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Install

npm install --save-dev @babel/types

API

anyTypeAnnotation

t.anyTypeAnnotation()

See also t.isAnyTypeAnnotation(node, opts) and t.assertAnyTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

---

arrayExpression

t.arrayExpression(elements)

See also t.isArrayExpression(node, opts) and t.assertArrayExpression(node, opts).

Aliases: Expression

• elements: Array<null | Expression | SpreadElement> (default: [])

---

argumentPlaceholder

t.argumentPlaceholder()

See also t.isArgumentPlaceholder(node, opts) and t.assertArgumentPlaceholder(node, opts).

Aliases: none

---

arrayPattern

t.arrayPattern(elements)

See also t.isArrayPattern(node, opts) and t.assertArrayPattern(node, opts).

Aliases: Pattern, PatternLike, LVal

• elements: Array<PatternLike> (required)
• decorators: Array<Decorator> (default: null)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null)

---

arrayTypeAnnotation

t.arrayTypeAnnotation(elementType)

See also t.isArrayTypeAnnotation(node, opts) and t.assertArrayTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• elementType: FlowType (required)

---

arrowFunctionExpression

t.arrowFunctionExpression(params, body, async)

See also t.isArrowFunctionExpression(node, opts) and t.assertArrowFunctionExpression(node, opts).

Aliases: Scopable, Function, BlockParent, FunctionParent, Expression, Pureish

• params: Array<LVal> (required)
• body: BlockStatement | Expression (required)
• async: boolean (default: false)
• expression: boolean (default: null)
• generator: boolean (default: false)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null)

---

assignmentExpression

t.assignmentExpression(operator, left, right)

See also t.isAssignmentExpression(node, opts) and t.assertAssignmentExpression(node, opts).

Aliases: Expression

• operator: string (required)
• left: LVal (required)
• right: Expression (required)

---

assignmentPattern

t.assignmentPattern(left, right)

See also t.isAssignmentPattern(node, opts) and t.assertAssignmentPattern(node, opts).

Aliases: Pattern, PatternLike, LVal

• left: Identifier | ObjectPattern | ArrayPattern (required)
• right: Expression (required)
• decorators: Array<Decorator> (default: null)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null)

---

awaitExpression

t.awaitExpression(argument)

See also t.isAwaitExpression(node, opts) and t.assertAwaitExpression(node, opts).

Aliases: Expression, Terminatorless

• argument: Expression (required)

---

bigIntLiteral

t.bigIntLiteral(value)

See also t.isBigIntLiteral(node, opts) and t.assertBigIntLiteral(node, opts).

Aliases: Expression, Pureish, Literal, Immutable

• value: string (required)

---

binaryExpression

t.binaryExpression(operator, left, right)

See also t.isBinaryExpression(node, opts) and t.assertBinaryExpression(node, opts).

Aliases: Binary, Expression

• operator: "+" | "-" | "/" | "%" | "*" | "**" | "&" | "|" | ">>" | ">>>" | "<<" | "^" | "==" | "===" | "!=" | "!==" | "in" | "instanceof" | ">" | "<" | ">=" | "<=" (required)
• left: Expression (required)
• right: Expression (required)

---

bindExpression

t.bindExpression(object, callee)

See also t.isBindExpression(node, opts) and t.assertBindExpression(node, opts).

Aliases: Expression

• object (required)
• callee (required)

---

blockStatement

t.blockStatement(body, directives)

See also t.isBlockStatement(node, opts) and t.assertBlockStatement(node, opts).

Aliases: Scopable, BlockParent, Block, Statement

• body: Array<Statement> (required)
• directives: Array<Directive> (default: [])

---

booleanLiteral

t.booleanLiteral(value)

See also t.isBooleanLiteral(node, opts) and t.assertBooleanLiteral(node, opts).

Aliases: Expression, Pureish, Literal, Immutable

• value: boolean (required)

---

booleanLiteralTypeAnnotation

t.booleanLiteralTypeAnnotation(value)

See also t.isBooleanLiteralTypeAnnotation(node, opts) and t.assertBooleanLiteralTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• value: boolean (required)

---

booleanTypeAnnotation

t.booleanTypeAnnotation()

See also t.isBooleanTypeAnnotation(node, opts) and t.assertBooleanTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

---

breakStatement

t.breakStatement(label)

See also t.isBreakStatement(node, opts) and t.assertBreakStatement(node, opts).

Aliases: Statement, Terminatorless, CompletionStatement

• label: Identifier (default: null)

---

callExpression

t.callExpression(callee, arguments)

See also t.isCallExpression(node, opts) and t.assertCallExpression(node, opts).

Aliases: Expression

• callee: Expression (required)
• arguments: Array<Expression | SpreadElement | JSXNamespacedName> (required)
• optional: true | false (default: null)
• typeArguments: TypeParameterInstantiation (default: null)
• typeParameters: TSTypeParameterInstantiation (default: null)

---

catchClause

t.catchClause(param, body)

See also t.isCatchClause(node, opts) and t.assertCatchClause(node, opts).

Aliases: Scopable, BlockParent

• param: Identifier (default: null)
• body: BlockStatement (required)

---

classBody

t.classBody(body)

See also t.isClassBody(node, opts) and t.assertClassBody(node, opts).

• body: Array<ClassMethod | ClassProperty | ClassPrivateProperty | TSDeclareMethod | TSIndexSignature> (required)

---

classDeclaration

t.classDeclaration(id, superClass, body, decorators)

See also t.isClassDeclaration(node, opts) and t.assertClassDeclaration(node, opts).

Aliases: Scopable, Class, Statement, Declaration, Pureish

• id: Identifier (default: null)
• superClass: Expression (default: null)
• body: ClassBody (required)
• decorators: Array<Decorator> (default: null)
• abstract: boolean (default: null)
• declare: boolean (default: null)
• implements: Array<TSExpressionWithTypeArguments | ClassImplements> (default: null)
• mixins (default: null)
• superTypeParameters: TypeParameterInstantiation | TSTypeParameterInstantiation (default: null)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null)

---

classExpression

t.classExpression(id, superClass, body, decorators)

See also t.isClassExpression(node, opts) and t.assertClassExpression(node, opts).

Aliases: Scopable, Class, Expression, Pureish

• id: Identifier (default: null)
• superClass: Expression (default: null)
• body: ClassBody (required)
• decorators: Array<Decorator> (default: null)
• implements: Array<TSExpressionWithTypeArguments | ClassImplements> (default: null)
• mixins (default: null)
• superTypeParameters: TypeParameterInstantiation | TSTypeParameterInstantiation (default: null)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null)

---

classImplements

t.classImplements(id, typeParameters)

See also t.isClassImplements(node, opts) and t.assertClassImplements(node, opts).

Aliases: Flow

• id: Identifier (required)
• typeParameters: TypeParameterInstantiation (default: null)

---

classMethod

t.classMethod(kind, key, params, body, computed, static)

See also t.isClassMethod(node, opts) and t.assertClassMethod(node, opts).

Aliases: Function, Scopable, BlockParent, FunctionParent, Method

• kind: "get" | "set" | "method" | "constructor" (default: 'method')
• key: if computed then Expression else Identifier | Literal (required)
• params: Array<LVal> (required)
• body: BlockStatement (required)
• computed: boolean (default: false)
• static: boolean (default: null)
• abstract: boolean (default: null)
• access: "public" | "private" | "protected" (default: null)
• accessibility: "public" | "private" | "protected" (default: null)
• async: boolean (default: false)
• decorators: Array<Decorator> (default: null)
• generator: boolean (default: false)
• optional: boolean (default: null)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null)

---

classPrivateProperty

t.classPrivateProperty(key, value)

See also t.isClassPrivateProperty(node, opts) and t.assertClassPrivateProperty(node, opts).

