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@babel/types

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    @babel/types

Babel Types is a Lodash-esque utility library for AST nodes


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Maintainers
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Package description

What is @babel/types?

The @babel/types package is a part of the Babel compiler ecosystem. It contains methods for building and validating AST (Abstract Syntax Tree) nodes for JavaScript-like languages. It is commonly used for creating and transforming code within Babel plugins.

What are @babel/types's main functionalities?

AST Node Creation

This feature allows the creation of AST nodes. The code sample demonstrates how to create an identifier and a numeric literal using the package.

const t = require('@babel/types');
const identifier = t.identifier('myVariable');
const numericLiteral = t.numericLiteral(123);

AST Node Validation

This feature is used to validate if a node is of a specific type. The code sample checks if a node is an identifier.

const t = require('@babel/types');
const isValid = t.isIdentifier(t.identifier('myVariable'));

AST Node Transformation

This feature allows the transformation of AST nodes. The code sample creates a binary expression node that represents 'a + b'.

const t = require('@babel/types');
const binaryExpression = t.binaryExpression('+', t.identifier('a'), t.identifier('b'));

AST Node Traversal

This feature is not directly provided by @babel/types but is often used in conjunction with it. It involves traversing the AST and updating nodes. The code sample renames an identifier within the AST.

const t = require('@babel/types');
const traverse = require('@babel/traverse').default;
const ast = t.file(t.program([t.expressionStatement(t.identifier('myVariable'))]));
traverse(ast, {
  enter(path) {
    if (t.isIdentifier(path.node)) {
      path.node.name = 'newVariable';
    }
  }
});

Other packages similar to @babel/types

Readme

Source

@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

anyTypeAnnotation

t.anyTypeAnnotation()

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

Aliases: Flow, FlowBaseAnnotation


arrayExpression

t.arrayExpression(elements)

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

Aliases: Expression

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

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

  • elementType (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 | 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)

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()

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

Aliases: Flow


booleanTypeAnnotation

t.booleanTypeAnnotation()

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

Aliases: Flow, 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)
  • typeParameters: TypeParameterInstantiation (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 | 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 | FlowClassImplements> (default: null)
  • mixins (default: null)
  • superTypeParameters: TypeParameterInstantiation (default: null)
  • typeParameters: TypeParameterDeclaration | 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 | FlowClassImplements> (default: null)
  • mixins (default: null)
  • superTypeParameters: TypeParameterInstantiation (default: null)
  • typeParameters: TypeParameterDeclaration | Noop (default: null)

classImplements

t.classImplements(id, typeParameters)

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

Aliases: Flow

  • id (required)
  • typeParameters (required)

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 | Noop (default: null)

classProperty

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

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

Aliases: Property

  • key (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)
  • 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 (required)
  • typeParameters (required)
  • extends (required)
  • body (required)

declareExportAllDeclaration

t.declareExportAllDeclaration(source)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • source (required)

declareExportDeclaration

t.declareExportDeclaration(declaration, specifiers, source)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • declaration (required)
  • specifiers (required)
  • source (required)

declareFunction

t.declareFunction(id)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • id (required)

declareInterface

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

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • id (required)
  • typeParameters (required)
  • extends (required)
  • body (required)

declareModule

t.declareModule(id, body)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • id (required)
  • body (required)

declareModuleExports

t.declareModuleExports(typeAnnotation)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • 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 (required)
  • typeParameters (required)
  • supertype (required)

declareTypeAlias

t.declareTypeAlias(id, typeParameters, right)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • id (required)
  • typeParameters (required)
  • right (required)

declareVariable

t.declareVariable(id)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • id (required)

declaredPredicate

t.declaredPredicate(value)

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

Aliases: Flow, FlowPredicate

  • value (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, FlowBaseAnnotation


existsTypeAnnotation

t.existsTypeAnnotation()

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

Aliases: Flow


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 | 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 | Noop (default: null)

functionTypeAnnotation

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

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

Aliases: Flow

  • typeParameters (required)
  • params (required)
  • rest (required)
  • returnType (required)

functionTypeParam

t.functionTypeParam(name, typeAnnotation)

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

Aliases: Flow

  • name (required)
  • typeAnnotation (required)

genericTypeAnnotation

t.genericTypeAnnotation(id, typeParameters)

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

Aliases: Flow

  • id (required)
  • typeParameters (required)

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 (required)
  • typeParameters (required)
  • extends (required)
  • body (required)

interfaceExtends

t.interfaceExtends(id, typeParameters)

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

Aliases: Flow

  • id (required)
  • typeParameters (required)

intersectionTypeAnnotation

t.intersectionTypeAnnotation(types)

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

Aliases: Flow

  • types (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 | 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)

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> (required)
  • selfClosing (required)

jSXEmptyExpression

t.jSXEmptyExpression()

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

Aliases: JSX, Expression


jSXExpressionContainer

t.jSXExpressionContainer(expression)

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

Aliases: JSX, Immutable

  • expression: Expression (required)

jSXIdentifier

t.jSXIdentifier(name)

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

Aliases: JSX, Expression

  • name: string (required)

jSXMemberExpression

t.jSXMemberExpression(object, property)

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

Aliases: JSX, Expression

  • 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)

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, 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)
  • typeParameters: TypeParameterInstantiation (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, FlowBaseAnnotation


nullableTypeAnnotation

t.nullableTypeAnnotation(typeAnnotation)

