@babel/types

This module contains methods for building ASTs manually and for checking the types of AST nodes.

Install

npm install --save-dev @babel/types

API

Node Builders

anyTypeAnnotation

t.anyTypeAnnotation();

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

Aliases: Flow, FlowType, FlowBaseAnnotation

argumentPlaceholder

t.argumentPlaceholder();

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

Aliases: Proposal, StandardizedOrProposal

arrayExpression

t.arrayExpression(elements);

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

AST Node ArrayExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression

arrayPattern

t.arrayPattern(elements);

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

AST Node ArrayPattern shape:

• elements: Array<null | PatternLike> (required)
• decorators: Array<Decorator> (default: null, excluded from builder function)
• optional: boolean (default: null, excluded from builder function)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Pattern, PatternLike, LVal

arrayTypeAnnotation

t.arrayTypeAnnotation(elementType);

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

AST Node ArrayTypeAnnotation shape:

• elementType: FlowType (required)

Aliases: Flow, FlowType

arrowFunctionExpression

t.arrowFunctionExpression(params, body, async);

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

AST Node ArrowFunctionExpression shape:

• params: Array<Identifier | Pattern | RestElement> (required)
• body: BlockStatement | Expression (required)
• async: boolean (default: false)
• expression: boolean (required)
• generator: boolean (default: false, excluded from builder function)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null, excluded from builder function)

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

assignmentExpression

t.assignmentExpression(operator, left, right);

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

AST Node AssignmentExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression

assignmentPattern

t.assignmentPattern(left, right);

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

AST Node AssignmentPattern shape:

• left: Identifier | ObjectPattern | ArrayPattern | MemberExpression (required)
• right: Expression (required)
• decorators: Array<Decorator> (default: null, excluded from builder function)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Pattern, PatternLike, LVal

awaitExpression

t.awaitExpression(argument);

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

AST Node AwaitExpression shape:

• argument: Expression (required)

Aliases: Standardized, StandardizedOrProposal, Expression, Terminatorless

bigIntLiteral

t.bigIntLiteral(value);

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

AST Node BigIntLiteral shape:

• value: string (required)

Aliases: Standardized, StandardizedOrProposal, Expression, Pureish, Literal, Immutable

binaryExpression

t.binaryExpression(operator, left, right);

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

AST Node BinaryExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Binary, Expression

bindExpression

t.bindExpression(object, callee);

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

AST Node BindExpression shape:

• object: Expression (required)
• callee: Expression (required)

Aliases: Proposal, StandardizedOrProposal, Expression

blockStatement

t.blockStatement(body, directives);

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

AST Node BlockStatement shape:

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

Aliases: Standardized, StandardizedOrProposal, Scopable, BlockParent, Block, Statement

booleanLiteral

t.booleanLiteral(value);

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

AST Node BooleanLiteral shape:

• value: boolean (required)

Aliases: Standardized, StandardizedOrProposal, Expression, Pureish, Literal, Immutable

booleanLiteralTypeAnnotation

t.booleanLiteralTypeAnnotation(value);

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

AST Node BooleanLiteralTypeAnnotation shape:

• value: boolean (required)

Aliases: Flow, FlowType

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).

AST Node BreakStatement shape:

• label: Identifier (default: null)

Aliases: Standardized, StandardizedOrProposal, Statement, Terminatorless, CompletionStatement

callExpression

t.callExpression(callee, arguments);

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

AST Node CallExpression shape:

• callee: Expression | V8IntrinsicIdentifier (required)
• arguments: Array<Expression | SpreadElement | JSXNamespacedName | ArgumentPlaceholder> (required)
• optional: true | false (default: null, excluded from builder function)
• typeArguments: TypeParameterInstantiation (default: null, excluded from builder function)
• typeParameters: TSTypeParameterInstantiation (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Expression

catchClause

t.catchClause(param, body);

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

AST Node CatchClause shape:

• param: Identifier | ArrayPattern | ObjectPattern (default: null)
• body: BlockStatement (required)

Aliases: Standardized, StandardizedOrProposal, Scopable, BlockParent

classBody

t.classBody(body);

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

AST Node ClassBody shape:

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

Aliases: Standardized, StandardizedOrProposal

classDeclaration

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

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

AST Node ClassDeclaration shape:

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

Aliases: Standardized, StandardizedOrProposal, Scopable, Class, Statement, Declaration

classExpression

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

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

AST Node ClassExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Scopable, Class, Expression

classImplements

t.classImplements(id, typeParameters);

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

AST Node ClassImplements shape:

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

Aliases: Flow

classMethod

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

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

AST Node ClassMethod shape:

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

Aliases: Standardized, StandardizedOrProposal, Function, Scopable, BlockParent, FunctionParent, Method

classPrivateMethod

t.classPrivateMethod(kind, key, params, body, static);

See also t.isClassPrivateMethod(node, opts) and t.assertClassPrivateMethod(node, opts).

AST Node ClassPrivateMethod shape:

• kind: "get" | "set" | "method" | "constructor" (default: 'method')
• key: PrivateName (required)
• params: Array<Identifier | Pattern | RestElement | TSParameterProperty> (required)
• body: BlockStatement (required)
• static: boolean (default: false)
• abstract: boolean (default: null, excluded from builder function)
• access: "public" | "private" | "protected" (default: null, excluded from builder function)
• accessibility: "public" | "private" | "protected" (default: null, excluded from builder function)
• async: boolean (default: false, excluded from builder function)
• computed: ‘false’ (default: false, excluded from builder function)
• decorators: Array<Decorator> (default: null, excluded from builder function)
• generator: boolean (default: false, excluded from builder function)
• optional: boolean (default: null, excluded from builder function)
• override: boolean (default: false, excluded from builder function)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Function, Scopable, BlockParent, FunctionParent, Method, Private

classPrivateProperty

t.classPrivateProperty(key, value, decorators, static);

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

AST Node ClassPrivateProperty shape:

• key: PrivateName (required)
• value: Expression (default: null)
• decorators: Array<Decorator> (default: null)
• static (required)
• definite: boolean (default: null, excluded from builder function)
• readonly: boolean (default: null, excluded from builder function)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)
• variance: Variance (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Property, Private

classProperty

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

History

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

AST Node ClassProperty shape:

• 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)
• static: boolean (default: false)
• abstract: boolean (default: null, excluded from builder function)
• accessibility: "public" | "private" | "protected" (default: null, excluded from builder function)
• declare: boolean (default: null, excluded from builder function)
• definite: boolean (default: null, excluded from builder function)
• optional: boolean (default: null, excluded from builder function)
• override: boolean (default: false, excluded from builder function)
• readonly: boolean (default: null, excluded from builder function)
• variance: Variance (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Property

conditionalExpression

t.conditionalExpression(test, consequent, alternate);

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

AST Node ConditionalExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression, Conditional

continueStatement

t.continueStatement(label);

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

AST Node ContinueStatement shape:

• label: Identifier (default: null)

Aliases: Standardized, StandardizedOrProposal, Statement, Terminatorless, CompletionStatement

debuggerStatement

t.debuggerStatement();

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

Aliases: Standardized, StandardizedOrProposal, Statement

decimalLiteral

t.decimalLiteral(value);

See also t.isDecimalLiteral(node, opts) and t.assertDecimalLiteral(node, opts).

AST Node DecimalLiteral shape:

• value: string (required)

Aliases: Proposal, StandardizedOrProposal, Expression, Pureish, Literal, Immutable

declareClass

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

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

AST Node DeclareClass shape:

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareExportAllDeclaration

t.declareExportAllDeclaration(source);

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

AST Node DeclareExportAllDeclaration shape:

• source: StringLiteral (required)
• exportKind: "type" | "value" (default: null, excluded from builder function)

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareExportDeclaration

t.declareExportDeclaration(declaration, specifiers, source);

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

AST Node DeclareExportDeclaration shape:

• declaration: Flow (default: null)
• specifiers: Array<ExportSpecifier | ExportNamespaceSpecifier> (default: null)
• source: StringLiteral (default: null)
• default: boolean (default: null, excluded from builder function)

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareFunction

t.declareFunction(id);

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

AST Node DeclareFunction shape:

• id: Identifier (required)
• predicate: DeclaredPredicate (default: null, excluded from builder function)

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareInterface

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

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

AST Node DeclareInterface shape:

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareModule

t.declareModule(id, body, kind);

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

AST Node DeclareModule shape:

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareModuleExports

t.declareModuleExports(typeAnnotation);

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

AST Node DeclareModuleExports shape:

• typeAnnotation: TypeAnnotation (required)

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareOpaqueType

t.declareOpaqueType(id, typeParameters, supertype);

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

AST Node DeclareOpaqueType shape:

• id: Identifier (required)
• typeParameters: TypeParameterDeclaration (default: null)
• supertype: FlowType (default: null)
• impltype: FlowType (default: null, excluded from builder function)

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareTypeAlias

t.declareTypeAlias(id, typeParameters, right);

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

AST Node DeclareTypeAlias shape:

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

declareVariable

t.declareVariable(id);

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

AST Node DeclareVariable shape:

• id: Identifier (required)

Aliases: Flow, FlowDeclaration, Statement, Declaration

declaredPredicate

t.declaredPredicate(value);

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

AST Node DeclaredPredicate shape:

• value: Flow (required)

Aliases: Flow, FlowPredicate

decorator

t.decorator(expression);

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

AST Node Decorator shape:

• expression: Expression (required)

Aliases: Proposal, StandardizedOrProposal

directive

t.directive(value);

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

AST Node Directive shape:

• value: DirectiveLiteral (required)

Aliases: Standardized, StandardizedOrProposal

directiveLiteral

t.directiveLiteral(value);

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

AST Node DirectiveLiteral shape:

• value: string (required)

Aliases: Standardized, StandardizedOrProposal

doExpression

t.doExpression(body, async);

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

AST Node DoExpression shape:

• body: BlockStatement (required)
• async: boolean (default: false)

Aliases: Proposal, StandardizedOrProposal, Expression

doWhileStatement

t.doWhileStatement(test, body);

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

AST Node DoWhileStatement shape:

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

Aliases: Standardized, StandardizedOrProposal, Statement, BlockParent, Loop, While, Scopable

emptyStatement

t.emptyStatement();

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

Aliases: Standardized, StandardizedOrProposal, Statement

emptyTypeAnnotation

t.emptyTypeAnnotation();

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

Aliases: Flow, FlowType, FlowBaseAnnotation

enumBooleanBody

t.enumBooleanBody(members);

See also t.isEnumBooleanBody(node, opts) and t.assertEnumBooleanBody(node, opts).

AST Node EnumBooleanBody shape:

• members: Array<EnumBooleanMember> (required)
• explicitType: boolean (required)
• hasUnknownMembers: boolean (required)

Aliases: Flow, EnumBody

enumBooleanMember

t.enumBooleanMember(id);

See also t.isEnumBooleanMember(node, opts) and t.assertEnumBooleanMember(node, opts).

AST Node EnumBooleanMember shape:

• id: Identifier (required)
• init: BooleanLiteral (required)

Aliases: Flow, EnumMember

enumDeclaration

t.enumDeclaration(id, body);

See also t.isEnumDeclaration(node, opts) and t.assertEnumDeclaration(node, opts).

AST Node EnumDeclaration shape:

• id: Identifier (required)
• body: EnumBooleanBody | EnumNumberBody | EnumStringBody | EnumSymbolBody (required)

Aliases: Flow, Statement, Declaration

enumDefaultedMember

t.enumDefaultedMember(id);

See also t.isEnumDefaultedMember(node, opts) and t.assertEnumDefaultedMember(node, opts).