Aliases: Property, Private

• key: PrivateName (required)
• value: Expression (default: null)

---

classProperty

t.classProperty(key, value, typeAnnotation, decorators, computed)

See also t.isClassProperty(node, opts) and t.assertClassProperty(node, opts).

Aliases: Property

• key: Identifier | StringLiteral | NumericLiteral | Expression (required)
• value: Expression (default: null)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null)
• decorators: Array<Decorator> (default: null)
• computed: boolean (default: false)
• abstract: boolean (default: null)
• accessibility: "public" | "private" | "protected" (default: null)
• definite: boolean (default: null)
• optional: boolean (default: null)
• readonly: boolean (default: null)
• static: boolean (default: null)

---

conditionalExpression

t.conditionalExpression(test, consequent, alternate)

See also t.isConditionalExpression(node, opts) and t.assertConditionalExpression(node, opts).

Aliases: Expression, Conditional

• test: Expression (required)
• consequent: Expression (required)
• alternate: Expression (required)

---

continueStatement

t.continueStatement(label)

See also t.isContinueStatement(node, opts) and t.assertContinueStatement(node, opts).

Aliases: Statement, Terminatorless, CompletionStatement

• label: Identifier (default: null)

---

debuggerStatement

t.debuggerStatement()

See also t.isDebuggerStatement(node, opts) and t.assertDebuggerStatement(node, opts).

Aliases: Statement

---

declareClass

t.declareClass(id, typeParameters, extends, body)

See also t.isDeclareClass(node, opts) and t.assertDeclareClass(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• typeParameters: TypeParameterInstantiation (default: null)
• extends: Array<InterfaceExtends> (default: null)
• body: ObjectTypeAnnotation (required)
• implements: Array<ClassImplements> (default: null)
• mixins: Array<InterfaceExtends> (default: null)

---

declareExportAllDeclaration

t.declareExportAllDeclaration(source)

See also t.isDeclareExportAllDeclaration(node, opts) and t.assertDeclareExportAllDeclaration(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• source: StringLiteral (required)
• exportKind: ["type","value"] (default: null)

---

declareExportDeclaration

t.declareExportDeclaration(declaration, specifiers, source)

See also t.isDeclareExportDeclaration(node, opts) and t.assertDeclareExportDeclaration(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• declaration: Flow (default: null)
• specifiers: Array<ExportSpecifier | ExportNamespaceSpecifier> (default: null)
• source: StringLiteral (default: null)
• default: boolean (default: null)

---

declareFunction

t.declareFunction(id)

See also t.isDeclareFunction(node, opts) and t.assertDeclareFunction(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• predicate: DeclaredPredicate (default: null)

---

declareInterface

t.declareInterface(id, typeParameters, extends, body)

See also t.isDeclareInterface(node, opts) and t.assertDeclareInterface(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• typeParameters: TypeParameterDeclaration (default: null)
• extends: Array<InterfaceExtends> (default: null)
• body: ObjectTypeAnnotation (required)
• implements: Array<ClassImplements> (default: null)
• mixins: Array<InterfaceExtends> (default: null)

---

declareModule

t.declareModule(id, body, kind)

See also t.isDeclareModule(node, opts) and t.assertDeclareModule(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier | StringLiteral (required)
• body: BlockStatement (required)
• kind: "CommonJS" | "ES" (default: null)

---

declareModuleExports

t.declareModuleExports(typeAnnotation)

See also t.isDeclareModuleExports(node, opts) and t.assertDeclareModuleExports(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• typeAnnotation: TypeAnnotation (required)

---

declareOpaqueType

t.declareOpaqueType(id, typeParameters, supertype)

See also t.isDeclareOpaqueType(node, opts) and t.assertDeclareOpaqueType(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• typeParameters: TypeParameterDeclaration (default: null)
• supertype: FlowType (default: null)

---

declareTypeAlias

t.declareTypeAlias(id, typeParameters, right)

See also t.isDeclareTypeAlias(node, opts) and t.assertDeclareTypeAlias(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• typeParameters: TypeParameterDeclaration (default: null)
• right: FlowType (required)

---

declareVariable

t.declareVariable(id)

See also t.isDeclareVariable(node, opts) and t.assertDeclareVariable(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)

---

declaredPredicate

t.declaredPredicate(value)

See also t.isDeclaredPredicate(node, opts) and t.assertDeclaredPredicate(node, opts).

Aliases: Flow, FlowPredicate

• value: Flow (required)

---

decorator

t.decorator(expression)

See also t.isDecorator(node, opts) and t.assertDecorator(node, opts).

• expression: Expression (required)

---

directive

t.directive(value)

See also t.isDirective(node, opts) and t.assertDirective(node, opts).

• value: DirectiveLiteral (required)

---

directiveLiteral

t.directiveLiteral(value)

See also t.isDirectiveLiteral(node, opts) and t.assertDirectiveLiteral(node, opts).

• value: string (required)

---

doExpression

t.doExpression(body)

See also t.isDoExpression(node, opts) and t.assertDoExpression(node, opts).

Aliases: Expression

• body: BlockStatement (required)

---

doWhileStatement

t.doWhileStatement(test, body)

See also t.isDoWhileStatement(node, opts) and t.assertDoWhileStatement(node, opts).

Aliases: Statement, BlockParent, Loop, While, Scopable

• test: Expression (required)
• body: Statement (required)

---

emptyStatement

t.emptyStatement()

See also t.isEmptyStatement(node, opts) and t.assertEmptyStatement(node, opts).

Aliases: Statement

---

emptyTypeAnnotation

t.emptyTypeAnnotation()

See also t.isEmptyTypeAnnotation(node, opts) and t.assertEmptyTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

---

existsTypeAnnotation

t.existsTypeAnnotation()

See also t.isExistsTypeAnnotation(node, opts) and t.assertExistsTypeAnnotation(node, opts).

Aliases: Flow, FlowType

---

exportAllDeclaration

t.exportAllDeclaration(source)

See also t.isExportAllDeclaration(node, opts) and t.assertExportAllDeclaration(node, opts).

Aliases: Statement, Declaration, ModuleDeclaration, ExportDeclaration

• source: StringLiteral (required)

---

exportDefaultDeclaration

t.exportDefaultDeclaration(declaration)

See also t.isExportDefaultDeclaration(node, opts) and t.assertExportDefaultDeclaration(node, opts).

Aliases: Statement, Declaration, ModuleDeclaration, ExportDeclaration

• declaration: FunctionDeclaration | TSDeclareFunction | ClassDeclaration | Expression (required)

---

exportDefaultSpecifier

t.exportDefaultSpecifier(exported)

See also t.isExportDefaultSpecifier(node, opts) and t.assertExportDefaultSpecifier(node, opts).

Aliases: ModuleSpecifier

• exported: Identifier (required)

---

exportNamedDeclaration

t.exportNamedDeclaration(declaration, specifiers, source)

See also t.isExportNamedDeclaration(node, opts) and t.assertExportNamedDeclaration(node, opts).

Aliases: Statement, Declaration, ModuleDeclaration, ExportDeclaration

• declaration: Declaration (default: null)
• specifiers: Array<ExportSpecifier | ExportDefaultSpecifier | ExportNamespaceSpecifier> (required)
• source: StringLiteral (default: null)

---

exportNamespaceSpecifier

t.exportNamespaceSpecifier(exported)

See also t.isExportNamespaceSpecifier(node, opts) and t.assertExportNamespaceSpecifier(node, opts).

