diff --git a/src/main/java/com/probejs/compiler/EventCompiler.java b/src/main/java/com/probejs/compiler/EventCompiler.java
index a822a965..ad70d4c4 100644
--- a/src/main/java/com/probejs/compiler/EventCompiler.java
+++ b/src/main/java/com/probejs/compiler/EventCompiler.java
@@ -95,7 +95,7 @@ private static void writeWildcardEvents(BufferedWriter writer) throws IOExceptio
                 "",
                 "E.g. `player.data_from_server.reload`, `ftbquests.completed.123456`"
             )
-                .format(0, 0)
+                .formatLines(0, 0)
         );
         lines.add(
             "declare function onEvent(name: `${string}.${string}`, handler: (event: Internal.EventJS) => void): void;"
diff --git a/src/main/java/com/probejs/compiler/TypingCompiler.java b/src/main/java/com/probejs/compiler/TypingCompiler.java
index ce698b09..8c6a62d2 100644
--- a/src/main/java/com/probejs/compiler/TypingCompiler.java
+++ b/src/main/java/com/probejs/compiler/TypingCompiler.java
@@ -78,7 +78,7 @@ public static void compileGlobal(Set<Class<?>> globalClasses) throws IOException
 
             NameResolver.ResolvedName name = NameResolver.getResolvedName(clazz.getName());
             if (name.getNamespace().isEmpty()) {
-                for (String line : formatter.format(0, 4)) {
+                for (String line : formatter.formatLines(0, 4)) {
                     writer.write(line);
                     writer.write("\n");
                 }
@@ -96,7 +96,7 @@ public static void compileGlobal(Set<Class<?>> globalClasses) throws IOException
             val path = entry.getKey();
             val formatters = entry.getValue();
             val namespace = new FormatterNamespace(path, formatters);
-            for (val line : namespace.format(0, 4)) {
+            for (val line : namespace.formatLines(0, 4)) {
                 writer.write(line);
                 writer.write('\n');
             }
@@ -113,17 +113,17 @@ public static void compileGlobal(Set<Class<?>> globalClasses) throws IOException
             "Document",
             DocManager.classAdditions.values().stream().map(l -> l.get(0)).collect(Collectors.toList())
         )
-            .format(0, 4)) {
+            .formatLines(0, 4)) {
             writer.write(line);
             writer.write("\n");
         }
         //namespace::Type
-        for (String line : new FormatterNamespace("Type", DocManager.typeDocuments).format(0, 4)) {
+        for (String line : new FormatterNamespace("Type", DocManager.typeDocuments).formatLines(0, 4)) {
             writer.write(line);
             writer.write("\n");
         }
         //no namespace
-        for (String line : new FormatterRaw(DocManager.rawTSDoc).format(0, 4)) {
+        for (String line : new FormatterRaw(DocManager.rawTSDoc).formatLines(0, 4)) {
             writer.write(line);
             writer.write("\n");
         }
diff --git a/src/main/java/com/probejs/compiler/rich/lang/FormatterLang.java b/src/main/java/com/probejs/compiler/rich/lang/FormatterLang.java
index a896f513..78bd51ea 100644
--- a/src/main/java/com/probejs/compiler/rich/lang/FormatterLang.java
+++ b/src/main/java/com/probejs/compiler/rich/lang/FormatterLang.java
@@ -2,6 +2,7 @@
 
 import com.probejs.ProbeJS;
 import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import java.util.*;
 import java.util.function.Consumer;
@@ -13,7 +14,7 @@
 import net.minecraft.client.resources.language.LanguageManager;
 import net.minecraft.locale.Language;
 
-public class FormatterLang implements IFormatter {
+public class FormatterLang implements MultiFormatter {
 
     public static final LanguageInfo DEFAULT_LANGUAGE = new LanguageInfo("en_us", "US", "English", false);
     private static final Set<String> ALL_KEYS = new HashSet<>();
@@ -33,7 +34,7 @@ public static Set<String> getAllKeys() {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         if (!(Language.getInstance() instanceof ClientLanguage)) {
             return new ArrayList<>(0);
         }
diff --git a/src/main/java/com/probejs/compiler/special/PlatformDataCompiler.java b/src/main/java/com/probejs/compiler/special/PlatformDataCompiler.java
index c98d84ab..e409aead 100644
--- a/src/main/java/com/probejs/compiler/special/PlatformDataCompiler.java
+++ b/src/main/java/com/probejs/compiler/special/PlatformDataCompiler.java
@@ -24,7 +24,7 @@ public static void compile(BufferedWriter writer) throws IOException {
         //more?
 