AST Node EnumDefaultedMember shape:

• id: Identifier (required)

Aliases: Flow, EnumMember

enumNumberBody

t.enumNumberBody(members);

See also t.isEnumNumberBody(node, opts) and t.assertEnumNumberBody(node, opts).

AST Node EnumNumberBody shape:

• members: Array<EnumNumberMember> (required)
• explicitType: boolean (required)
• hasUnknownMembers: boolean (required)

Aliases: Flow, EnumBody

enumNumberMember

t.enumNumberMember(id, init);

See also t.isEnumNumberMember(node, opts) and t.assertEnumNumberMember(node, opts).

AST Node EnumNumberMember shape:

• id: Identifier (required)
• init: NumericLiteral (required)

Aliases: Flow, EnumMember

enumStringBody

t.enumStringBody(members);

See also t.isEnumStringBody(node, opts) and t.assertEnumStringBody(node, opts).

AST Node EnumStringBody shape:

• members: Array<EnumStringMember | EnumDefaultedMember> (required)
• explicitType: boolean (required)
• hasUnknownMembers: boolean (required)

Aliases: Flow, EnumBody

enumStringMember

t.enumStringMember(id, init);

See also t.isEnumStringMember(node, opts) and t.assertEnumStringMember(node, opts).

AST Node EnumStringMember shape:

• id: Identifier (required)
• init: StringLiteral (required)

Aliases: Flow, EnumMember

enumSymbolBody

t.enumSymbolBody(members);

See also t.isEnumSymbolBody(node, opts) and t.assertEnumSymbolBody(node, opts).

AST Node EnumSymbolBody shape:

• members: Array<EnumDefaultedMember> (required)
• hasUnknownMembers: boolean (required)

Aliases: Flow, EnumBody

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).

AST Node ExportAllDeclaration shape:

• source: StringLiteral (required)
• assertions: Array<ImportAttribute> (default: null, excluded from builder function)
• exportKind: "type" | "value" (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Statement, Declaration, ModuleDeclaration, ExportDeclaration

exportDefaultDeclaration

t.exportDefaultDeclaration(declaration);

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

AST Node ExportDefaultDeclaration shape:

• declaration: FunctionDeclaration | TSDeclareFunction | ClassDeclaration | Expression (required)
• exportKind: "value" (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Statement, Declaration, ModuleDeclaration, ExportDeclaration

exportDefaultSpecifier

t.exportDefaultSpecifier(exported);

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

AST Node ExportDefaultSpecifier shape:

• exported: Identifier (required)

Aliases: Proposal, StandardizedOrProposal, ModuleSpecifier

exportNamedDeclaration

t.exportNamedDeclaration(declaration, specifiers, source);

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

AST Node ExportNamedDeclaration shape:

• declaration: Declaration (default: null)
• specifiers: Array<ExportSpecifier | ExportDefaultSpecifier | ExportNamespaceSpecifier> (default: [])
• source: StringLiteral (default: null)
• assertions: Array<ImportAttribute> (default: null, excluded from builder function)
• exportKind: "type" | "value" (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Statement, Declaration, ModuleDeclaration, ExportDeclaration

exportNamespaceSpecifier

t.exportNamespaceSpecifier(exported);

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

AST Node ExportNamespaceSpecifier shape:

• exported: Identifier (required)

Aliases: Standardized, StandardizedOrProposal, ModuleSpecifier

exportSpecifier

t.exportSpecifier(local, exported);

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

AST Node ExportSpecifier shape:

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

Aliases: Standardized, StandardizedOrProposal, ModuleSpecifier

expressionStatement

t.expressionStatement(expression);

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

AST Node ExpressionStatement shape:

• expression: Expression (required)

Aliases: Standardized, StandardizedOrProposal, Statement, ExpressionWrapper

file

t.file(program, comments, tokens);

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

AST Node File shape:

• program: Program (required)
• comments: Array<CommentBlock | CommentLine> (default: null)
• tokens: Array<any> (default: null)

Aliases: Standardized, StandardizedOrProposal

forInStatement

t.forInStatement(left, right, body);

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

AST Node ForInStatement shape:

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

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

forOfStatement

t.forOfStatement(left, right, body, await);

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

AST Node ForOfStatement shape:

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

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

forStatement

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

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

AST Node ForStatement shape:

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

Aliases: Standardized, StandardizedOrProposal, Scopable, Statement, For, BlockParent, Loop

functionDeclaration

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

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

AST Node FunctionDeclaration shape:

• id: Identifier (default: null)
• params: Array<Identifier | Pattern | RestElement> (required)
• body: BlockStatement (required)
• generator: boolean (default: false)
• async: boolean (default: false)
• declare: boolean (default: null, excluded from builder function)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null, excluded from builder function)

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

functionExpression

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

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

AST Node FunctionExpression shape:

• id: Identifier (default: null)
• params: Array<Identifier | Pattern | RestElement> (required)
• body: BlockStatement (required)
• generator: boolean (default: false)
• async: boolean (default: false)
• returnType: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)
• typeParameters: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop (default: null, excluded from builder function)

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

functionTypeAnnotation

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

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

AST Node FunctionTypeAnnotation shape:

• typeParameters: TypeParameterDeclaration (default: null)
• params: Array<FunctionTypeParam> (required)
• rest: FunctionTypeParam (default: null)
• returnType: FlowType (required)
• this: FunctionTypeParam (default: null, excluded from builder function)

Aliases: Flow, FlowType

functionTypeParam

t.functionTypeParam(name, typeAnnotation);

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

AST Node FunctionTypeParam shape:

• name: Identifier (default: null)
• typeAnnotation: FlowType (required)
• optional: boolean (default: null, excluded from builder function)

Aliases: Flow

genericTypeAnnotation

t.genericTypeAnnotation(id, typeParameters);

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

AST Node GenericTypeAnnotation shape:

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

Aliases: Flow, FlowType

identifier

t.identifier(name);

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

AST Node Identifier shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression, PatternLike, LVal, TSEntityName

ifStatement

t.ifStatement(test, consequent, alternate);

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

AST Node IfStatement shape:

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

Aliases: Standardized, StandardizedOrProposal, Statement, Conditional

import

t.import();

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

Aliases: Standardized, StandardizedOrProposal, Expression

importAttribute

t.importAttribute(key, value);

See also t.isImportAttribute(node, opts) and t.assertImportAttribute(node, opts).