Aliases: ModuleSpecifier

• exported: Identifier (required)

---

exportSpecifier

t.exportSpecifier(local, exported)

See also t.isExportSpecifier(node, opts) and t.assertExportSpecifier(node, opts).

Aliases: ModuleSpecifier

• local: Identifier (required)
• exported: Identifier (required)

---

expressionStatement

t.expressionStatement(expression)

See also t.isExpressionStatement(node, opts) and t.assertExpressionStatement(node, opts).

Aliases: Statement, ExpressionWrapper

• expression: Expression (required)

---

file

t.file(program, comments, tokens)

See also t.isFile(node, opts) and t.assertFile(node, opts).

• program: Program (required)
• comments (required)
• tokens (required)

---

forInStatement

t.forInStatement(left, right, body)

See also t.isForInStatement(node, opts) and t.assertForInStatement(node, opts).

Aliases: Scopable, Statement, For, BlockParent, Loop, ForXStatement

• left: VariableDeclaration | LVal (required)
• right: Expression (required)
• body: Statement (required)

---

forOfStatement

t.forOfStatement(left, right, body)

See also t.isForOfStatement(node, opts) and t.assertForOfStatement(node, opts).

Aliases: Scopable, Statement, For, BlockParent, Loop, ForXStatement

• left: VariableDeclaration | LVal (required)
• right: Expression (required)
• body: Statement (required)
• await: boolean (default: false)

---

forStatement

t.forStatement(init, test, update, body)

See also t.isForStatement(node, opts) and t.assertForStatement(node, opts).

Aliases: Scopable, Statement, For, BlockParent, Loop

• init: VariableDeclaration | Expression (default: null)
• test: Expression (default: null)
• update: Expression (default: null)
• body: Statement (required)

---

functionDeclaration

t.functionDeclaration(id, params, body, generator, async)

See also t.isFunctionDeclaration(node, opts) and t.assertFunctionDeclaration(node, opts).

Aliases: Scopable, Function, BlockParent, FunctionParent, Statement, Pureish, Declaration

• id: Identifier (default: null)
• params: Array<LVal> (required)
• body: BlockStatement (required)
• generator: boolean (default: false)
• async: boolean (default: false)
• declare: boolean (default: null)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null)

---

functionExpression

t.functionExpression(id, params, body, generator, async)

See also t.isFunctionExpression(node, opts) and t.assertFunctionExpression(node, opts).

Aliases: Scopable, Function, BlockParent, FunctionParent, Expression, Pureish

• id: Identifier (default: null)
• params: Array<LVal> (required)
• body: BlockStatement (required)
• generator: boolean (default: false)
• async: boolean (default: false)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null)

---

functionTypeAnnotation

t.functionTypeAnnotation(typeParameters, params, rest, returnType)

See also t.isFunctionTypeAnnotation(node, opts) and t.assertFunctionTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• typeParameters: TypeParameterDeclaration (default: null)
• params: Array<FunctionTypeParam> (required)
• rest: FunctionTypeParam (default: null)
• returnType: FlowType (required)

---

functionTypeParam

t.functionTypeParam(name, typeAnnotation)

See also t.isFunctionTypeParam(node, opts) and t.assertFunctionTypeParam(node, opts).

Aliases: Flow

• name: Identifier (default: null)
• typeAnnotation: FlowType (required)
• optional: boolean (default: null)

---

genericTypeAnnotation

t.genericTypeAnnotation(id, typeParameters)

See also t.isGenericTypeAnnotation(node, opts) and t.assertGenericTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• id: Identifier (required)
• typeParameters: TypeParameterInstantiation (default: null)

---

identifier

t.identifier(name)

See also t.isIdentifier(node, opts) and t.assertIdentifier(node, opts).

Aliases: Expression, PatternLike, LVal, TSEntityName

• name: string (required)
• decorators: Array<Decorator> (default: null)
• optional: boolean (default: null)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null)

---

ifStatement

t.ifStatement(test, consequent, alternate)

See also t.isIfStatement(node, opts) and t.assertIfStatement(node, opts).

Aliases: Statement, Conditional

• test: Expression (required)
• consequent: Statement (required)
• alternate: Statement (default: null)

---

import

t.import()

See also t.isImport(node, opts) and t.assertImport(node, opts).

Aliases: Expression

---

importDeclaration

t.importDeclaration(specifiers, source)

See also t.isImportDeclaration(node, opts) and t.assertImportDeclaration(node, opts).

Aliases: Statement, Declaration, ModuleDeclaration

• specifiers: Array<ImportSpecifier | ImportDefaultSpecifier | ImportNamespaceSpecifier> (required)
• source: StringLiteral (required)

---

importDefaultSpecifier

t.importDefaultSpecifier(local)

See also t.isImportDefaultSpecifier(node, opts) and t.assertImportDefaultSpecifier(node, opts).

Aliases: ModuleSpecifier

• local: Identifier (required)

---

importNamespaceSpecifier

t.importNamespaceSpecifier(local)

See also t.isImportNamespaceSpecifier(node, opts) and t.assertImportNamespaceSpecifier(node, opts).

Aliases: ModuleSpecifier

• local: Identifier (required)

---

importSpecifier

t.importSpecifier(local, imported)

See also t.isImportSpecifier(node, opts) and t.assertImportSpecifier(node, opts).

Aliases: ModuleSpecifier

• local: Identifier (required)
• imported: Identifier (required)
• importKind: null | "type" | "typeof" (default: null)

---

inferredPredicate

t.inferredPredicate()

See also t.isInferredPredicate(node, opts) and t.assertInferredPredicate(node, opts).

Aliases: Flow, FlowPredicate

---

interfaceDeclaration

t.interfaceDeclaration(id, typeParameters, extends, body)

See also t.isInterfaceDeclaration(node, opts) and t.assertInterfaceDeclaration(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• typeParameters: TypeParameterDeclaration (default: null)
• extends: Array<InterfaceExtends> (default: null)
• body: ObjectTypeAnnotation (required)
• implements: Array<ClassImplements> (default: null)
• mixins: Array<InterfaceExtends> (default: null)

---

interfaceExtends

t.interfaceExtends(id, typeParameters)

See also t.isInterfaceExtends(node, opts) and t.assertInterfaceExtends(node, opts).

Aliases: Flow

• id: Identifier (required)
• typeParameters: TypeParameterInstantiation (default: null)

---

interfaceTypeAnnotation

t.interfaceTypeAnnotation(extends, body)

See also t.isInterfaceTypeAnnotation(node, opts) and t.assertInterfaceTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• extends: Array<InterfaceExtends> (default: null)
• body: ObjectTypeAnnotation (required)

---

interpreterDirective

t.interpreterDirective(value)

See also t.isInterpreterDirective(node, opts) and t.assertInterpreterDirective(node, opts).

• value: string (required)

---

intersectionTypeAnnotation

t.intersectionTypeAnnotation(types)

See also t.isIntersectionTypeAnnotation(node, opts) and t.assertIntersectionTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• types: Array<FlowType> (required)

---

jSXAttribute

t.jsxAttribute(name, value)

See also t.isJSXAttribute(node, opts) and t.assertJSXAttribute(node, opts).

Aliases: JSX, Immutable

• name: JSXIdentifier | JSXNamespacedName (required)
• value: JSXElement | JSXFragment | StringLiteral | JSXExpressionContainer (default: null)

---

jSXClosingElement

t.jsxClosingElement(name)

See also t.isJSXClosingElement(node, opts) and t.assertJSXClosingElement(node, opts).

