fix(check): should not panic when all specified files excluded (denol…

…and#21929)

Closes denoland#21926

cli/module_loader.rs

@@ -50,6 +50,7 @@ use deno_graph::JsonModule;
 use deno_graph::Module;
 use deno_graph::Resolution;
 use deno_lockfile::Lockfile;
+use deno_runtime::colors;
 use deno_runtime::deno_fs;
 use deno_runtime::deno_node::NodeResolution;
 use deno_runtime::deno_node::NodeResolutionMode;
@@ -227,6 +228,11 @@ impl ModuleLoadPreparer {
  let lib = self.options.ts_type_lib_window();
 
  let specifiers = self.collect_specifiers(files)?;
+
+ if specifiers.is_empty() {
+ log::warn!("{} No matching files found.", colors::yellow("Warning"));
+ }
+
  self
  .prepare_module_load(
  specifiers,

cli/tests/integration/check_tests.rs

@@ -161,6 +161,12 @@ itest!(check_imported_files_listed_in_exclude_option {
  exit_code: 1,
 });
 
+itest!(check_with_excluded_file_specified {
+ args: "check lib/types.d.ts",
+ cwd: Some("check/excluded_file_specified/"),
+ output: "check/excluded_file_specified/check.out",
+});
+
 #[test]
 fn cache_switching_config_then_no_config() {
  let context = TestContext::default();

cli/tests/testdata/check/excluded_file_specified/check.out

@@ -0,0 +1 @@
+Warning No matching files found.

cli/tests/testdata/check/excluded_file_specified/deno.json

@@ -0,0 +1,6 @@
+{
+ "compilerOptions": {
+ "types": ["./lib/types.d.ts"]
+ },
+ "exclude": ["lib"]
+}

cli/tests/testdata/check/excluded_file_specified/lib/types.d.ts

@@ -0,0 +1,2 @@
+// deno-lint-ignore-file
+declare var test: number;

cli/tools/check.rs

@@ -87,6 +87,10 @@ impl TypeChecker {
  graph: Arc<ModuleGraph>,
  options: CheckOptions,
  ) -> Result<Diagnostics, AnyError> {
+ if graph.roots.is_empty() {
+ return Ok(Default::default());
+ }
+
  // node built-in specifiers use the @types/node package to determine
  // types, so inject that now (the caller should do this after the lockfile
  // has been written)