AST Node ImportAttribute shape:

• key: Identifier | StringLiteral (required)
• value: StringLiteral (required)

Aliases: Proposal, StandardizedOrProposal

importDeclaration

t.importDeclaration(specifiers, source);

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

AST Node ImportDeclaration shape:

• specifiers: Array<ImportSpecifier | ImportDefaultSpecifier | ImportNamespaceSpecifier> (required)
• source: StringLiteral (required)
• assertions: Array<ImportAttribute> (default: null, excluded from builder function)
• importKind: "type" | "typeof" | "value" (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Statement, Declaration, ModuleDeclaration

importDefaultSpecifier

t.importDefaultSpecifier(local);

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

AST Node ImportDefaultSpecifier shape:

• local: Identifier (required)

Aliases: Standardized, StandardizedOrProposal, ModuleSpecifier

importNamespaceSpecifier

t.importNamespaceSpecifier(local);

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

AST Node ImportNamespaceSpecifier shape:

• local: Identifier (required)

Aliases: Standardized, StandardizedOrProposal, ModuleSpecifier

importSpecifier

t.importSpecifier(local, imported);

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

AST Node ImportSpecifier shape:

• local: Identifier (required)
• imported: Identifier | StringLiteral (required)
• importKind: "type" | "typeof" (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, ModuleSpecifier

indexedAccessType

t.indexedAccessType(objectType, indexType);

See also t.isIndexedAccessType(node, opts) and t.assertIndexedAccessType(node, opts).

AST Node IndexedAccessType shape:

• objectType: FlowType (required)
• indexType: FlowType (required)

Aliases: Flow, FlowType

indexedAccessType

t.indexedAccessType(objectType, indexType);

See also t.isIndexedAccessType(node, opts) and t.assertIndexedAccessType(node, opts).

AST Node IndexedAccessType shape:

• objectType: FlowType (required)
• indexType: FlowType (required)

Aliases: Flow, FlowType

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).

AST Node InterfaceDeclaration shape:

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

interfaceExtends

t.interfaceExtends(id, typeParameters);

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

AST Node InterfaceExtends shape:

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

Aliases: Flow

interfaceTypeAnnotation

t.interfaceTypeAnnotation(extends, body);

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

AST Node InterfaceTypeAnnotation shape:

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

Aliases: Flow, FlowType

interpreterDirective

t.interpreterDirective(value);

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

AST Node InterpreterDirective shape:

• value: string (required)

Aliases: Standardized, StandardizedOrProposal

intersectionTypeAnnotation

t.intersectionTypeAnnotation(types);

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

AST Node IntersectionTypeAnnotation shape:

• types: Array<FlowType> (required)

Aliases: Flow, FlowType

jsxAttribute

t.jsxAttribute(name, value);

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

AST Node JSXAttribute shape:

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

Aliases: JSX, Immutable

jsxClosingElement

t.jsxClosingElement(name);

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

AST Node JSXClosingElement shape:

• name: JSXIdentifier | JSXMemberExpression | JSXNamespacedName (required)

Aliases: JSX, Immutable

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).

AST Node JSXElement shape:

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

Aliases: JSX, Immutable, Expression

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).

AST Node JSXExpressionContainer shape:

• expression: Expression | JSXEmptyExpression (required)

Aliases: JSX, Immutable

jsxFragment

t.jsxFragment(openingFragment, closingFragment, children);

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

AST Node JSXFragment shape:

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

Aliases: JSX, Immutable, Expression

jsxIdentifier

t.jsxIdentifier(name);

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

AST Node JSXIdentifier shape:

• name: string (required)

Aliases: JSX

jsxMemberExpression

t.jsxMemberExpression(object, property);

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

AST Node JSXMemberExpression shape:

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

Aliases: JSX

jsxNamespacedName

t.jsxNamespacedName(namespace, name);

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

AST Node JSXNamespacedName shape:

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

Aliases: JSX

jsxOpeningElement

t.jsxOpeningElement(name, attributes, selfClosing);

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

AST Node JSXOpeningElement shape:

• name: JSXIdentifier | JSXMemberExpression | JSXNamespacedName (required)
• attributes: Array<JSXAttribute | JSXSpreadAttribute> (required)
• selfClosing: boolean (default: false)
• typeParameters: TypeParameterInstantiation | TSTypeParameterInstantiation (default: null, excluded from builder function)

Aliases: JSX, Immutable

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).

AST Node JSXSpreadAttribute shape:

• argument: Expression (required)

Aliases: JSX

jsxSpreadChild

t.jsxSpreadChild(expression);

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

AST Node JSXSpreadChild shape:

• expression: Expression (required)

Aliases: JSX, Immutable

jsxText

t.jsxText(value);

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

AST Node JSXText shape:

• value: string (required)

Aliases: JSX, Immutable

labeledStatement

t.labeledStatement(label, body);

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

AST Node LabeledStatement shape:

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

Aliases: Standardized, StandardizedOrProposal, Statement

logicalExpression

t.logicalExpression(operator, left, right);

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

AST Node LogicalExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Binary, Expression

memberExpression

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

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

AST Node MemberExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression, LVal

metaProperty

t.metaProperty(meta, property);

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

AST Node MetaProperty shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression

mixedTypeAnnotation

t.mixedTypeAnnotation();

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

Aliases: Flow, FlowType, FlowBaseAnnotation

moduleExpression

t.moduleExpression(body);

See also t.isModuleExpression(node, opts) and t.assertModuleExpression(node, opts).