Aliases: JSX, Immutable

• name: JSXIdentifier | JSXMemberExpression (required)

---

jSXClosingFragment

t.jsxClosingFragment()

See also t.isJSXClosingFragment(node, opts) and t.assertJSXClosingFragment(node, opts).

Aliases: JSX, Immutable

---

jSXElement

t.jsxElement(openingElement, closingElement, children, selfClosing)

See also t.isJSXElement(node, opts) and t.assertJSXElement(node, opts).

Aliases: JSX, Immutable, Expression

• openingElement: JSXOpeningElement (required)
• closingElement: JSXClosingElement (default: null)
• children: Array<JSXText | JSXExpressionContainer | JSXSpreadChild | JSXElement | JSXFragment> (required)
• selfClosing (required)

---

jSXEmptyExpression

t.jsxEmptyExpression()

See also t.isJSXEmptyExpression(node, opts) and t.assertJSXEmptyExpression(node, opts).

Aliases: JSX

---

jSXExpressionContainer

t.jsxExpressionContainer(expression)

See also t.isJSXExpressionContainer(node, opts) and t.assertJSXExpressionContainer(node, opts).

Aliases: JSX, Immutable

• expression: Expression (required)

---

jSXFragment

t.jsxFragment(openingFragment, closingFragment, children)

See also t.isJSXFragment(node, opts) and t.assertJSXFragment(node, opts).

Aliases: JSX, Immutable, Expression

• openingFragment: JSXOpeningFragment (required)
• closingFragment: JSXClosingFragment (required)
• children: Array<JSXText | JSXExpressionContainer | JSXSpreadChild | JSXElement | JSXFragment> (required)

---

jSXIdentifier

t.jsxIdentifier(name)

See also t.isJSXIdentifier(node, opts) and t.assertJSXIdentifier(node, opts).

Aliases: JSX

• name: string (required)

---

jSXMemberExpression

t.jsxMemberExpression(object, property)

See also t.isJSXMemberExpression(node, opts) and t.assertJSXMemberExpression(node, opts).

Aliases: JSX

• object: JSXMemberExpression | JSXIdentifier (required)
• property: JSXIdentifier (required)

---

jSXNamespacedName

t.jsxNamespacedName(namespace, name)

See also t.isJSXNamespacedName(node, opts) and t.assertJSXNamespacedName(node, opts).

Aliases: JSX

• namespace: JSXIdentifier (required)
• name: JSXIdentifier (required)

---

jSXOpeningElement

t.jsxOpeningElement(name, attributes, selfClosing)

See also t.isJSXOpeningElement(node, opts) and t.assertJSXOpeningElement(node, opts).

Aliases: JSX, Immutable

• name: JSXIdentifier | JSXMemberExpression (required)
• attributes: Array<JSXAttribute | JSXSpreadAttribute> (required)
• selfClosing: boolean (default: false)

---

jSXOpeningFragment

t.jsxOpeningFragment()

See also t.isJSXOpeningFragment(node, opts) and t.assertJSXOpeningFragment(node, opts).

Aliases: JSX, Immutable

---

jSXSpreadAttribute

t.jsxSpreadAttribute(argument)

See also t.isJSXSpreadAttribute(node, opts) and t.assertJSXSpreadAttribute(node, opts).

Aliases: JSX

• argument: Expression (required)

---

jSXSpreadChild

t.jsxSpreadChild(expression)

See also t.isJSXSpreadChild(node, opts) and t.assertJSXSpreadChild(node, opts).

Aliases: JSX, Immutable

• expression: Expression (required)

---

jSXText

t.jsxText(value)

See also t.isJSXText(node, opts) and t.assertJSXText(node, opts).

Aliases: JSX, Immutable

• value: string (required)

---

labeledStatement

t.labeledStatement(label, body)

See also t.isLabeledStatement(node, opts) and t.assertLabeledStatement(node, opts).

Aliases: Statement

• label: Identifier (required)
• body: Statement (required)

---

logicalExpression

t.logicalExpression(operator, left, right)

See also t.isLogicalExpression(node, opts) and t.assertLogicalExpression(node, opts).

Aliases: Binary, Expression

• operator: "||" | "&&" | "??" (required)
• left: Expression (required)
• right: Expression (required)

---

memberExpression

t.memberExpression(object, property, computed, optional)

See also t.isMemberExpression(node, opts) and t.assertMemberExpression(node, opts).

Aliases: Expression, LVal

• object: Expression (required)
• property: if computed then Expression else Identifier (required)
• computed: boolean (default: false)
• optional: true | false (default: null)

---

metaProperty

t.metaProperty(meta, property)

See also t.isMetaProperty(node, opts) and t.assertMetaProperty(node, opts).

Aliases: Expression

• meta: Identifier (required)
• property: Identifier (required)

---

mixedTypeAnnotation

t.mixedTypeAnnotation()

See also t.isMixedTypeAnnotation(node, opts) and t.assertMixedTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

---

newExpression

t.newExpression(callee, arguments)

See also t.isNewExpression(node, opts) and t.assertNewExpression(node, opts).

Aliases: Expression

• callee: Expression (required)
• arguments: Array<Expression | SpreadElement | JSXNamespacedName> (required)
• optional: true | false (default: null)
• typeArguments: TypeParameterInstantiation (default: null)
• typeParameters: TSTypeParameterInstantiation (default: null)

---

noop

t.noop()

See also t.isNoop(node, opts) and t.assertNoop(node, opts).

---

nullLiteral

t.nullLiteral()

See also t.isNullLiteral(node, opts) and t.assertNullLiteral(node, opts).

Aliases: Expression, Pureish, Literal, Immutable

---

nullLiteralTypeAnnotation

t.nullLiteralTypeAnnotation()

See also t.isNullLiteralTypeAnnotation(node, opts) and t.assertNullLiteralTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

---

nullableTypeAnnotation

t.nullableTypeAnnotation(typeAnnotation)

See also t.isNullableTypeAnnotation(node, opts) and t.assertNullableTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• typeAnnotation: FlowType (required)

---

numberLiteralTypeAnnotation

t.numberLiteralTypeAnnotation(value)

See also t.isNumberLiteralTypeAnnotation(node, opts) and t.assertNumberLiteralTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• value: number (required)

---

numberTypeAnnotation

t.numberTypeAnnotation()

See also t.isNumberTypeAnnotation(node, opts) and t.assertNumberTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

---

numericLiteral

t.numericLiteral(value)

See also t.isNumericLiteral(node, opts) and t.assertNumericLiteral(node, opts).

Aliases: Expression, Pureish, Literal, Immutable

• value: number (required)

---

objectExpression

t.objectExpression(properties)

See also t.isObjectExpression(node, opts) and t.assertObjectExpression(node, opts).

Aliases: Expression

• properties: Array<ObjectMethod | ObjectProperty | SpreadElement> (required)

---

objectMethod

t.objectMethod(kind, key, params, body, computed)

See also t.isObjectMethod(node, opts) and t.assertObjectMethod(node, opts).

Aliases: UserWhitespacable, Function, Scopable, BlockParent, FunctionParent, Method, ObjectMember

• kind: "method" | "get" | "set" (default: 'method')
• key: if computed then Expression else Identifier | Literal (required)
• params: Array<LVal> (required)
• body: BlockStatement (required)
• computed: boolean (default: false)
• async: boolean (default: false)
• decorators: Array<Decorator> (default: null)
• generator: boolean (default: false)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null)

---

objectPattern

t.objectPattern(properties)

See also t.isObjectPattern(node, opts) and t.assertObjectPattern(node, opts).

