refactor(gazelle): improve js parse-error message (#2343)

GitOrigin-RevId: 72e57e397e370ffeb5b4f8de4dc002d604daf782

gazelle/js/generate.go

@@ -221,10 +221,11 @@ func (ts *TypeScript) addProjectRule(cfg *JsGazelleConfig, args language.Generat
 
 	for result := range ts.collectAllImports(cfg, args, sourceFiles) {
 		if len(result.Errors) > 0 {
-			fmt.Println(result.SourcePath, "parse error(s):")
+			fmt.Printf("%s:\n", result.SourcePath)
 			for _, err := range result.Errors {
-				fmt.Println(err)
+				fmt.Printf("\t%s\n", err)
 			}
+			fmt.Println()
 		}
 
 		for _, sourceImport := range result.Imports {

gazelle/js/tests/parse_errors/expectedStdout.txt

@@ -1,6 +1,9 @@
-subbuild/subbuild-bad.ts parse error(s):
-4: Expected ";" but found "1"
-subdir/subdir-bad.ts parse error(s):
-3: Expected "}" but found "SyntaxError"
-bad.ts parse error(s):
-2: Expected ";" but found "like"
+subbuild/subbuild-bad.ts:
+	4: Expected ";" but found "1"
+
+subdir/subdir-bad.ts:
+	3: Expected "}" but found "SyntaxError"
+
+bad.ts:
+	2: Expected ";" but found "like"
+