AST Node ModuleExpression shape:

• body: Program (required)

Aliases: Proposal, StandardizedOrProposal, Expression

newExpression

t.newExpression(callee, arguments);

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

AST Node NewExpression shape:

• callee: Expression | V8IntrinsicIdentifier (required)
• arguments: Array<Expression | SpreadElement | JSXNamespacedName | ArgumentPlaceholder> (required)
• optional: true | false (default: null, excluded from builder function)
• typeArguments: TypeParameterInstantiation (default: null, excluded from builder function)
• typeParameters: TSTypeParameterInstantiation (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal

noop

t.noop();

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

Aliases: Miscellaneous

nullLiteral

t.nullLiteral();

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

Aliases: Standardized, StandardizedOrProposal, 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).

AST Node NullableTypeAnnotation shape:

• typeAnnotation: FlowType (required)

Aliases: Flow, FlowType

numberLiteralTypeAnnotation

t.numberLiteralTypeAnnotation(value);

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

AST Node NumberLiteralTypeAnnotation shape:

• value: number (required)

Aliases: Flow, FlowType

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).

AST Node NumericLiteral shape:

• value: number (required)

Aliases: Standardized, StandardizedOrProposal, Expression, Pureish, Literal, Immutable

objectExpression

t.objectExpression(properties);

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

AST Node ObjectExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression

objectMethod

t.objectMethod(kind, key, params, body, computed, generator, async);

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

AST Node ObjectMethod shape:

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

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

objectPattern

t.objectPattern(properties);

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

AST Node ObjectPattern shape:

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

Aliases: Standardized, StandardizedOrProposal, Pattern, PatternLike, LVal

objectProperty

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

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

AST Node ObjectProperty shape:

• 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)

Aliases: Standardized, StandardizedOrProposal, UserWhitespacable, Property, ObjectMember

objectTypeAnnotation

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

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

AST Node ObjectTypeAnnotation shape:

• properties: Array<ObjectTypeProperty | ObjectTypeSpreadProperty> (required)
• indexers: Array<ObjectTypeIndexer> (default: null)
• callProperties: Array<ObjectTypeCallProperty> (default: null)
• internalSlots: Array<ObjectTypeInternalSlot> (default: null)
• exact: boolean (default: false)
• inexact: boolean (default: null, excluded from builder function)

Aliases: Flow, FlowType

objectTypeCallProperty

t.objectTypeCallProperty(value);

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

AST Node ObjectTypeCallProperty shape:

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

Aliases: Flow, UserWhitespacable

objectTypeIndexer

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

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

AST Node ObjectTypeIndexer shape:

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

Aliases: Flow, UserWhitespacable

objectTypeInternalSlot

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

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

AST Node ObjectTypeInternalSlot shape:

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

Aliases: Flow, UserWhitespacable

objectTypeProperty

t.objectTypeProperty(key, value, variance);

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

AST Node ObjectTypeProperty shape:

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

Aliases: Flow, UserWhitespacable

objectTypeSpreadProperty

t.objectTypeSpreadProperty(argument);

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

AST Node ObjectTypeSpreadProperty shape:

• argument: FlowType (required)

Aliases: Flow, UserWhitespacable

opaqueType

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

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

AST Node OpaqueType shape:

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

optionalCallExpression

t.optionalCallExpression(callee, arguments, optional);

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

AST Node OptionalCallExpression shape:

• callee: Expression (required)
• arguments: Array<Expression | SpreadElement | JSXNamespacedName | ArgumentPlaceholder> (required)
• optional: boolean (required)
• typeArguments: TypeParameterInstantiation (default: null, excluded from builder function)
• typeParameters: TSTypeParameterInstantiation (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Expression

optionalIndexedAccessType

t.optionalIndexedAccessType(objectType, indexType);

See also t.isOptionalIndexedAccessType(node, opts) and t.assertOptionalIndexedAccessType(node, opts).

AST Node OptionalIndexedAccessType shape:

• objectType: FlowType (required)
• indexType: FlowType (required)
• optional: boolean (required)

Aliases: Flow, FlowType

optionalIndexedAccessType

t.optionalIndexedAccessType(objectType, indexType);

See also t.isOptionalIndexedAccessType(node, opts) and t.assertOptionalIndexedAccessType(node, opts).

AST Node OptionalIndexedAccessType shape:

• objectType: FlowType (required)
• indexType: FlowType (required)
• optional: boolean (required)

Aliases: Flow, FlowType

optionalMemberExpression

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

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

AST Node OptionalMemberExpression shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression

parenthesizedExpression

t.parenthesizedExpression(expression);

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

AST Node ParenthesizedExpression shape:

• expression: Expression (required)

Aliases: Standardized, StandardizedOrProposal, Expression, ExpressionWrapper

pipelineBareFunction

t.pipelineBareFunction(callee);

See also t.isPipelineBareFunction(node, opts) and t.assertPipelineBareFunction(node, opts).

AST Node PipelineBareFunction shape:

• callee: Expression (required)

Aliases: Expression, Proposal, StandardizedOrProposal

pipelinePrimaryTopicReference

t.pipelinePrimaryTopicReference();

See also t.isPipelinePrimaryTopicReference(node, opts) and t.assertPipelinePrimaryTopicReference(node, opts).

Aliases: Proposal, StandardizedOrProposal, Expression

pipelineTopicExpression

t.pipelineTopicExpression(expression);

See also t.isPipelineTopicExpression(node, opts) and t.assertPipelineTopicExpression(node, opts).

AST Node PipelineTopicExpression shape:

• expression: Expression (required)

Aliases: Expression, Proposal, StandardizedOrProposal

placeholder

t.placeholder(expectedNode, name);

See also t.isPlaceholder(node, opts) and t.assertPlaceholder(node, opts).

