SyntaxKind

Complete reference of TypeScript syntax kinds for AST node classification

The SyntaxKind enum identifies the type of each node in the TypeScript Abstract Syntax Tree (AST). Every node has a kind property that determines its type and structure.

export const enum SyntaxKind {
  Unknown,
  EndOfFileToken,
  // ... hundreds of kinds
}

Trivia and Tokens

Trivia (Comments and Whitespace)

Kind	Value	Description
Unknown	0	Unknown token
EndOfFileToken	1	End of file marker
SingleLineCommentTrivia	2	// comment
MultiLineCommentTrivia	3	/* comment */
NewLineTrivia	4	Line break
WhitespaceTrivia	5	Spaces and tabs
ShebangTrivia	6	#!/usr/bin/env node
ConflictMarkerTrivia	7	Git conflict markers

Literals

Primary Literals

Kind	Description	Example
NumericLiteral	Number literal	42, 3.14
BigIntLiteral	BigInt literal	100n
StringLiteral	String literal	"hello", 'world'
RegularExpressionLiteral	Regex literal	/pattern/g
NoSubstitutionTemplateLiteral	Template without expressions	`text`

Template Literals

Kind	Description
TemplateHead	`start ${
TemplateMiddle	} middle ${
TemplateTail	} end`

Punctuation

Braces and Brackets

Kind	Symbol
OpenBraceToken	{
CloseBraceToken	}
OpenParenToken	(
CloseParenToken	)
OpenBracketToken	[
CloseBracketToken	]

Operators

Kind	Symbol	Description
PlusToken	+	Addition
MinusToken	-	Subtraction
AsteriskToken	*	Multiplication
AsteriskAsteriskToken	**	Exponentiation
SlashToken	/	Division
PercentToken	%	Modulo
PlusPlusToken	++	Increment
MinusMinusToken	--	Decrement
LessThanToken	<	Less than
GreaterThanToken	>	Greater than
LessThanEqualsToken	<=	Less than or equal
GreaterThanEqualsToken	>=	Greater than or equal
EqualsEqualsToken	==	Equality
ExclamationEqualsToken	!=	Inequality
EqualsEqualsEqualsToken	===	Strict equality
ExclamationEqualsEqualsToken	!==	Strict inequality
EqualsGreaterThanToken	=>	Arrow function
AmpersandToken	&	Bitwise AND
BarToken	`	`	Bitwise OR
CaretToken	^	Bitwise XOR
TildeToken	~	Bitwise NOT
AmpersandAmpersandToken	&&	Logical AND
BarBarToken	`		`	Logical OR
QuestionQuestionToken	??	Nullish coalescing

Other Punctuation

Kind	Symbol
DotToken	.
DotDotDotToken	...
SemicolonToken	;
CommaToken	,
QuestionToken	?
ColonToken	:
AtToken	@
QuestionDotToken	?.
ExclamationToken	!

Assignment Operators

Kind	Symbol
EqualsToken	=
PlusEqualsToken	+=
MinusEqualsToken	-=
AsteriskEqualsToken	*=
AsteriskAsteriskEqualsToken	**=
SlashEqualsToken	/=
PercentEqualsToken	%=
AmpersandEqualsToken	&=
BarEqualsToken	`	=`
CaretEqualsToken	^=
AmpersandAmpersandEqualsToken	&&=
BarBarEqualsToken	`		=`
QuestionQuestionEqualsToken	??=

Keywords

Reserved Words

Keyword	SyntaxKind
break	BreakKeyword
case	CaseKeyword
catch	CatchKeyword
class	ClassKeyword
const	ConstKeyword
continue	ContinueKeyword
debugger	DebuggerKeyword
default	DefaultKeyword
delete	DeleteKeyword
do	DoKeyword
else	ElseKeyword
enum	EnumKeyword
export	ExportKeyword
extends	ExtendsKeyword
false	FalseKeyword
finally	FinallyKeyword
for	ForKeyword
function	FunctionKeyword
if	IfKeyword
import	ImportKeyword
in	InKeyword
instanceof	InstanceOfKeyword
new	NewKeyword
null	NullKeyword
return	ReturnKeyword
super	SuperKeyword
switch	SwitchKeyword
this	ThisKeyword
throw	ThrowKeyword
true	TrueKeyword
try	TryKeyword
typeof	TypeOfKeyword
var	VarKeyword
void	VoidKeyword
while	WhileKeyword
with	WithKeyword

Strict Mode Reserved Words

Keyword	SyntaxKind
implements	ImplementsKeyword
interface	InterfaceKeyword
let	LetKeyword
package	PackageKeyword
private	PrivateKeyword
protected	ProtectedKeyword
public	PublicKeyword
static	StaticKeyword
yield	YieldKeyword

