fix(check): should not panic when all specified files excluded (#21929)

Closes #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)