AST Node Placeholder shape:

• expectedNode: "Identifier" | "StringLiteral" | "Expression" | "Statement" | "Declaration" | "BlockStatement" | "ClassBody" | "Pattern" (required)
• name: Identifier (required)

Aliases: Miscellaneous

privateName

t.privateName(id);

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

AST Node PrivateName shape:

• id: Identifier (required)

Aliases: Standardized, StandardizedOrProposal, Private

program

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

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

AST Node Program shape:

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

Aliases: Standardized, StandardizedOrProposal, Scopable, BlockParent, Block

qualifiedTypeIdentifier

t.qualifiedTypeIdentifier(id, qualification);

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

AST Node QualifiedTypeIdentifier shape:

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

Aliases: Flow

recordExpression

t.recordExpression(properties);

See also t.isRecordExpression(node, opts) and t.assertRecordExpression(node, opts).

AST Node RecordExpression shape:

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

Aliases: Proposal, StandardizedOrProposal, Expression

regExpLiteral

t.regExpLiteral(pattern, flags);

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

AST Node RegExpLiteral shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression, Pureish, Literal

restElement

t.restElement(argument);

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

AST Node RestElement shape:

• argument: LVal (required)
• decorators: Array<Decorator> (default: null, excluded from builder function)
• optional: boolean (default: null, excluded from builder function)
• typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, LVal, PatternLike

returnStatement

t.returnStatement(argument);

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

AST Node ReturnStatement shape:

• argument: Expression (default: null)

Aliases: Standardized, StandardizedOrProposal, Statement, Terminatorless, CompletionStatement

sequenceExpression

t.sequenceExpression(expressions);

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

AST Node SequenceExpression shape:

• expressions: Array<Expression> (required)

Aliases: Standardized, StandardizedOrProposal, Expression

spreadElement

t.spreadElement(argument);

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

AST Node SpreadElement shape:

• argument: Expression (required)

Aliases: Standardized, StandardizedOrProposal, UnaryLike

staticBlock

t.staticBlock(body);

See also t.isStaticBlock(node, opts) and t.assertStaticBlock(node, opts).

AST Node StaticBlock shape:

• body: Array<Statement> (required)

Aliases: Proposal, StandardizedOrProposal, Scopable, BlockParent

stringLiteral

t.stringLiteral(value);

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

AST Node StringLiteral shape:

• value: string (required)

Aliases: Standardized, StandardizedOrProposal, Expression, Pureish, Literal, Immutable

stringLiteralTypeAnnotation

t.stringLiteralTypeAnnotation(value);

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

AST Node StringLiteralTypeAnnotation shape:

• value: string (required)

Aliases: Flow, FlowType

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: Standardized, StandardizedOrProposal, Expression

switchCase

t.switchCase(test, consequent);

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

AST Node SwitchCase shape:

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

Aliases: Standardized, StandardizedOrProposal

switchStatement

t.switchStatement(discriminant, cases);

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

AST Node SwitchStatement shape:

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

Aliases: Standardized, StandardizedOrProposal, Statement, BlockParent, Scopable

symbolTypeAnnotation

t.symbolTypeAnnotation();

See also t.isSymbolTypeAnnotation(node, opts) and t.assertSymbolTypeAnnotation(node, opts).

Aliases: Flow, FlowType, FlowBaseAnnotation

tsAnyKeyword

t.tsAnyKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsArrayType

t.tsArrayType(elementType);

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

AST Node TSArrayType shape:

• elementType: TSType (required)

Aliases: TypeScript, TSType

tsAsExpression

t.tsAsExpression(expression, typeAnnotation);

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

AST Node TSAsExpression shape:

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

Aliases: TypeScript, Expression

tsBigIntKeyword

t.tsBigIntKeyword();

See also t.isTSBigIntKeyword(node, opts) and t.assertTSBigIntKeyword(node, opts).

Aliases: TypeScript, TSType, TSBaseType

tsBooleanKeyword

t.tsBooleanKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsCallSignatureDeclaration

t.tsCallSignatureDeclaration(typeParameters, parameters, typeAnnotation);

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

AST Node TSCallSignatureDeclaration shape:

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

Aliases: TypeScript, TSTypeElement

tsConditionalType

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

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

AST Node TSConditionalType shape:

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

Aliases: TypeScript, TSType

tsConstructSignatureDeclaration

t.tsConstructSignatureDeclaration(typeParameters, parameters, typeAnnotation);

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

AST Node TSConstructSignatureDeclaration shape:

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

Aliases: TypeScript, TSTypeElement

tsConstructorType

t.tsConstructorType(typeParameters, parameters, typeAnnotation);

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

AST Node TSConstructorType shape:

• typeParameters: TSTypeParameterDeclaration (default: null)
• parameters: Array<Identifier | RestElement> (required)
• typeAnnotation: TSTypeAnnotation (default: null)
• abstract: boolean (default: null, excluded from builder function)

Aliases: TypeScript, TSType

tsDeclareFunction

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

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

AST Node TSDeclareFunction shape:

• id: Identifier (default: null)
• typeParameters: TSTypeParameterDeclaration | Noop (default: null)
• params: Array<Identifier | Pattern | RestElement> (required)
• returnType: TSTypeAnnotation | Noop (default: null)
• async: boolean (default: false, excluded from builder function)
• declare: boolean (default: null, excluded from builder function)
• generator: boolean (default: false, excluded from builder function)

Aliases: TypeScript, Statement, Declaration

tsDeclareMethod

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

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

AST Node TSDeclareMethod shape:

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

Aliases: TypeScript

tsEnumDeclaration

t.tsEnumDeclaration(id, members);

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

AST Node TSEnumDeclaration shape:

• id: Identifier (required)
• members: Array<TSEnumMember> (required)
• const: boolean (default: null, excluded from builder function)
• declare: boolean (default: null, excluded from builder function)
• initializer: Expression (default: null, excluded from builder function)

Aliases: TypeScript, Statement, Declaration

tsEnumMember

t.tsEnumMember(id, initializer);

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

AST Node TSEnumMember shape:

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

Aliases: TypeScript

tsExportAssignment

t.tsExportAssignment(expression);