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

Aliases: Flow

  • typeAnnotation (required)

numberLiteralTypeAnnotation

t.numberLiteralTypeAnnotation()

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

Aliases: Flow


numberTypeAnnotation

t.numberTypeAnnotation()

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

Aliases: Flow, 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 | 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)

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

Aliases: Flow

  • properties (required)
  • indexers (required)
  • callProperties (required)

objectTypeCallProperty

t.objectTypeCallProperty(value)

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

Aliases: Flow, UserWhitespacable

  • value (required)

objectTypeIndexer

t.objectTypeIndexer(id, key, value)

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

Aliases: Flow, UserWhitespacable

  • id (required)
  • key (required)
  • value (required)

objectTypeProperty

t.objectTypeProperty(key, value)

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

Aliases: Flow, UserWhitespacable

  • key (required)
  • value (required)

objectTypeSpreadProperty

t.objectTypeSpreadProperty(argument)

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

Aliases: Flow, UserWhitespacable

  • argument (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 (required)
  • typeParameters (required)
  • supertype (required)
  • impltype (required)

parenthesizedExpression

t.parenthesizedExpression(expression)

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

Aliases: Expression, ExpressionWrapper

  • expression: Expression (required)

program

t.program(body, directives, sourceType)

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')
  • sourceFile: string (default: null)

qualifiedTypeIdentifier

t.qualifiedTypeIdentifier(id, qualification)

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

Aliases: Flow

  • id (required)
  • qualification (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()

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

Aliases: Flow


stringTypeAnnotation

t.stringTypeAnnotation()

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

Aliases: Flow, 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: TypeParameterDeclaration (default: null)
  • parameters: Array<Identifier | RestElement> (default: null)
  • typeAnnotation: TSTypeAnnotation (default: null)

tSConstructSignatureDeclaration

t.tSConstructSignatureDeclaration(typeParameters, parameters, typeAnnotation)

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

Aliases: TSTypeElement

  • typeParameters: TypeParameterDeclaration (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: TypeParameterDeclaration (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: TypeParameterDeclaration | Noop (default: null)
  • params: Array<LVal> (required)
  • returnType: TypeAnnotation | 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 (required)
  • typeParameters: TypeParameterDeclaration | Noop (default: null)
  • params: Array<LVal> (required)
  • returnType: TypeAnnotation | 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: TypeParameterInstantiation (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: TypeParameterDeclaration (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)

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: TypeParameterDeclaration (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: TypeParameter (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: TypeParameterDeclaration (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: TypeParameterDeclaration (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)

tSTypeParameterInstantiation

t.tSTypeParameterInstantiation(params)

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

  • params: Array<TSType> (required)

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)

tSTypeQuery

t.tSTypeQuery(exprName)

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

Aliases: TSType

  • exprName: TSEntityName (required)

tSTypeReference

t.tSTypeReference(typeName, typeParameters)

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

Aliases: TSType

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

tSUndefinedKeyword

t.tSUndefinedKeyword()

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

Aliases: TSType


tSUnionType

t.tSUnionType(types)

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

Aliases: TSType

  • types: Array<TSType> (required)

tSVoidKeyword

t.tSVoidKeyword()

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

Aliases: TSType


taggedTemplateExpression

t.taggedTemplateExpression(tag, quasi)

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

Aliases: Expression

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

templateElement

t.templateElement(value, tail)

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

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

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)

thisExpression

t.thisExpression()

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

Aliases: Expression


thisTypeAnnotation

t.thisTypeAnnotation()

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

Aliases: Flow, FlowBaseAnnotation


throwStatement

t.throwStatement(argument)

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

Aliases: Statement, Terminatorless, CompletionStatement

  • argument: Expression (required)

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)

tupleTypeAnnotation

t.tupleTypeAnnotation(types)

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

Aliases: Flow

  • types (required)

typeAlias

t.typeAlias(id, typeParameters, right)

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

  • id (required)
  • typeParameters (required)
  • right (required)

typeAnnotation

t.typeAnnotation(typeAnnotation)

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

Aliases: Flow

  • typeAnnotation: Flow (required)

typeCastExpression

t.typeCastExpression(expression, typeAnnotation)

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

Aliases: Flow, ExpressionWrapper, Expression

  • expression (required)
  • typeAnnotation (required)

typeParameter

t.typeParameter(bound, default)

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

Aliases: Flow

  • bound: TypeAnnotation (default: null)
  • default: Flow (default: null)
  • name: string (default: null)

typeParameterDeclaration

t.typeParameterDeclaration(params)

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

Aliases: Flow

  • params: Array<TypeParameter> (required)

typeParameterInstantiation

t.typeParameterInstantiation(params)

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

Aliases: Flow

  • params: Array<Flow> (required)

typeofTypeAnnotation

t.typeofTypeAnnotation(argument)

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

Aliases: Flow

  • argument (required)

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)

unionTypeAnnotation

t.unionTypeAnnotation(types)

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

Aliases: Flow

  • types (required)

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)

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)

variableDeclarator

t.variableDeclarator(id, init)

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

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

voidTypeAnnotation

t.voidTypeAnnotation()

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

Aliases: Flow, FlowBaseAnnotation


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)

withStatement

t.withStatement(object, body)

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

Aliases: Statement

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

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)

FAQs

Last updated on 30 Oct 2017

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