Aliases: Pattern, PatternLike, LVal

• properties: Array<RestElement | ObjectProperty> (required)
• decorators: Array<Decorator> (default: null)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null)

---

objectProperty

t.objectProperty(key, value, computed, shorthand, decorators)

See also t.isObjectProperty(node, opts) and t.assertObjectProperty(node, opts).

Aliases: UserWhitespacable, Property, ObjectMember

• key: if computed then Expression else Identifier | Literal (required)
• value: Expression | PatternLike (required)
• computed: boolean (default: false)
• shorthand: boolean (default: false)
• decorators: Array<Decorator> (default: null)

---

objectTypeAnnotation

t.objectTypeAnnotation(properties, indexers, callProperties, internalSlots, exact)

See also t.isObjectTypeAnnotation(node, opts) and t.assertObjectTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• properties: Array<ObjectTypeProperty | ObjectTypeSpreadProperty> (required)
• indexers: Array<ObjectTypeIndexer> (default: null)
• callProperties: Array<ObjectTypeCallProperty> (default: null)
• internalSlots: Array<ObjectTypeInternalSlot> (default: null)
• exact: boolean (default: false)

---

objectTypeCallProperty

t.objectTypeCallProperty(value)

See also t.isObjectTypeCallProperty(node, opts) and t.assertObjectTypeCallProperty(node, opts).

Aliases: Flow, UserWhitespacable

• value: FlowType (required)
• static: boolean (default: null)

---

objectTypeIndexer

t.objectTypeIndexer(id, key, value, variance)

See also t.isObjectTypeIndexer(node, opts) and t.assertObjectTypeIndexer(node, opts).

Aliases: Flow, UserWhitespacable

• id: Identifier (default: null)
• key: FlowType (required)
• value: FlowType (required)
• variance: Variance (default: null)
• static: boolean (default: null)

---

objectTypeInternalSlot

t.objectTypeInternalSlot(id, value, optional, static, method)

See also t.isObjectTypeInternalSlot(node, opts) and t.assertObjectTypeInternalSlot(node, opts).

Aliases: Flow, UserWhitespacable

• id: Identifier (required)
• value: FlowType (required)
• optional: boolean (required)
• static: boolean (required)
• method: boolean (required)

---

objectTypeProperty

t.objectTypeProperty(key, value, variance)

See also t.isObjectTypeProperty(node, opts) and t.assertObjectTypeProperty(node, opts).

Aliases: Flow, UserWhitespacable

• key: Identifier | StringLiteral (required)
• value: FlowType (required)
• variance: Variance (default: null)
• kind: "init" | "get" | "set" (default: null)
• optional: boolean (default: null)
• proto: boolean (default: null)
• static: boolean (default: null)

---

objectTypeSpreadProperty

t.objectTypeSpreadProperty(argument)

See also t.isObjectTypeSpreadProperty(node, opts) and t.assertObjectTypeSpreadProperty(node, opts).

Aliases: Flow, UserWhitespacable

• argument: FlowType (required)

---

opaqueType

t.opaqueType(id, typeParameters, supertype, impltype)

See also t.isOpaqueType(node, opts) and t.assertOpaqueType(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• typeParameters: TypeParameterDeclaration (default: null)
• supertype: FlowType (default: null)
• impltype: FlowType (required)

---

optionalCallExpression

t.optionalCallExpression(callee, arguments, optional)

See also t.isOptionalCallExpression(node, opts) and t.assertOptionalCallExpression(node, opts).

Aliases: Expression

• callee: Expression (required)
• arguments: Array<Expression | SpreadElement | JSXNamespacedName> (required)
• optional: boolean (required)
• typeArguments: TypeParameterInstantiation (default: null)
• typeParameters: TSTypeParameterInstantiation (default: null)

---

optionalMemberExpression

t.optionalMemberExpression(object, property, computed, optional)

See also t.isOptionalMemberExpression(node, opts) and t.assertOptionalMemberExpression(node, opts).

Aliases: Expression

• object: Expression (required)
• property: any (required)
• computed: boolean (default: false)
• optional: boolean (required)

---

parenthesizedExpression

t.parenthesizedExpression(expression)

See also t.isParenthesizedExpression(node, opts) and t.assertParenthesizedExpression(node, opts).

Aliases: Expression, ExpressionWrapper

• expression: Expression (required)

---

privateName

t.privateName(id)

See also t.isPrivateName(node, opts) and t.assertPrivateName(node, opts).

Aliases: Private

• id: Identifier (required)

---

program

t.program(body, directives, sourceType, interpreter)

See also t.isProgram(node, opts) and t.assertProgram(node, opts).

Aliases: Scopable, BlockParent, Block

• body: Array<Statement> (required)
• directives: Array<Directive> (default: [])
• sourceType: "script" | "module" (default: 'script')
• interpreter: InterpreterDirective (default: null)
• sourceFile: string (default: null)

---

qualifiedTypeIdentifier

t.qualifiedTypeIdentifier(id, qualification)

See also t.isQualifiedTypeIdentifier(node, opts) and t.assertQualifiedTypeIdentifier(node, opts).

Aliases: Flow

• id: Identifier (required)
• qualification: Identifier | QualifiedTypeIdentifier (required)

---

regExpLiteral

t.regExpLiteral(pattern, flags)

See also t.isRegExpLiteral(node, opts) and t.assertRegExpLiteral(node, opts).

Aliases: Expression, Literal

• pattern: string (required)
• flags: string (default: '')

---

restElement

t.restElement(argument)

See also t.isRestElement(node, opts) and t.assertRestElement(node, opts).

Aliases: LVal, PatternLike

• argument: LVal (required)
• decorators: Array<Decorator> (default: null)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null)

---

returnStatement

t.returnStatement(argument)

See also t.isReturnStatement(node, opts) and t.assertReturnStatement(node, opts).

Aliases: Statement, Terminatorless, CompletionStatement

• argument: Expression (default: null)

---

sequenceExpression

t.sequenceExpression(expressions)

See also t.isSequenceExpression(node, opts) and t.assertSequenceExpression(node, opts).

Aliases: Expression

• expressions: Array<Expression> (required)

---

spreadElement

t.spreadElement(argument)

See also t.isSpreadElement(node, opts) and t.assertSpreadElement(node, opts).

Aliases: UnaryLike

• argument: Expression (required)

---

stringLiteral

t.stringLiteral(value)

See also t.isStringLiteral(node, opts) and t.assertStringLiteral(node, opts).

Aliases: Expression, Pureish, Literal, Immutable

• value: string (required)

---

stringLiteralTypeAnnotation

t.stringLiteralTypeAnnotation(value)

See also t.isStringLiteralTypeAnnotation(node, opts) and t.assertStringLiteralTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• value: string (required)

---

stringTypeAnnotation

t.stringTypeAnnotation()

See also t.isStringTypeAnnotation(node, opts) and t.assertStringTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

---

super

t.super()

See also t.isSuper(node, opts) and t.assertSuper(node, opts).

Aliases: Expression

---

switchCase

t.switchCase(test, consequent)

See also t.isSwitchCase(node, opts) and t.assertSwitchCase(node, opts).

• test: Expression (default: null)
• consequent: Array<Statement> (required)

---

switchStatement

t.switchStatement(discriminant, cases)

See also t.isSwitchStatement(node, opts) and t.assertSwitchStatement(node, opts).

Aliases: Statement, BlockParent, Scopable

• discriminant: Expression (required)
• cases: Array<SwitchCase> (required)

---

tSAnyKeyword

t.tsAnyKeyword()

See also t.isTSAnyKeyword(node, opts) and t.assertTSAnyKeyword(node, opts).