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

AST Node TSExportAssignment shape:

• expression: Expression (required)

Aliases: TypeScript, Statement

tsExpressionWithTypeArguments

t.tsExpressionWithTypeArguments(expression, typeParameters);

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

AST Node TSExpressionWithTypeArguments shape:

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

Aliases: TypeScript, TSType

tsExternalModuleReference

t.tsExternalModuleReference(expression);

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

AST Node TSExternalModuleReference shape:

• expression: StringLiteral (required)

Aliases: TypeScript

tsFunctionType

t.tsFunctionType(typeParameters, parameters, typeAnnotation);

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

AST Node TSFunctionType shape:

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

Aliases: TypeScript, TSType

tsImportEqualsDeclaration

t.tsImportEqualsDeclaration(id, moduleReference);

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

AST Node TSImportEqualsDeclaration shape:

• id: Identifier (required)
• moduleReference: TSEntityName | TSExternalModuleReference (required)
• importKind: "type" | "value" (default: null, excluded from builder function)
• isExport: boolean (required)

Aliases: TypeScript, Statement

tsImportType

t.tsImportType(argument, qualifier, typeParameters);

See also t.isTSImportType(node, opts) and t.assertTSImportType(node, opts).

AST Node TSImportType shape:

• argument: StringLiteral (required)
• qualifier: TSEntityName (default: null)
• typeParameters: TSTypeParameterInstantiation (default: null)

Aliases: TypeScript, TSType

tsIndexSignature

t.tsIndexSignature(parameters, typeAnnotation);

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

AST Node TSIndexSignature shape:

• parameters: Array<Identifier> (required)
• typeAnnotation: TSTypeAnnotation (default: null)
• readonly: boolean (default: null, excluded from builder function)
• static: boolean (default: null, excluded from builder function)

Aliases: TypeScript, TSTypeElement

tsIndexedAccessType

t.tsIndexedAccessType(objectType, indexType);

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

AST Node TSIndexedAccessType shape:

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

Aliases: TypeScript, TSType

tsInferType

t.tsInferType(typeParameter);

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

AST Node TSInferType shape:

• typeParameter: TSTypeParameter (required)

Aliases: TypeScript, TSType

tsInterfaceBody

t.tsInterfaceBody(body);

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

AST Node TSInterfaceBody shape:

• body: Array<TSTypeElement> (required)

Aliases: TypeScript

tsInterfaceDeclaration

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

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

AST Node TSInterfaceDeclaration shape:

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

Aliases: TypeScript, Statement, Declaration

tsIntersectionType

t.tsIntersectionType(types);

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

AST Node TSIntersectionType shape:

• types: Array<TSType> (required)

Aliases: TypeScript, TSType

tsIntrinsicKeyword

t.tsIntrinsicKeyword();

See also t.isTSIntrinsicKeyword(node, opts) and t.assertTSIntrinsicKeyword(node, opts).

Aliases: TypeScript, TSType, TSBaseType

tsLiteralType

t.tsLiteralType(literal);

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

AST Node TSLiteralType shape:

• literal: NumericLiteral | StringLiteral | BooleanLiteral | BigIntLiteral | UnaryExpression (required)

Aliases: TypeScript, TSType, TSBaseType

tsMappedType

t.tsMappedType(typeParameter, typeAnnotation, nameType);

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

AST Node TSMappedType shape:

• typeParameter: TSTypeParameter (required)
• typeAnnotation: TSType (default: null)
• nameType: TSType (default: null)
• optional: boolean (default: null, excluded from builder function)
• readonly: boolean (default: null, excluded from builder function)

Aliases: TypeScript, TSType

tsMethodSignature

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

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

AST Node TSMethodSignature shape:

• key: Expression (required)
• typeParameters: TSTypeParameterDeclaration (default: null)
• parameters: Array<Identifier | RestElement> (required)
• typeAnnotation: TSTypeAnnotation (default: null)
• computed: boolean (default: null, excluded from builder function)
• kind: "method" | "get" | "set" (required)
• optional: boolean (default: null, excluded from builder function)

Aliases: TypeScript, TSTypeElement

tsModuleBlock

t.tsModuleBlock(body);

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

AST Node TSModuleBlock shape:

• body: Array<Statement> (required)

Aliases: TypeScript, Scopable, Block, BlockParent

tsModuleDeclaration

t.tsModuleDeclaration(id, body);

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

AST Node TSModuleDeclaration shape:

• id: Identifier | StringLiteral (required)
• body: TSModuleBlock | TSModuleDeclaration (required)
• declare: boolean (default: null, excluded from builder function)
• global: boolean (default: null, excluded from builder function)

Aliases: TypeScript, Statement, Declaration

tsNamedTupleMember

t.tsNamedTupleMember(label, elementType, optional);

See also t.isTSNamedTupleMember(node, opts) and t.assertTSNamedTupleMember(node, opts).

AST Node TSNamedTupleMember shape:

• label: Identifier (required)
• elementType: TSType (required)
• optional: boolean (default: false)

Aliases: TypeScript

tsNamespaceExportDeclaration

t.tsNamespaceExportDeclaration(id);

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

AST Node TSNamespaceExportDeclaration shape:

• id: Identifier (required)

Aliases: TypeScript, Statement

tsNeverKeyword

t.tsNeverKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsNonNullExpression

t.tsNonNullExpression(expression);

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

AST Node TSNonNullExpression shape:

• expression: Expression (required)

Aliases: TypeScript, Expression

tsNullKeyword

t.tsNullKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsNumberKeyword

t.tsNumberKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsObjectKeyword

t.tsObjectKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsOptionalType

t.tsOptionalType(typeAnnotation);

See also t.isTSOptionalType(node, opts) and t.assertTSOptionalType(node, opts).