         for (final String line : new FormatterNamespace("platform", new FormatterRaw(lines, false))
-            .format(0, 4)) {
+            .formatLines(0, 4)) {
             writer.write(line);
             writer.write('\n');
         }
diff --git a/src/main/java/com/probejs/compiler/special/RecipeHoldersCompiler.java b/src/main/java/com/probejs/compiler/special/RecipeHoldersCompiler.java
index ebc3200a..04db04e0 100644
--- a/src/main/java/com/probejs/compiler/special/RecipeHoldersCompiler.java
+++ b/src/main/java/com/probejs/compiler/special/RecipeHoldersCompiler.java
@@ -66,7 +66,7 @@ public static List<String> format(int indent, int stepIndent) {
             namespecedFmtr.add(new FormatterRaw(lines, false));
         }
 
-        return new FormatterNamespace("stub.probejs", namespecedFmtr).format(indent, stepIndent);
+        return new FormatterNamespace("stub.probejs", namespecedFmtr).formatLines(indent, stepIndent);
     }
 
     public static void compile(BufferedWriter writer) throws IOException {
diff --git a/src/main/java/com/probejs/compiler/special/RegistryCompiler.java b/src/main/java/com/probejs/compiler/special/RegistryCompiler.java
index 82d4d673..9c09153e 100644
--- a/src/main/java/com/probejs/compiler/special/RegistryCompiler.java
+++ b/src/main/java/com/probejs/compiler/special/RegistryCompiler.java
@@ -49,7 +49,7 @@ public static void compile(BufferedWriter writer) throws IOException {
             formatters.add(new FormatterNamespace(namespace, new FormatterRaw(lines, false)));
         });
         val namespaced = new FormatterNamespace("Registry", formatters);
-        for (val line : namespaced.format(0, 4)) {
+        for (val line : namespaced.formatLines(0, 4)) {
             writer.write(line);
             writer.write('\n');
         }
diff --git a/src/main/java/com/probejs/compiler/special/TagCompiler.java b/src/main/java/com/probejs/compiler/special/TagCompiler.java
index e01f6772..df94ae0b 100644
--- a/src/main/java/com/probejs/compiler/special/TagCompiler.java
+++ b/src/main/java/com/probejs/compiler/special/TagCompiler.java
@@ -36,7 +36,7 @@ public static List<String> format(int indent, int stepIndent) {
             )
             .collect(Collectors.toList());
         return new FormatterNamespace("Tag", new FormatterRaw(lines, false))
-            .format(indent, stepIndent);
+            .formatLines(indent, stepIndent);
     }
 
     public static void compile(BufferedWriter writer) throws IOException {
diff --git a/src/main/java/com/probejs/document/DocumentClass.java b/src/main/java/com/probejs/document/DocumentClass.java
index c4d698fc..10461a96 100644
--- a/src/main/java/com/probejs/document/DocumentClass.java
+++ b/src/main/java/com/probejs/document/DocumentClass.java
@@ -1,7 +1,7 @@
 package com.probejs.document;
 
 import com.probejs.document.comment.CommentUtil;
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import lombok.Getter;
 import lombok.Setter;
@@ -9,7 +9,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-public class DocumentClass extends DocumentProperty implements IConcrete, IFormatter {
+public class DocumentClass extends DocumentProperty implements IConcrete, MultiFormatter {
 