Contextual Keywords

Keyword	SyntaxKind	Usage
abstract	AbstractKeyword	Abstract classes/methods
accessor	AccessorKeyword	Auto-accessor fields
any	AnyKeyword	Any type
as	AsKeyword	Type assertions
asserts	AssertsKeyword	Assertion signatures
assert	AssertKeyword	Import assertions
async	AsyncKeyword	Async functions
await	AwaitKeyword	Await expressions
boolean	BooleanKeyword	Boolean type
constructor	ConstructorKeyword	Constructors
declare	DeclareKeyword	Ambient declarations
get	GetKeyword	Getter methods
infer	InferKeyword	Type inference
intrinsic	IntrinsicKeyword	Intrinsic types
is	IsKeyword	Type predicates
keyof	KeyOfKeyword	Keyof operator
module	ModuleKeyword	Module declarations
namespace	NamespaceKeyword	Namespaces
never	NeverKeyword	Never type
number	NumberKeyword	Number type
object	ObjectKeyword	Object type
out	OutKeyword	Covariance annotation
override	OverrideKeyword	Override modifier
readonly	ReadonlyKeyword	Readonly modifier
require	RequireKeyword	Require calls
satisfies	SatisfiesKeyword	Satisfies operator
set	SetKeyword	Setter methods
string	StringKeyword	String type
symbol	SymbolKeyword	Symbol type
type	TypeKeyword	Type aliases
undefined	UndefinedKeyword	Undefined type
unique	UniqueKeyword	Unique symbols
unknown	UnknownKeyword	Unknown type
using	UsingKeyword	Using declarations
from	FromKeyword	Import from
global	GlobalKeyword	Global augmentation
bigint	BigIntKeyword	BigInt type
of	OfKeyword	For-of loops
defer	DeferKeyword	Deferred evaluation

Parse Tree Nodes

Names

• QualifiedName - A.B.C
• ComputedPropertyName - [expr]

Type Members

• PropertySignature
• PropertyDeclaration
• MethodSignature
• MethodDeclaration
• Constructor
• GetAccessor
• SetAccessor
• CallSignature
• ConstructSignature
• IndexSignature

Types

• TypePredicate
• TypeReference
• FunctionType
• ConstructorType
• TypeQuery
• TypeLiteral
• ArrayType
• TupleType
• UnionType
• IntersectionType
• ConditionalType
• InferType
• MappedType
• TemplateLiteralType
• ImportType

Expressions

• ArrayLiteralExpression
• ObjectLiteralExpression
• PropertyAccessExpression
• ElementAccessExpression
• CallExpression
• NewExpression
• TaggedTemplateExpression
• TypeAssertionExpression
• ParenthesizedExpression
• FunctionExpression
• ArrowFunction
• DeleteExpression
• TypeOfExpression
• VoidExpression
• AwaitExpression
• PrefixUnaryExpression
• PostfixUnaryExpression
• BinaryExpression
• ConditionalExpression
• YieldExpression
• SpreadElement
• ClassExpression
• AsExpression
• NonNullExpression
• SatisfiesExpression

Statements

• Block
• VariableStatement
• ExpressionStatement
• IfStatement
• DoStatement
• WhileStatement
• ForStatement
• ForInStatement
• ForOfStatement
• ContinueStatement
• BreakStatement
• ReturnStatement
• WithStatement
• SwitchStatement
• LabeledStatement
• ThrowStatement
• TryStatement
• DebuggerStatement

Declarations

• VariableDeclaration
• FunctionDeclaration
• ClassDeclaration
• InterfaceDeclaration
• TypeAliasDeclaration
• EnumDeclaration
• ModuleDeclaration
• ImportDeclaration
• ExportDeclaration
• ImportEqualsDeclaration
• ExportAssignment

JSX

• JsxElement
• JsxSelfClosingElement
• JsxOpeningElement
• JsxClosingElement
• JsxFragment
• JsxAttribute
• JsxSpreadAttribute
• JsxExpression

Other

• SourceFile - Root node
• Bundle - Multiple source files
• SyntaxList - List of nodes

Helper Markers

The enum includes helper values for ranges:

FirstAssignment = EqualsToken,
LastAssignment = CaretEqualsToken,
FirstReservedWord = BreakKeyword,
LastReservedWord = WithKeyword,
FirstKeyword = BreakKeyword,
LastKeyword = DeferKeyword,
FirstPunctuation = OpenBraceToken,
LastPunctuation = CaretEqualsToken,

Usage

Checking Node Kind

import ts from 'typescript';

if (node.kind === ts.SyntaxKind.FunctionDeclaration) {
  console.log('Found a function declaration');
}

// Or use type guards
if (ts.isFunctionDeclaration(node)) {
  console.log('Found a function declaration');
}

Getting Kind Name

const kindName = ts.SyntaxKind[node.kind];
console.log(`Node kind: ${kindName}`);

See Also

• Node Types - Node type hierarchy
• TypeFlags - Type system flags
• Compiler Overview - TypeScript compiler architecture