that the tsconfig JSON settings match the attributes on this target.
+        validate: Whether to check that the dependencies are valid and the tsconfig JSON settings match the attributes on this target.
             Set this to `False` to skip running our validator, in case you have a legitimate reason for these to differ,
             e.g. you have a setting enabled just for the editor but you want different behavior when Bazel runs `tsc`.
 
@@ -342,6 +342,7 @@ def ts_project(
             allow_js = allow_js,
             tsconfig = tsconfig,
             extends = extends,
+            deps = deps,
             validator = validator,
             **common_kwargs
         )

ts/private/ts_validate_options.bzl

@@ -3,6 +3,7 @@
 load(":ts_config.bzl", "TsConfigInfo")
 load(":ts_lib.bzl", "COMPILER_OPTION_ATTRS", "ValidOptionsInfo")
 load("@aspect_bazel_lib//lib:copy_to_bin.bzl", "copy_files_to_bin_actions")
+load("@aspect_rules_js//js:providers.bzl", "JsInfo")
 
 def _tsconfig_inputs(ctx):
     """Returns all transitively referenced tsconfig files from "tsconfig" and "extends" attributes."""
@@ -23,6 +24,13 @@ def _validate_options_impl(ctx):
     # We make it a .d.ts file so we can plumb it to the deps of the ts_project compile.
     marker = ctx.actions.declare_file("%s.optionsvalid.d.ts" % ctx.label.name)
 
+    # Provider validation
+    if not ctx.attr.allow_js:
+        for d in ctx.attr.deps:
+            if not d[JsInfo].declarations:
+                fail("ts_project '%s' does not contain any declarations" % d)
+
+    # External validation
     arguments = ctx.actions.args()
     config = struct(
         allow_js = ctx.attr.allow_js,
@@ -56,6 +64,7 @@ def _validate_options_impl(ctx):
     ]
 
 _ATTRS = dict(COMPILER_OPTION_ATTRS, **{
+    "deps": attr.label_list(mandatory = True, providers = [JsInfo]),
     "target": attr.string(),
     "ts_build_info_file": attr.string(),
     "tsconfig": attr.label(mandatory = True, allow_single_file = [".json"]),