     @Setter
     @Getter
@@ -48,7 +48,7 @@ public void merge(DocumentClass other) {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> lines = new ArrayList<>();
         StringBuilder firstLine = new StringBuilder(PUtil.indent(indent))
             .append("class ")
@@ -61,8 +61,8 @@ public List<String> format(int indent, int stepIndent) {
             firstLine.append("implements ").append(String.join(", ", this.interfaces)).append(' ');
         }
         lines.add(firstLine.append('{').toString());
-        this.fieldDocs.forEach(f -> lines.addAll(f.format(indent + stepIndent, stepIndent)));
-        this.methodDocs.forEach(m -> lines.addAll(m.format(indent + stepIndent, stepIndent)));
+        this.fieldDocs.forEach(f -> lines.addAll(f.formatLines(indent + stepIndent, stepIndent)));
+        this.methodDocs.forEach(m -> lines.addAll(m.formatLines(indent + stepIndent, stepIndent)));
         lines.add(PUtil.indent(indent) + "}");
         return lines;
     }
diff --git a/src/main/java/com/probejs/document/DocumentComment.java b/src/main/java/com/probejs/document/DocumentComment.java
index 26335230..4aadbe87 100644
--- a/src/main/java/com/probejs/document/DocumentComment.java
+++ b/src/main/java/com/probejs/document/DocumentComment.java
@@ -4,6 +4,7 @@
 import com.probejs.document.comment.CommentHandler;
 import com.probejs.document.comment.CommentUtil;
 import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -11,7 +12,7 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
-public class DocumentComment implements IDecorative, IFormatter {
+public class DocumentComment implements IDecorative, MultiFormatter {
 
     private final List<String> documentText;
     private final HashMap<Class<? extends AbstractComment>, List<AbstractComment>> abstractComments = new HashMap<>();
@@ -59,7 +60,7 @@ public List<String> getDocumentText() {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         return getDocumentText().stream().map(PUtil.indent(indent)::concat).collect(Collectors.toList());
     }
 }
diff --git a/src/main/java/com/probejs/document/DocumentField.java b/src/main/java/com/probejs/document/DocumentField.java
index a7260abd..65c1e97c 100644
--- a/src/main/java/com/probejs/document/DocumentField.java
+++ b/src/main/java/com/probejs/document/DocumentField.java
@@ -3,7 +3,7 @@
 import com.probejs.document.parser.processor.IDocumentProvider;
 import com.probejs.document.type.IDocType;
 import com.probejs.document.type.DocTypeResolver;
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import com.probejs.util.Pair;
 import com.probejs.util.StringUtil;
@@ -12,7 +12,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-public class DocumentField extends DocumentProperty implements IDocumentProvider<DocumentField>, IFormatter {
+public class DocumentField extends DocumentProperty implements IDocumentProvider<DocumentField>, MultiFormatter {
 
     private final boolean isFinal;
     private final boolean isStatic;
@@ -61,10 +61,10 @@ public DocumentField provide() {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> formatted = new ArrayList<>();
         if (comment != null) {
-            formatted.addAll(comment.format(indent, stepIndent));
+            formatted.addAll(comment.formatLines(indent, stepIndent));
         }
         formatted.add(
             String.format(
diff --git a/src/main/java/com/probejs/document/DocumentMethod.java b/src/main/java/com/probejs/document/DocumentMethod.java
index a7dbf864..4700231b 100644
--- a/src/main/java/com/probejs/document/DocumentMethod.java
+++ b/src/main/java/com/probejs/document/DocumentMethod.java
@@ -3,7 +3,7 @@
 import com.probejs.document.parser.processor.IDocumentProvider;
 import com.probejs.document.type.IDocType;
 import com.probejs.document.type.DocTypeResolver;
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.info.clazz.MethodInfo;
 import com.probejs.util.PUtil;
 import com.probejs.util.StringUtil;
@@ -14,7 +14,7 @@
 
 public class DocumentMethod
     extends DocumentProperty
-    implements IDocumentProvider<DocumentMethod>, IFormatter {
+    implements IDocumentProvider<DocumentMethod>, MultiFormatter {
 
     @Override
     public DocumentMethod provide() {
@@ -30,9 +30,9 @@ public String getMethodBody() {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> formatted = new ArrayList<>();
-        if (comment != null) formatted.addAll(comment.format(indent, stepIndent));
+        if (comment != null) formatted.addAll(comment.formatLines(indent, stepIndent));
         String paramStr = getParams()
             .stream()
             .map(documentParam ->
diff --git a/src/main/java/com/probejs/document/DocumentType.java b/src/main/java/com/probejs/document/DocumentType.java
index 32d14e67..a4570366 100644
--- a/src/main/java/com/probejs/document/DocumentType.java
+++ b/src/main/java/com/probejs/document/DocumentType.java
@@ -4,7 +4,7 @@
 import com.probejs.document.parser.processor.IDocumentProvider;
 import com.probejs.document.type.IDocType;
 import com.probejs.document.type.DocTypeResolver;
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import com.probejs.util.Pair;
 import com.probejs.util.StringUtil;
@@ -15,7 +15,7 @@
 import java.util.List;
 