AST Node TSOptionalType shape:

• typeAnnotation: TSType (required)

Aliases: TypeScript, TSType

tsParameterProperty

t.tsParameterProperty(parameter);

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

AST Node TSParameterProperty shape:

• parameter: Identifier | AssignmentPattern (required)
• accessibility: "public" | "private" | "protected" (default: null, excluded from builder function)
• decorators: Array<Decorator> (default: null, excluded from builder function)
• override: boolean (default: null, excluded from builder function)
• readonly: boolean (default: null, excluded from builder function)

Aliases: TypeScript, LVal

tsParenthesizedType

t.tsParenthesizedType(typeAnnotation);

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

AST Node TSParenthesizedType shape:

• typeAnnotation: TSType (required)

Aliases: TypeScript, TSType

tsPropertySignature

t.tsPropertySignature(key, typeAnnotation, initializer);

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

AST Node TSPropertySignature shape:

• key: Expression (required)
• typeAnnotation: TSTypeAnnotation (default: null)
• initializer: Expression (default: null)
• computed: boolean (default: null, excluded from builder function)
• kind: "get" | "set" (required)
• optional: boolean (default: null, excluded from builder function)
• readonly: boolean (default: null, excluded from builder function)

Aliases: TypeScript, TSTypeElement

tsQualifiedName

t.tsQualifiedName(left, right);

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

AST Node TSQualifiedName shape:

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

Aliases: TypeScript, TSEntityName

tsRestType

t.tsRestType(typeAnnotation);

See also t.isTSRestType(node, opts) and t.assertTSRestType(node, opts).

AST Node TSRestType shape:

• typeAnnotation: TSType (required)

Aliases: TypeScript, TSType

tsStringKeyword

t.tsStringKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsSymbolKeyword

t.tsSymbolKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsThisType

t.tsThisType();

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

Aliases: TypeScript, TSType, TSBaseType

tsTupleType

t.tsTupleType(elementTypes);

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

AST Node TSTupleType shape:

• elementTypes: Array<TSType | TSNamedTupleMember> (required)

Aliases: TypeScript, TSType

tsTypeAliasDeclaration

t.tsTypeAliasDeclaration(id, typeParameters, typeAnnotation);

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

AST Node TSTypeAliasDeclaration shape:

• id: Identifier (required)
• typeParameters: TSTypeParameterDeclaration (default: null)
• typeAnnotation: TSType (required)
• declare: boolean (default: null, excluded from builder function)

Aliases: TypeScript, Statement, Declaration

tsTypeAnnotation

t.tsTypeAnnotation(typeAnnotation);

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

AST Node TSTypeAnnotation shape:

• typeAnnotation: TSType (required)

Aliases: TypeScript

tsTypeAssertion

t.tsTypeAssertion(typeAnnotation, expression);

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

AST Node TSTypeAssertion shape:

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

Aliases: TypeScript, Expression

tsTypeLiteral

t.tsTypeLiteral(members);

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

AST Node TSTypeLiteral shape:

• members: Array<TSTypeElement> (required)

Aliases: TypeScript, TSType

tsTypeOperator

t.tsTypeOperator(typeAnnotation);

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

AST Node TSTypeOperator shape:

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

Aliases: TypeScript, TSType

tsTypeParameter

t.tsTypeParameter(constraint, default, name);

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

AST Node TSTypeParameter shape:

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

Aliases: TypeScript

tsTypeParameterDeclaration

t.tsTypeParameterDeclaration(params);

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

AST Node TSTypeParameterDeclaration shape:

• params: Array<TSTypeParameter> (required)

Aliases: TypeScript

tsTypeParameterInstantiation

t.tsTypeParameterInstantiation(params);

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

AST Node TSTypeParameterInstantiation shape:

• params: Array<TSType> (required)

Aliases: TypeScript

tsTypePredicate

t.tsTypePredicate(parameterName, typeAnnotation, asserts);

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

AST Node TSTypePredicate shape:

• parameterName: Identifier | TSThisType (required)
• typeAnnotation: TSTypeAnnotation (default: null)
• asserts: boolean (default: null)

Aliases: TypeScript, TSType

tsTypeQuery

t.tsTypeQuery(exprName);

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

AST Node TSTypeQuery shape:

• exprName: TSEntityName | TSImportType (required)

Aliases: TypeScript, TSType

tsTypeReference

t.tsTypeReference(typeName, typeParameters);

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

AST Node TSTypeReference shape:

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

Aliases: TypeScript, TSType

tsUndefinedKeyword

t.tsUndefinedKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

tsUnionType

t.tsUnionType(types);

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

AST Node TSUnionType shape:

• types: Array<TSType> (required)

Aliases: TypeScript, TSType

tsUnknownKeyword

t.tsUnknownKeyword();

See also t.isTSUnknownKeyword(node, opts) and t.assertTSUnknownKeyword(node, opts).

Aliases: TypeScript, TSType, TSBaseType

tsVoidKeyword

t.tsVoidKeyword();

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

Aliases: TypeScript, TSType, TSBaseType

taggedTemplateExpression

t.taggedTemplateExpression(tag, quasi);

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

AST Node TaggedTemplateExpression shape:

• tag: Expression (required)
• quasi: TemplateLiteral (required)
• typeParameters: TypeParameterInstantiation | TSTypeParameterInstantiation (default: null, excluded from builder function)

Aliases: Standardized, StandardizedOrProposal, Expression

templateElement

t.templateElement(value, tail);

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

AST Node TemplateElement shape:

• value: { raw: string, cooked?: string } (required)
• tail: boolean (default: false)

Aliases: Standardized, StandardizedOrProposal

templateLiteral

t.templateLiteral(quasis, expressions);

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

AST Node TemplateLiteral shape:

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

Aliases: Standardized, StandardizedOrProposal, Expression, Literal

thisExpression

t.thisExpression();

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

Aliases: Standardized, StandardizedOrProposal, Expression

thisTypeAnnotation

t.thisTypeAnnotation();

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

Aliases: Flow, FlowType, FlowBaseAnnotation

throwStatement

t.throwStatement(argument);