Aliases: TSType

---

tSArrayType

t.tsArrayType(elementType)

See also t.isTSArrayType(node, opts) and t.assertTSArrayType(node, opts).

Aliases: TSType

• elementType: TSType (required)

---

tSAsExpression

t.tsAsExpression(expression, typeAnnotation)

See also t.isTSAsExpression(node, opts) and t.assertTSAsExpression(node, opts).

Aliases: Expression

• expression: Expression (required)
• typeAnnotation: TSType (required)

---

tSBooleanKeyword

t.tsBooleanKeyword()

See also t.isTSBooleanKeyword(node, opts) and t.assertTSBooleanKeyword(node, opts).

Aliases: TSType

---

tSCallSignatureDeclaration

t.tsCallSignatureDeclaration(typeParameters, parameters, typeAnnotation)

See also t.isTSCallSignatureDeclaration(node, opts) and t.assertTSCallSignatureDeclaration(node, opts).

Aliases: TSTypeElement

• typeParameters: TSTypeParameterDeclaration (default: null)
• parameters: Array<Identifier | RestElement> (default: null)
• typeAnnotation: TSTypeAnnotation (default: null)

---

tSConditionalType

t.tsConditionalType(checkType, extendsType, trueType, falseType)

See also t.isTSConditionalType(node, opts) and t.assertTSConditionalType(node, opts).

Aliases: TSType

• checkType: TSType (required)
• extendsType: TSType (required)
• trueType: TSType (required)
• falseType: TSType (required)

---

tSConstructSignatureDeclaration

t.tsConstructSignatureDeclaration(typeParameters, parameters, typeAnnotation)

See also t.isTSConstructSignatureDeclaration(node, opts) and t.assertTSConstructSignatureDeclaration(node, opts).

Aliases: TSTypeElement

• typeParameters: TSTypeParameterDeclaration (default: null)
• parameters: Array<Identifier | RestElement> (default: null)
• typeAnnotation: TSTypeAnnotation (default: null)

---

tSConstructorType

t.tsConstructorType(typeParameters, typeAnnotation)

See also t.isTSConstructorType(node, opts) and t.assertTSConstructorType(node, opts).

Aliases: TSType

• typeParameters: TSTypeParameterDeclaration (default: null)
• typeAnnotation: TSTypeAnnotation (default: null)
• parameters: Array<Identifier | RestElement> (default: null)

---

tSDeclareFunction

t.tsDeclareFunction(id, typeParameters, params, returnType)

See also t.isTSDeclareFunction(node, opts) and t.assertTSDeclareFunction(node, opts).

Aliases: Statement, Declaration

• id: Identifier (default: null)
• typeParameters: TSTypeParameterDeclaration | Noop (default: null)
• params: Array<LVal> (required)
• returnType: TSTypeAnnotation | Noop (default: null)
• async: boolean (default: false)
• declare: boolean (default: null)
• generator: boolean (default: false)

---

tSDeclareMethod

t.tsDeclareMethod(decorators, key, typeParameters, params, returnType)

See also t.isTSDeclareMethod(node, opts) and t.assertTSDeclareMethod(node, opts).

• decorators: Array<Decorator> (default: null)
• key: Identifier | StringLiteral | NumericLiteral | Expression (required)
• typeParameters: TSTypeParameterDeclaration | Noop (default: null)
• params: Array<LVal> (required)
• returnType: TSTypeAnnotation | Noop (default: null)
• abstract: boolean (default: null)
• access: "public" | "private" | "protected" (default: null)
• accessibility: "public" | "private" | "protected" (default: null)
• async: boolean (default: false)
• computed: boolean (default: false)
• generator: boolean (default: false)
• kind: "get" | "set" | "method" | "constructor" (default: 'method')
• optional: boolean (default: null)
• static: boolean (default: null)

---

tSEnumDeclaration

t.tsEnumDeclaration(id, members)

See also t.isTSEnumDeclaration(node, opts) and t.assertTSEnumDeclaration(node, opts).

Aliases: Statement, Declaration

• id: Identifier (required)
• members: Array<TSEnumMember> (required)
• const: boolean (default: null)
• declare: boolean (default: null)
• initializer: Expression (default: null)

---

tSEnumMember

t.tsEnumMember(id, initializer)

See also t.isTSEnumMember(node, opts) and t.assertTSEnumMember(node, opts).

• id: Identifier | StringLiteral (required)
• initializer: Expression (default: null)

---

tSExportAssignment

t.tsExportAssignment(expression)

See also t.isTSExportAssignment(node, opts) and t.assertTSExportAssignment(node, opts).

Aliases: Statement

• expression: Expression (required)

---

tSExpressionWithTypeArguments

t.tsExpressionWithTypeArguments(expression, typeParameters)

See also t.isTSExpressionWithTypeArguments(node, opts) and t.assertTSExpressionWithTypeArguments(node, opts).

Aliases: TSType

• expression: TSEntityName (required)
• typeParameters: TSTypeParameterInstantiation (default: null)

---

tSExternalModuleReference

t.tsExternalModuleReference(expression)

See also t.isTSExternalModuleReference(node, opts) and t.assertTSExternalModuleReference(node, opts).

• expression: StringLiteral (required)

---

tSFunctionType

t.tsFunctionType(typeParameters, typeAnnotation)

See also t.isTSFunctionType(node, opts) and t.assertTSFunctionType(node, opts).

Aliases: TSType

• typeParameters: TSTypeParameterDeclaration (default: null)
• typeAnnotation: TSTypeAnnotation (default: null)
• parameters: Array<Identifier | RestElement> (default: null)

---

tSImportEqualsDeclaration

t.tsImportEqualsDeclaration(id, moduleReference)

See also t.isTSImportEqualsDeclaration(node, opts) and t.assertTSImportEqualsDeclaration(node, opts).

Aliases: Statement

• id: Identifier (required)
• moduleReference: TSEntityName | TSExternalModuleReference (required)
• isExport: boolean (default: null)

---

tSIndexSignature

t.tsIndexSignature(parameters, typeAnnotation)

See also t.isTSIndexSignature(node, opts) and t.assertTSIndexSignature(node, opts).

Aliases: TSTypeElement

• parameters: Array<Identifier> (required)
• typeAnnotation: TSTypeAnnotation (default: null)
• readonly: boolean (default: null)

---

tSIndexedAccessType

t.tsIndexedAccessType(objectType, indexType)

See also t.isTSIndexedAccessType(node, opts) and t.assertTSIndexedAccessType(node, opts).

Aliases: TSType

• objectType: TSType (required)
• indexType: TSType (required)

---

tSInferType

t.tsInferType(typeParameter)

See also t.isTSInferType(node, opts) and t.assertTSInferType(node, opts).

Aliases: TSType

• typeParameter: TSTypeParameter (required)

---

tSInterfaceBody

t.tsInterfaceBody(body)

See also t.isTSInterfaceBody(node, opts) and t.assertTSInterfaceBody(node, opts).

• body: Array<TSTypeElement> (required)

---

tSInterfaceDeclaration

t.tsInterfaceDeclaration(id, typeParameters, extends, body)

See also t.isTSInterfaceDeclaration(node, opts) and t.assertTSInterfaceDeclaration(node, opts).

Aliases: Statement, Declaration

• id: Identifier (required)
• typeParameters: TSTypeParameterDeclaration (default: null)
• extends: Array<TSExpressionWithTypeArguments> (default: null)
• body: TSInterfaceBody (required)
• declare: boolean (default: null)

---

tSIntersectionType

t.tsIntersectionType(types)

See also t.isTSIntersectionType(node, opts) and t.assertTSIntersectionType(node, opts).