 @Getter
-public class DocumentType implements IDocumentProvider<DocumentType>, IFormatter, IConcrete {
+public class DocumentType implements IDocumentProvider<DocumentType>, MultiFormatter, IConcrete {
 
     //type <name> = <type>;
 
@@ -43,7 +43,7 @@ public DocumentType provide() {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         if (!CommentUtil.isLoaded(comment) || CommentUtil.isHidden(comment)) {
             return new ArrayList<>(0);
         }
diff --git a/src/main/java/com/probejs/formatter/FormatterClass.java b/src/main/java/com/probejs/formatter/FormatterClass.java
index 5335fa77..16d68499 100644
--- a/src/main/java/com/probejs/formatter/FormatterClass.java
+++ b/src/main/java/com/probejs/formatter/FormatterClass.java
@@ -12,7 +12,7 @@
 import com.probejs.document.comment.CommentUtil;
 import com.probejs.document.type.IDocType;
 import com.probejs.formatter.api.DocumentReceiver;
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.formatter.resolver.NameResolver;
 import com.probejs.info.clazz.ClassInfo;
 import com.probejs.info.clazz.FieldInfo;
@@ -27,7 +27,7 @@
 import java.util.*;
 import java.util.stream.Collectors;
 
-public class FormatterClass extends DocumentReceiver<DocumentClass> implements IFormatter {
+public class FormatterClass extends DocumentReceiver<DocumentClass> implements MultiFormatter {
 
     private final ClassInfo classInfo;
     private final Map<String, FormatterField> fieldFormatters;
@@ -78,14 +78,14 @@ public static String formatParameterized(IType info) {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> lines = new ArrayList<>();
         DocumentComment comment = document == null ? null : document.getComment();
         if (comment != null) {
             if (CommentUtil.isHidden(comment)) {
                 return lines;
             }
-            lines.addAll(comment.format(indent, stepIndent));
+            lines.addAll(comment.formatLines(indent, stepIndent));
         }
 
         List<String> assignableTypes = DocManager.typesAssignable
@@ -180,7 +180,7 @@ public List<String> format(int indent, int stepIndent) {
                 //not static interface in namespace `Internal`
                 !(classInfo.isInterface() && fmtrMethod.getInfo().isStatic() && internal)
             )
-            .forEach(fmtrMethod -> lines.addAll(fmtrMethod.format(indent + stepIndent, stepIndent)));
+            .forEach(fmtrMethod -> lines.addAll(fmtrMethod.formatLines(indent + stepIndent, stepIndent)));
         //fields
         fieldFormatters
             .entrySet()
@@ -189,7 +189,7 @@ public List<String> format(int indent, int stepIndent) {
             .filter(f -> !(classInfo.isInterface() && f.getValue().getFieldInfo().isStatic() && internal))
             .forEach(f -> {
                 f.getValue().setFromInterface(classInfo.isInterface());
-                lines.addAll(f.getValue().format(indent + stepIndent, stepIndent));
+                lines.addAll(f.getValue().formatLines(indent + stepIndent, stepIndent));
             });
 
