feat(typescript): add data attribute

Adds the `data` attribute to `ts_project()`. This functions like most `data` attributes as defined by [common Bazel definitions](https://docs.bazel.build/versions/master/be/common-definitions.html#typical-attributes). All it really does is add the provided files to the `DefaultInfo()` runfiles object, where they will be propagated to any consuming rules.

packages/typescript/internal/ts_project.bzl

@@ -23,6 +23,7 @@ _DEFAULT_TYPESCRIPT_PACKAGE = (
 
 _ATTRS = {
     "args": attr.string_list(),
+    "data": attr.label_list(default = [], allow_files = True),
     "declaration_dir": attr.string(),
     "deps": attr.label_list(
         providers = [
@@ -223,7 +224,9 @@ def _ts_project_impl(ctx):
         DefaultInfo(
             files = default_outputs_depset,
             runfiles = ctx.runfiles(
-                transitive_files = default_outputs_depset,
+                transitive_files = depset(ctx.files.data, transitive = [
+                    default_outputs_depset,
+                ]),
                 collect_default = True,
             ),
         ),

packages/typescript/test/ts_project/data/BUILD.bazel

@@ -0,0 +1,22 @@
+load("//packages/jasmine:index.bzl", "jasmine_node_test")
+load("//packages/typescript:index.bzl", "ts_project")
+
+ts_project(
+    name = "data",
+    testonly = True,
+    srcs = ["data.spec.ts"],
+    composite = True,
+    # Should be readable at runtime under runfiles directory.
+    data = ["foo.txt"],
+    extends = "//packages/typescript/test/ts_project:tsconfig-base.json",
+    tsconfig = "tsconfig.json",
+    deps = [
+        "@npm//@types/jasmine",
+        "@npm//@types/node",
+    ],
+)
+
+jasmine_node_test(
+    name = "test",
+    srcs = [":data"],
+)

packages/typescript/test/ts_project/data/data.spec.ts

@@ -0,0 +1,13 @@
+import {promises as fs} from 'fs';
+
+const runfiles = require(process.env['BAZEL_NODE_RUNFILES_HELPER']!);
+
+const FOO_PATH =
+    runfiles.resolve('build_bazel_rules_nodejs/packages/typescript/test/ts_project/data/foo.txt');
+
+describe('data', () => {
+  it('makes files available at runtime', async () => {
+    const foo = await fs.readFile(FOO_PATH, {encoding: 'utf8'});
+    expect(foo).toBe('Foo\n');
+  });
+});

packages/typescript/test/ts_project/data/foo.txt

@@ -0,0 +1 @@
+Foo

packages/typescript/test/ts_project/data/tsconfig.json

@@ -0,0 +1,10 @@
+{
+    "extends": "../tsconfig-base.json",
+    "compilerOptions": {
+        "types": ["jasmine", "node"]
+    },
+    "references": [
+        {"path": "./"}
+    ],
+    "include": ["*.spec.ts"]
+}