---
title: Printer
---
The [LuaPrinter](https://github.com/TypeScriptToLua/TypeScriptToLua/blob/master/src/LuaPrinter.ts) class takes Lua AST and prints it to a string (with source map). The printer implements the [visitor pattern](https://en.wikipedia.org/wiki/Visitor_pattern). All methods visit nodes in the AST to print them to a [`SourceNode`](https://github.com/mozilla/source-map#sourcenode), this will automatically produce correct mappings in the resulting source map.
## API Reference
```ts
interface PrintResult {
code: string;
sourceMap: string;
sourceMapNode: SourceNode;
}
class LuaPrinter {
constructor(options: CompilerOptions, emitHost: EmitHost, fileName: string);
public print(block: lua.Block, luaLibFeatures: Set): PrintResult;
public printStatement(statement: lua.Statement): SourceNode;
public printDoStatement(statement: lua.DoStatement): SourceNode;
public printVariableDeclarationStatement(statement: lua.VariableDeclarationStatement): SourceNode;
public printVariableAssignmentStatement(statement: lua.AssignmentStatement): SourceNode;
public printIfStatement(statement: lua.IfStatement, isElseIf?: boolean): SourceNode;
public printWhileStatement(statement: lua.WhileStatement): SourceNode;
public printRepeatStatement(statement: lua.RepeatStatement): SourceNode;
public printForStatement(statement: lua.ForStatement): SourceNode;
public printForInStatement(statement: lua.ForInStatement): SourceNode;
public printGotoStatement(statement: lua.GotoStatement): SourceNode;
public printLabelStatement(statement: lua.LabelStatement): SourceNode;
public printReturnStatement(statement: lua.ReturnStatement): SourceNode;
public printBreakStatement(statement: lua.BreakStatement): SourceNode;
public printExpressionStatement(statement: lua.ExpressionStatement): SourceNode;
public printExpression(expression: lua.Expression): SourceNode;
public printStringLiteral(expression: lua.StringLiteral): SourceNode;
public printNumericLiteral(expression: lua.NumericLiteral): SourceNode;
public printNilLiteral(expression: lua.NilLiteral): SourceNode;
public printDotsLiteral(expression: lua.DotsLiteral): SourceNode;
public printBooleanLiteral(expression: lua.BooleanLiteral): SourceNode;
public printFunctionExpression(expression: lua.FunctionExpression): SourceNode;
public printFunctionDefinition(statement: lua.FunctionDefinition): SourceNode;
public printTableFieldExpression(expression: lua.TableFieldExpression): SourceNode;
public printTableExpression(expression: lua.TableExpression): SourceNode;
public printUnaryExpression(expression: lua.UnaryExpression): SourceNode;
public printBinaryExpression(expression: lua.BinaryExpression): SourceNode;
public printCallExpression(expression: lua.CallExpression): SourceNode;
public printMethodCallExpression(expression: lua.MethodCallExpression): SourceNode;
public printIdentifier(expression: lua.Identifier): SourceNode;
public printTableIndexExpression(expression: lua.TableIndexExpression): SourceNode;
public printOperator(kind: lua.Operator): SourceNode;
protected pushIndent(): void;
protected popIndent(): void;
protected indent(input?: SourceChunk): SourceChunk;
protected createSourceNode(node: lua.Node, chunks: SourceChunk | SourceChunk[], name?: string): SourceNode;
protected concatNodes(...chunks: SourceChunk[]): SourceNode;
protected printBlock(block: lua.Block): SourceNode;
protected printStatementArray(statements: lua.Statement[]): SourceChunk[];
protected isStatementEmpty(statement: lua.Statement): boolean;
protected joinChunks(separator: string, chunks: SourceChunk[]): SourceChunk[];
protected printExpressionList(expressions: lua.Expression[]): SourceChunk[];
}
```