Aliases: TSType

• types: Array<TSType> (required)

---

tSLiteralType

t.tsLiteralType(literal)

See also t.isTSLiteralType(node, opts) and t.assertTSLiteralType(node, opts).

Aliases: TSType

• literal: NumericLiteral | StringLiteral | BooleanLiteral (required)

---

tSMappedType

t.tsMappedType(typeParameter, typeAnnotation)

See also t.isTSMappedType(node, opts) and t.assertTSMappedType(node, opts).

Aliases: TSType

• typeParameter: TSTypeParameter (required)
• typeAnnotation: TSType (default: null)
• optional: boolean (default: null)
• readonly: boolean (default: null)

---

tSMethodSignature

t.tsMethodSignature(key, typeParameters, parameters, typeAnnotation)

See also t.isTSMethodSignature(node, opts) and t.assertTSMethodSignature(node, opts).

Aliases: TSTypeElement

• key: Expression (required)
• typeParameters: TSTypeParameterDeclaration (default: null)
• parameters: Array<Identifier | RestElement> (default: null)
• typeAnnotation: TSTypeAnnotation (default: null)
• computed: boolean (default: null)
• optional: boolean (default: null)

---

tSModuleBlock

t.tsModuleBlock(body)

See also t.isTSModuleBlock(node, opts) and t.assertTSModuleBlock(node, opts).

• body: Array<Statement> (required)

---

tSModuleDeclaration

t.tsModuleDeclaration(id, body)

See also t.isTSModuleDeclaration(node, opts) and t.assertTSModuleDeclaration(node, opts).

Aliases: Statement, Declaration

• id: Identifier | StringLiteral (required)
• body: TSModuleBlock | TSModuleDeclaration (required)
• declare: boolean (default: null)
• global: boolean (default: null)

---

tSNamespaceExportDeclaration

t.tsNamespaceExportDeclaration(id)

See also t.isTSNamespaceExportDeclaration(node, opts) and t.assertTSNamespaceExportDeclaration(node, opts).

Aliases: Statement

• id: Identifier (required)

---

tSNeverKeyword

t.tsNeverKeyword()

See also t.isTSNeverKeyword(node, opts) and t.assertTSNeverKeyword(node, opts).

Aliases: TSType

---

tSNonNullExpression

t.tsNonNullExpression(expression)

See also t.isTSNonNullExpression(node, opts) and t.assertTSNonNullExpression(node, opts).

Aliases: Expression

• expression: Expression (required)

---

tSNullKeyword

t.tsNullKeyword()

See also t.isTSNullKeyword(node, opts) and t.assertTSNullKeyword(node, opts).

Aliases: TSType

---

tSNumberKeyword

t.tsNumberKeyword()

See also t.isTSNumberKeyword(node, opts) and t.assertTSNumberKeyword(node, opts).

Aliases: TSType

---

tSObjectKeyword

t.tsObjectKeyword()

See also t.isTSObjectKeyword(node, opts) and t.assertTSObjectKeyword(node, opts).

Aliases: TSType

---

tSParameterProperty

t.tsParameterProperty(parameter)

See also t.isTSParameterProperty(node, opts) and t.assertTSParameterProperty(node, opts).

Aliases: LVal

• parameter: Identifier | AssignmentPattern (required)
• accessibility: "public" | "private" | "protected" (default: null)
• readonly: boolean (default: null)

---

tSParenthesizedType

t.tsParenthesizedType(typeAnnotation)

See also t.isTSParenthesizedType(node, opts) and t.assertTSParenthesizedType(node, opts).

Aliases: TSType

• typeAnnotation: TSType (required)

---

tSPropertySignature

t.tsPropertySignature(key, typeAnnotation, initializer)

See also t.isTSPropertySignature(node, opts) and t.assertTSPropertySignature(node, opts).

Aliases: TSTypeElement

• key: Expression (required)
• typeAnnotation: TSTypeAnnotation (default: null)
• initializer: Expression (default: null)
• computed: boolean (default: null)
• optional: boolean (default: null)
• readonly: boolean (default: null)

---

tSQualifiedName

t.tsQualifiedName(left, right)

See also t.isTSQualifiedName(node, opts) and t.assertTSQualifiedName(node, opts).

Aliases: TSEntityName

• left: TSEntityName (required)
• right: Identifier (required)

---

tSStringKeyword

t.tsStringKeyword()

See also t.isTSStringKeyword(node, opts) and t.assertTSStringKeyword(node, opts).

Aliases: TSType

---

tSSymbolKeyword

t.tsSymbolKeyword()

See also t.isTSSymbolKeyword(node, opts) and t.assertTSSymbolKeyword(node, opts).

Aliases: TSType

---

tSThisType

t.tsThisType()

See also t.isTSThisType(node, opts) and t.assertTSThisType(node, opts).

Aliases: TSType

---

tSTupleType

t.tsTupleType(elementTypes)

See also t.isTSTupleType(node, opts) and t.assertTSTupleType(node, opts).

Aliases: TSType

• elementTypes: Array<TSType> (required)

---

tSTypeAliasDeclaration

t.tsTypeAliasDeclaration(id, typeParameters, typeAnnotation)

See also t.isTSTypeAliasDeclaration(node, opts) and t.assertTSTypeAliasDeclaration(node, opts).

Aliases: Statement, Declaration

• id: Identifier (required)
• typeParameters: TSTypeParameterDeclaration (default: null)
• typeAnnotation: TSType (required)
• declare: boolean (default: null)

---

tSTypeAnnotation

t.tsTypeAnnotation(typeAnnotation)

See also t.isTSTypeAnnotation(node, opts) and t.assertTSTypeAnnotation(node, opts).

• typeAnnotation: TSType (required)

---

tSTypeAssertion

t.tsTypeAssertion(typeAnnotation, expression)

See also t.isTSTypeAssertion(node, opts) and t.assertTSTypeAssertion(node, opts).

Aliases: Expression

• typeAnnotation: TSType (required)
• expression: Expression (required)

---

tSTypeLiteral

t.tsTypeLiteral(members)

See also t.isTSTypeLiteral(node, opts) and t.assertTSTypeLiteral(node, opts).

Aliases: TSType

• members: Array<TSTypeElement> (required)

---

tSTypeOperator

t.tsTypeOperator(typeAnnotation)

See also t.isTSTypeOperator(node, opts) and t.assertTSTypeOperator(node, opts).

Aliases: TSType

• typeAnnotation: TSType (required)
• operator: string (default: null)

---

tSTypeParameter

t.tsTypeParameter(constraint, default)

See also t.isTSTypeParameter(node, opts) and t.assertTSTypeParameter(node, opts).

• constraint: TSType (default: null)
• default: TSType (default: null)
• name: string (default: null)

---

tSTypeParameterDeclaration

t.tsTypeParameterDeclaration(params)

See also t.isTSTypeParameterDeclaration(node, opts) and t.assertTSTypeParameterDeclaration(node, opts).

• params: Array<TSTypeParameter> (required)

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tSTypeParameterInstantiation

t.tsTypeParameterInstantiation(params)

See also t.isTSTypeParameterInstantiation(node, opts) and t.assertTSTypeParameterInstantiation(node, opts).

• params: Array<TSType> (required)

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tSTypePredicate

t.tsTypePredicate(parameterName, typeAnnotation)

See also t.isTSTypePredicate(node, opts) and t.assertTSTypePredicate(node, opts).

