test: add case for filegroup of srcs

examples/simple/BUILD.bazel

@@ -1,13 +1,7 @@
-load("@aspect_rules_ts//ts:defs.bzl", "ts_project")
-load("@bazel_skylib//rules:write_file.bzl", "write_file")
+"""Simplest example of using ts_project to transpile and type-check a file"""
 
-# Dependencies for all targets in this package
-_DEPS = [
-    "//examples:node_modules/@myorg/js_lib",
-    "//examples:node_modules/@myorg/dts_lib",
-    "//examples:node_modules/@types/node",
-    "//examples:node_modules/date-fns",
-]
+load("@aspect_bazel_lib//lib:testing.bzl", "assert_contains")
+load("@aspect_rules_ts//ts:defs.bzl", "ts_project")
 
 # Type-checks, and emits output to
 # bazel-bin/examples/simple/foo.js
@@ -21,33 +15,28 @@ ts_project(
     out_dir = ".",
     # Note, the tsconfig attribute defaults to the tsconfig.json file in this directory.
     # tsconfig = "<default>",
-    deps = _DEPS,
+    deps = [
+        # Two dependencies are linked from first-party code in this repo
+        # by the npm_link_package calls in /examples/BUILD.bazel
+        "//examples:node_modules/@myorg/js_lib",
+        "//examples:node_modules/@myorg/dts_lib",
+        # Two dependencies are linked from third-party npm packages
+        # by the npm_link_all_packages call in /examples/BUILD.bazel
+        "//examples:node_modules/@types/node",
+        "//examples:node_modules/date-fns",
+    ],
 )
 
-# Code generation tools can produce .ts outputs.
-# This example just writes one directly to bazel-bin.
-write_file(
-    name = "code_generation",
-    out = "generated.ts",
-    content = [
-        "export const data: string[] = []",
-    ],
+# Assert that the output looks like what we expected.
+# Demonstrates that we can refer directly to "foo.js" as a pre-declared output.
+assert_contains(
+    name = "test_js",
+    actual = "foo.js",
+    expected = """var js_lib_1 = require("@myorg/js_lib")""",
 )
 
-# Writes output to bazel-bin/examples/simple/build/foo.js
-ts_project(
-    name = "outdir",
-    # Demonstrates that you can mix sources with generated files
-    srcs = [
-        "foo.ts",
-        "generated.ts",
-    ],
-    extends = "tsconfig.json",
-    # A tsconfig.json file will be generated with this content
-    tsconfig = {
-        "compilerOptions": {
-            "outDir": "build",
-        },
-    },
-    deps = _DEPS,
+assert_contains(
+    name = "test_dts",
+    actual = "foo.d.ts",
+    expected = "export declare const b: string",
 )

examples/srcs/BUILD.bazel

@@ -0,0 +1,82 @@
+"""Shows different ways to pass source files into ts_project"""
+
+load("@aspect_bazel_lib//lib:params_file.bzl", "params_file")
+load("@aspect_bazel_lib//lib:testing.bzl", "assert_contains")
+load("@aspect_rules_ts//ts:defs.bzl", "ts_project")
+load("@bazel_skylib//rules:write_file.bzl", "write_file")
+
+# By default, the macro collects all .ts files in this directory.
+# See the docs on srcs for exactly which files are included.
+ts_project(
+    name = "srcs-auto",
+    out_dir = "auto",
+)
+
+# The sources can come from the default output of some other target.
+# In this case, the ts_project macro won't be able to enumerate individual files
+# so it cannot pre-declare the corresponding .js outputs.
+filegroup(
+    name = "srcs",
+    srcs = glob(["*.ts"]),
+)
+
+ts_project(
+    name = "srcs-filegroup",
+    srcs = [":srcs"],
+    out_dir = "filegroup",
+)
+
+# Tools can also generate .ts source files, so the sources are actually in the bazel-out tree.
+# This example just writes one directly but this could instead be some tool.
+write_file(
+    name = "code_generation",
+    out = "generated.ts",
+    content = [
+        "export const data: string[] = []",
+    ],
+)
+
+# Writes output to bazel-bin/examples/simple/build/foo.js
+ts_project(
+    name = "srcs-generated",
+    # Demonstrates that you can mix sources with generated files
+    srcs = [
+        "a.ts",
+        "generated.ts",
+    ],
+    out_dir = "generated",
+)
+
+# Testing what outputs are actually produced
+[
+    params_file(
+        name = "srcs-{}_mf".format(case),
+        out = "srcs-{}.mf".format(case),
+        args = ["$(rootpaths :srcs-{})".format(case)],
+        data = [":srcs-" + case],
+    )
+    for case in [
+        "auto",
+        "filegroup",
+        "generated",
+    ]
+]
+
+[
+    assert_contains(
+        name = "test_" + case,
+        actual = "srcs-{}.mf".format(case),
+        expected = "examples/srcs/{}/a.js".format(case),
+    )
+    for case in [
+        "auto",
+        "filegroup",
+        "generated",
+    ]
+]
+
+assert_contains(
+    name = "test_gen",
+    actual = "generated/generated.js",
+    expected = "exports.data = []",
+)

examples/srcs/a.ts

@@ -0,0 +1 @@
+export const a: string = 'a'

examples/srcs/b.ts

@@ -0,0 +1 @@
+export const b: string = 'b'

examples/srcs/tsconfig.json

@@ -0,0 +1 @@
+{}