         // beans
@@ -254,21 +254,21 @@ public List<String> format(int indent, int stepIndent) {
                 lines.addAll(
                     new FormatterComments("Internal constructor, not callable unless via `java()`.")
                         .setStyle(FormatterComments.CommentStyle.J_DOC)
-                        .format(indent + stepIndent, stepIndent)
+                        .formatLines(indent + stepIndent, stepIndent)
                 );
             }
             classInfo
                 .getConstructors()
                 .stream()
                 .map(FormatterConstructor::new)
-                .forEach(f -> lines.addAll(f.format(indent + stepIndent, stepIndent)));
+                .forEach(f -> lines.addAll(f.formatLines(indent + stepIndent, stepIndent)));
         }
         // additions
         for (DocumentField fieldDoc : fieldAdditions) {
-            lines.addAll(fieldDoc.format(indent + stepIndent, stepIndent));
+            lines.addAll(fieldDoc.formatLines(indent + stepIndent, stepIndent));
         }
         for (DocumentMethod methodDoc : methodAdditions) {
-            lines.addAll(methodDoc.format(indent + stepIndent, stepIndent));
+            lines.addAll(methodDoc.formatLines(indent + stepIndent, stepIndent));
         }
         //end
         lines.add(PUtil.indent(indent) + "}");
diff --git a/src/main/java/com/probejs/formatter/FormatterComments.java b/src/main/java/com/probejs/formatter/FormatterComments.java
index dc260486..f92a9459 100644
--- a/src/main/java/com/probejs/formatter/FormatterComments.java
+++ b/src/main/java/com/probejs/formatter/FormatterComments.java
@@ -1,6 +1,6 @@
 package com.probejs.formatter;
 
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -12,7 +12,7 @@
 import java.util.Arrays;
 import java.util.List;
 
-public class FormatterComments implements IFormatter {
+public class FormatterComments implements MultiFormatter {
 
     @AllArgsConstructor
     @Getter
@@ -68,7 +68,7 @@ public FormatterComments trim() {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         val idnt = PUtil.indent(indent);
         val lines = new ArrayList<String>(2 + this.raw.size());
         if (this.style.begin != null) {
diff --git a/src/main/java/com/probejs/formatter/FormatterConstructor.java b/src/main/java/com/probejs/formatter/FormatterConstructor.java
index c86e4a22..099ad7b2 100644
--- a/src/main/java/com/probejs/formatter/FormatterConstructor.java
+++ b/src/main/java/com/probejs/formatter/FormatterConstructor.java
@@ -1,6 +1,6 @@
 package com.probejs.formatter;
 
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.formatter.resolver.NameResolver;
 import com.probejs.info.clazz.ClassInfo;
 import com.probejs.info.clazz.ConstructorInfo;
@@ -12,7 +12,7 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
-public class FormatterConstructor implements IFormatter {
+public class FormatterConstructor implements MultiFormatter {
 
     private final ConstructorInfo constructor;
 
@@ -58,7 +58,7 @@ private String formatParams() {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> lines = new ArrayList<>();
         lines.add(String.format("%sconstructor(%s);", PUtil.indent(indent), formatParams()));
         return lines;
diff --git a/src/main/java/com/probejs/formatter/FormatterField.java b/src/main/java/com/probejs/formatter/FormatterField.java
index 3c5886a9..8814d976 100644
--- a/src/main/java/com/probejs/formatter/FormatterField.java
+++ b/src/main/java/com/probejs/formatter/FormatterField.java
@@ -3,7 +3,7 @@
 import com.probejs.document.DocumentField;
 import com.probejs.document.comment.special.CommentHidden;
 import com.probejs.formatter.api.DocumentReceiver;
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.formatter.resolver.NameResolver;
 import com.probejs.info.clazz.FieldInfo;
 import com.probejs.info.type.TypeResolver;
@@ -15,7 +15,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-public class FormatterField extends DocumentReceiver<DocumentField> implements IFormatter {
+public class FormatterField extends DocumentReceiver<DocumentField> implements MultiFormatter {
 
     @Getter
     private final FieldInfo fieldInfo;
@@ -27,14 +27,14 @@ public FormatterField(FieldInfo fieldInfo) {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> lines = new ArrayList<>();
         val comment = document != null ? document.getComment() : null;
         if (comment != null) {
             if (comment.getSpecialComment(CommentHidden.class) != null) {
                 return lines;
             }
-            lines.addAll(comment.format(indent, stepIndent));
+            lines.addAll(comment.formatLines(indent, stepIndent));
         }
 
         val builder = new StringBuilder(PUtil.indent(indent));
diff --git a/src/main/java/com/probejs/formatter/FormatterMethod.java b/src/main/java/com/probejs/formatter/FormatterMethod.java
index e321a3d5..c3d050d5 100644
--- a/src/main/java/com/probejs/formatter/FormatterMethod.java
+++ b/src/main/java/com/probejs/formatter/FormatterMethod.java
@@ -7,7 +7,7 @@
 import com.probejs.document.comment.special.CommentReturns;
 import com.probejs.document.type.IDocType;
 import com.probejs.formatter.api.DocumentReceiver;
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.formatter.resolver.NameResolver;
 import com.probejs.info.clazz.MethodInfo;
 import com.probejs.info.type.IType;
@@ -22,7 +22,7 @@
 import java.util.stream.Collectors;
 import javax.annotation.Nullable;
 
