Wrong language for syntax highlighting

src/main/java/io/jenkins/plugins/prism/SourcePrinter.java

@@ -5,6 +5,7 @@
 import org.jenkins.ui.symbol.Symbol;
 import org.jenkins.ui.symbol.SymbolRequest;
 import org.jenkins.ui.symbol.SymbolRequest.Builder;
+import org.apache.commons.lang3.Strings;
 
 import edu.hm.hafner.util.LookaheadStream;
 import edu.hm.hafner.util.VisibleForTesting;
@@ -29,6 +30,7 @@
     private static final Sanitizer SANITIZER = new Sanitizer();
 
     private static final ColumnMarker COLUMN_MARKER = new ColumnMarker("-n/a-");
+    private static final String QT_LINGUIST_PATTERN = "<!DOCTYPE TS>";
     private static final String LINE_NUMBERS = "line-numbers";
     private static final String MATCH_BRACES = "match-braces";
     private static final String ICON_MD = "icon-md";
@@ -69,7 +71,7 @@
             StringBuilder marked = readBlockUntilLine(stream, end);
             StringBuilder after = readBlockUntilLine(stream, Integer.MAX_VALUE);
 
-            String language = selectLanguageClass(fileName);
+            String language = selectLanguageClass(fileName, before);
             String code = asCode(before, language, LINE_NUMBERS, MATCH_BRACES)
                     + asMarkedCode(marked, marker, language, LINE_NUMBERS, "highlight", MATCH_BRACES)
                     + createInfoPanel(marker)
@@ -150,8 +152,14 @@
     }
 
     @SuppressWarnings({"javancss", "PMD.CyclomaticComplexity"})
-    private String selectLanguageClass(final String fileName) {
-        return switch (StringUtils.substringAfterLast(fileName, ".")) {
+    private String selectLanguageClass(final String fileName, final StringBuilder before) {
+        String extension = StringUtils.substringAfterLast(fileName, ".");
+
+        if ("ts".equals(extension) && Strings.CS.contains(before, QT_LINGUIST_PATTERN)) {
+            return "language-markup";
+        }
+
+        return switch (extension) {
             case "htm", "html", "xml", "xsd" -> "language-markup";
             case "css" -> "language-css";
             case "js" -> "language-javascript";

src/test/java/io/jenkins/plugins/prism/SourcePrinterTest.java

@@ -11,6 +11,8 @@
 import io.jenkins.plugins.prism.Marker.MarkerBuilder;
 import io.jenkins.plugins.util.JenkinsFacade;
 
+import java.util.stream.Stream;
+
 import static org.assertj.core.api.Assertions.*;
 import static org.mockito.ArgumentMatchers.*;
 import static org.mockito.Mockito.*;
@@ -221,6 +223,49 @@ void shouldRenderXmlFiles() {
         assertThat(pre.text()).isEqualToIgnoringWhitespace(expectedFile);
     }
 
+    @Test
+    @org.junitpioneer.jupiter.Issue("JENKINS-64584")
+    void shouldRenderTypeScriptFileAsTypeScript() {
+        Marker issue = new MarkerBuilder().build();
+        SourcePrinter printer = new SourcePrinter();
+
+        Document document = Jsoup.parse(printer.render("sample.ts", Stream.of("const answer: number = 42;"), issue));
+
+        assertThat(document.getElementsByTag("code").first())
+                .isNotNull();
+        assertThat(document.getElementsByTag("code").first().classNames())
+                .contains("language-typescript");
+    }
+
+    @Test
+    @org.junitpioneer.jupiter.Issue("JENKINS-64584")
+    void shouldRenderQtTranslationFileAsMarkup() {
+        Marker issue = new MarkerBuilder().withLineStart(7).build();
+        SourcePrinter printer = new SourcePrinter();
+
+        Document document = Jsoup.parse(printer.render("sample.ts", Stream.of(
+                "<?xml version=\"1.0\" encoding=\"utf-8\"?>",
+                "<!DOCTYPE TS>",
+                "<TS version=\"2.1\" language=\"en_US\">",
+                "  <context>",
+                "    <name>MainWindow</name>",
+                "    <message>",
+                "      <source>Hello, world!</source>",
+                "      <translation>Hello, world!</translation>",
+                "    </message>",
+                "    <message>",
+                "      <source>File not found</source>",
+                "      <translation>File not found</translation>",
+                "    </message>",
+                "  </context>",
+                "</TS>"), issue));
+
+        assertThat(document.getElementsByTag("code").first())
+                .isNotNull();
+        assertThat(document.getElementsByTag("code").first().classNames())
+                .contains("language-markup");
+    }
+
     private JenkinsFacade createJenkinsFacade() {
         JenkinsFacade jenkinsFacade = mock(JenkinsFacade.class);
         when(jenkinsFacade.getImagePath(anyString())).thenReturn("/path/to/icon");