Aliases: TSType

• parameterName: Identifier | TSThisType (required)
• typeAnnotation: TSTypeAnnotation (required)

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tSTypeQuery

t.tsTypeQuery(exprName)

See also t.isTSTypeQuery(node, opts) and t.assertTSTypeQuery(node, opts).

Aliases: TSType

• exprName: TSEntityName (required)

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tSTypeReference

t.tsTypeReference(typeName, typeParameters)

See also t.isTSTypeReference(node, opts) and t.assertTSTypeReference(node, opts).

Aliases: TSType

• typeName: TSEntityName (required)
• typeParameters: TSTypeParameterInstantiation (default: null)

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tSUndefinedKeyword

t.tsUndefinedKeyword()

See also t.isTSUndefinedKeyword(node, opts) and t.assertTSUndefinedKeyword(node, opts).

Aliases: TSType

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tSUnionType

t.tsUnionType(types)

See also t.isTSUnionType(node, opts) and t.assertTSUnionType(node, opts).

Aliases: TSType

• types: Array<TSType> (required)

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tSUnknownType

t.tsUnknownType(types)

See also t.isTSUnknownType(node, opts) and t.assertTSUnknownType(node, opts).

Aliases: TSType

• types: Array<TSType> (required)

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tSVoidKeyword

t.tsVoidKeyword()

See also t.isTSVoidKeyword(node, opts) and t.assertTSVoidKeyword(node, opts).

Aliases: TSType

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taggedTemplateExpression

t.taggedTemplateExpression(tag, quasi)

See also t.isTaggedTemplateExpression(node, opts) and t.assertTaggedTemplateExpression(node, opts).

Aliases: Expression

• tag: Expression (required)
• quasi: TemplateLiteral (required)

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templateElement

t.templateElement(value, tail)

See also t.isTemplateElement(node, opts) and t.assertTemplateElement(node, opts).

• value (required)
• tail: boolean (default: false)

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templateLiteral

t.templateLiteral(quasis, expressions)

See also t.isTemplateLiteral(node, opts) and t.assertTemplateLiteral(node, opts).

Aliases: Expression, Literal

• quasis: Array<TemplateElement> (required)
• expressions: Array<Expression> (required)

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thisExpression

t.thisExpression()

See also t.isThisExpression(node, opts) and t.assertThisExpression(node, opts).

Aliases: Expression

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thisTypeAnnotation

t.thisTypeAnnotation()

See also t.isThisTypeAnnotation(node, opts) and t.assertThisTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

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throwStatement

t.throwStatement(argument)

See also t.isThrowStatement(node, opts) and t.assertThrowStatement(node, opts).

Aliases: Statement, Terminatorless, CompletionStatement

• argument: Expression (required)

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tryStatement

t.tryStatement(block, handler, finalizer)

See also t.isTryStatement(node, opts) and t.assertTryStatement(node, opts).

Aliases: Statement

• block: BlockStatement (required)
• handler: CatchClause (default: null)
• finalizer: BlockStatement (default: null)

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tupleTypeAnnotation

t.tupleTypeAnnotation(types)

See also t.isTupleTypeAnnotation(node, opts) and t.assertTupleTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• types: Array<FlowType> (required)

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typeAlias

t.typeAlias(id, typeParameters, right)

See also t.isTypeAlias(node, opts) and t.assertTypeAlias(node, opts).

Aliases: Flow, FlowDeclaration, Statement, Declaration

• id: Identifier (required)
• typeParameters: TypeParameterDeclaration (default: null)
• right: FlowType (required)

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typeAnnotation

t.typeAnnotation(typeAnnotation)

See also t.isTypeAnnotation(node, opts) and t.assertTypeAnnotation(node, opts).

Aliases: Flow

• typeAnnotation: FlowType (required)

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typeCastExpression

t.typeCastExpression(expression, typeAnnotation)

See also t.isTypeCastExpression(node, opts) and t.assertTypeCastExpression(node, opts).

Aliases: Flow, ExpressionWrapper, Expression

• expression: Expression (required)
• typeAnnotation: TypeAnnotation (required)

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typeParameter

t.typeParameter(bound, default, variance)

See also t.isTypeParameter(node, opts) and t.assertTypeParameter(node, opts).

Aliases: Flow

• bound: TypeAnnotation (default: null)
• default: FlowType (default: null)
• variance: Variance (default: null)
• name: string (default: null)

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typeParameterDeclaration

t.typeParameterDeclaration(params)

See also t.isTypeParameterDeclaration(node, opts) and t.assertTypeParameterDeclaration(node, opts).

Aliases: Flow

• params: Array<TypeParameter> (required)

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typeParameterInstantiation

t.typeParameterInstantiation(params)

See also t.isTypeParameterInstantiation(node, opts) and t.assertTypeParameterInstantiation(node, opts).

Aliases: Flow

• params: Array<FlowType> (required)

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typeofTypeAnnotation

t.typeofTypeAnnotation(argument)

See also t.isTypeofTypeAnnotation(node, opts) and t.assertTypeofTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• argument: FlowType (required)

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unaryExpression

t.unaryExpression(operator, argument, prefix)

See also t.isUnaryExpression(node, opts) and t.assertUnaryExpression(node, opts).

Aliases: UnaryLike, Expression

• operator: "void" | "throw" | "delete" | "!" | "+" | "-" | "~" | "typeof" (required)
• argument: Expression (required)
• prefix: boolean (default: true)

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unionTypeAnnotation

t.unionTypeAnnotation(types)

See also t.isUnionTypeAnnotation(node, opts) and t.assertUnionTypeAnnotation(node, opts).

Aliases: Flow, FlowType

• types: Array<FlowType> (required)

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updateExpression

t.updateExpression(operator, argument, prefix)

See also t.isUpdateExpression(node, opts) and t.assertUpdateExpression(node, opts).

Aliases: Expression

• operator: "++" | "--" (required)
• argument: Expression (required)
• prefix: boolean (default: false)

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variableDeclaration

t.variableDeclaration(kind, declarations)

See also t.isVariableDeclaration(node, opts) and t.assertVariableDeclaration(node, opts).

Aliases: Statement, Declaration

• kind: "var" | "let" | "const" (required)
• declarations: Array<VariableDeclarator> (required)
• declare: boolean (default: null)

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variableDeclarator

t.variableDeclarator(id, init)

See also t.isVariableDeclarator(node, opts) and t.assertVariableDeclarator(node, opts).

• id: LVal (required)
• init: Expression (default: null)
• definite: boolean (default: null)

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variance

t.variance(kind)

See also t.isVariance(node, opts) and t.assertVariance(node, opts).

Aliases: Flow

• kind: "minus" | "plus" (required)

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voidTypeAnnotation

t.voidTypeAnnotation()

See also t.isVoidTypeAnnotation(node, opts) and t.assertVoidTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

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whileStatement

t.whileStatement(test, body)

See also t.isWhileStatement(node, opts) and t.assertWhileStatement(node, opts).

Aliases: Statement, BlockParent, Loop, While, Scopable

• test: Expression (required)
• body: BlockStatement | Statement (required)

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withStatement

t.withStatement(object, body)

See also t.isWithStatement(node, opts) and t.assertWithStatement(node, opts).

Aliases: Statement

• object: Expression (required)
• body: BlockStatement | Statement (required)

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yieldExpression

t.yieldExpression(argument, delegate)

See also t.isYieldExpression(node, opts) and t.assertYieldExpression(node, opts).

Aliases: Expression, Terminatorless

• argument: Expression (default: null)
• delegate: boolean (default: false)

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