-public class FormatterMethod extends DocumentReceiver<DocumentMethod> implements IFormatter {
+public class FormatterMethod extends DocumentReceiver<DocumentMethod> implements MultiFormatter {
 
     @Getter
     private final MethodInfo info;
@@ -227,7 +227,7 @@ public String formatParams(Map<String, String> renames, boolean forceNoUnderscor
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> formatted = new ArrayList<>();
 
         if (document != null) {
@@ -236,7 +236,7 @@ public List<String> format(int indent, int stepIndent) {
                 return formatted;
             }
             if (comment != null) {
-                formatted.addAll(comment.format(indent, stepIndent));
+                formatted.addAll(comment.formatLines(indent, stepIndent));
             }
         }
 
@@ -276,7 +276,7 @@ public List<String> formatBean(int indent, int stepIndent) {
         if (document != null) {
             DocumentComment comment = document.getComment();
             if (CommentUtil.isHidden(comment)) return lines;
-            if (comment != null) lines.addAll(comment.format(indent, stepIndent));
+            if (comment != null) lines.addAll(comment.formatLines(indent, stepIndent));
         }
 
         String idnt = PUtil.indent(indent);
diff --git a/src/main/java/com/probejs/formatter/FormatterNamespace.java b/src/main/java/com/probejs/formatter/FormatterNamespace.java
index c5cd558a..c2cb479c 100644
--- a/src/main/java/com/probejs/formatter/FormatterNamespace.java
+++ b/src/main/java/com/probejs/formatter/FormatterNamespace.java
@@ -1,13 +1,14 @@
 package com.probejs.formatter;
 
 import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 
-public class FormatterNamespace implements IFormatter {
+public class FormatterNamespace implements MultiFormatter {
 
     private final String path;
     private final Collection<? extends IFormatter> formatters;
@@ -23,11 +24,11 @@ public FormatterNamespace(String path, IFormatter ...formatters) {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> lines = new ArrayList<>();
         lines.add(PUtil.indent(indent) + String.format("declare namespace %s {", path));
         for (IFormatter formatter : formatters) {
-            lines.addAll(formatter.format(indent + stepIndent, stepIndent));
+            lines.addAll(formatter.formatLines(indent + stepIndent, stepIndent));
         }
         lines.add(PUtil.indent(indent) + "}");
         return lines;
diff --git a/src/main/java/com/probejs/formatter/FormatterRaw.java b/src/main/java/com/probejs/formatter/FormatterRaw.java
index d061f206..a8c28899 100644
--- a/src/main/java/com/probejs/formatter/FormatterRaw.java
+++ b/src/main/java/com/probejs/formatter/FormatterRaw.java
@@ -1,6 +1,6 @@
 package com.probejs.formatter;
 
-import com.probejs.formatter.api.IFormatter;
+import com.probejs.formatter.api.MultiFormatter;
 import com.probejs.util.PUtil;
 import lombok.Getter;
 import lombok.Setter;
@@ -8,7 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-public class FormatterRaw implements IFormatter {
+public class FormatterRaw implements MultiFormatter {
 
     private final List<String> docs;
     /**
@@ -31,7 +31,7 @@ public FormatterRaw(List<String> docs, boolean commentMark) {
     }
 
     @Override
-    public List<String> format(int indent, int stepIndent) {
+    public List<String> formatLines(int indent, int stepIndent) {
         List<String> lines = new ArrayList<>();
         String idnt = PUtil.indent(indent);
         if (commentMark) {
diff --git a/src/main/java/com/probejs/formatter/api/IFormatter.java b/src/main/java/com/probejs/formatter/api/IFormatter.java
index 4df2fede..ad76e1db 100644
--- a/src/main/java/com/probejs/formatter/api/IFormatter.java
+++ b/src/main/java/com/probejs/formatter/api/IFormatter.java
@@ -3,5 +3,6 @@
 import java.util.List;
 
 public interface IFormatter {
-    List<String> format(int indent, int stepIndent);
+    List<String> formatLines(int indent, int stepIndent);
+    String formatStr(int indent, int stepIndent);
 }
diff --git a/src/main/java/com/probejs/formatter/api/MultiFormatter.java b/src/main/java/com/probejs/formatter/api/MultiFormatter.java
new file mode 100644
index 00000000..9ba877ef
--- /dev/null
+++ b/src/main/java/com/probejs/formatter/api/MultiFormatter.java
@@ -0,0 +1,8 @@
+package com.probejs.formatter.api;
+
+public interface MultiFormatter extends IFormatter {
+    @Override
+    default String formatStr(int indent, int stepIndent) {
+        return String.join("\n",formatLines(indent, stepIndent));
+    }
+}
diff --git a/src/main/java/com/probejs/formatter/api/SingleFormatter.java b/src/main/java/com/probejs/formatter/api/SingleFormatter.java
new file mode 100644
index 00000000..f66f18ea
--- /dev/null
+++ b/src/main/java/com/probejs/formatter/api/SingleFormatter.java
@@ -0,0 +1,12 @@
+package com.probejs.formatter.api;
+
+import java.util.Collections;
+import java.util.List;
+
+public interface SingleFormatter extends IFormatter {
+
+    @Override
+    default List<String> formatLines(int indent, int stepIndent) {
+        return Collections.singletonList(formatStr(indent, stepIndent));
+    }
+}
diff --git a/src/main/java/com/probejs/info/ClassWalker.java b/src/main/java/com/probejs/info/ClassWalker.java
index b6cfbc2e..89e15ad3 100644
--- a/src/main/java/com/probejs/info/ClassWalker.java
+++ b/src/main/java/com/probejs/info/ClassWalker.java
@@ -13,8 +13,8 @@ public class ClassWalker {
 
     private final Set<Class<?>> initial;
 
-    public ClassWalker(Set<Class<?>> initial) {
-        this.initial = initial;
+    public ClassWalker(Collection<Class<?>> initial) {
+        this.initial = new HashSet<>(initial);
     }
 
     private Set<Class<?>> walkType(IType tInfo) {
@@ -42,7 +42,7 @@ private Set<Class<?>> walkType(IType tInfo) {
 
     private Set<Class<?>> walkTypes(Collection<? extends IType> tInfos) {
         Set<Class<?>> result = new HashSet<>();
-        for (IType tInfo : tInfos) {
+        for (val tInfo : tInfos) {
             result.addAll(walkType(tInfo));
         }
         return result;
@@ -62,7 +62,7 @@ private Set<Class<?>> touch(Set<Class<?>> classes) {
             }
             result.addAll(walkTypes(info.getInterfaces()));
             //field
-            for (FieldInfo fInfo : info.getFieldInfos()) {
+            for (val fInfo : info.getFieldInfos()) {
                 result.addAll(walkType(fInfo.getType()));
             }
             //method
@@ -89,7 +89,7 @@ public Set<Class<?>> walk() {
 
         while (!current.isEmpty()) {
             result.addAll(current);
-            current = touch(current).stream().filter(c -> !result.contains(c)).collect(Collectors.toSet());
+            current = touch(current).parallelStream().filter(c -> !result.contains(c)).collect(Collectors.toSet());
         }
         return result;
     }
diff --git a/src/main/java/com/probejs/info/EventInfo.java b/src/main/java/com/probejs/info/EventInfo.java
index 5e0f51dc..a6d53e96 100644
--- a/src/main/java/com/probejs/info/EventInfo.java
+++ b/src/main/java/com/probejs/info/EventInfo.java
@@ -76,7 +76,7 @@ public List<String> getBuiltinPropAsComment() {
             typeNames.add("unknown, info of this event seems fetched from an older version of cache");
         }
         return new FormatterComments("@cancellable " + canCancel, "@at " + String.join(", ", typeNames))
-            .format(0, 0);
+            .formatLines(0, 0);
     }
 
     @SuppressWarnings("unchecked")