babel-types

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

Install

``sh
npm install --save-dev babel-types
`

API

$3


`javascript
t.anyTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.arrayExpression(elements)
`

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

Aliases: Expression

- elements: Array (default: [])

---

$3


`javascript
t.arrayPattern(elements, typeAnnotation)
`

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

Aliases: Pattern, LVal

- elements: Array (required)
- typeAnnotation (required)
- decorators: Array (default: null)

---

$3


`javascript
t.arrayTypeAnnotation(elementType)
`

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

Aliases: Flow

- elementType (required)

---

$3


`javascript
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 (required)
- body: BlockStatement | Expression (required)
- async: boolean (default: false)
- returnType (default: null)
- typeParameters (default: null)

---

$3


`javascript
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)

---

$3


`javascript
t.assignmentPattern(left, right)
`

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

Aliases: Pattern, LVal

- left: Identifier (required)
- right: Expression (required)
- decorators: Array (default: null)

---

$3


`javascript
t.awaitExpression(argument)
`

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

Aliases: Expression, Terminatorless

- argument: Expression (required)

---

$3


`javascript
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)

---

$3


`javascript
t.bindExpression(object, callee)
`

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

Aliases: Expression

- object (required)
- callee (required)

---

$3


`javascript
t.blockStatement(body, directives)
`

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

Aliases: Scopable, BlockParent, Block, Statement

- body: Array (required)
- directives: Array (default: [])

---

$3


`javascript
t.booleanLiteral(value)
`

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

Aliases: Expression, Pureish, Literal, Immutable

- value: boolean (required)

---

$3


`javascript
t.booleanLiteralTypeAnnotation()
`

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

Aliases: Flow


---

$3


`javascript
t.booleanTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.breakStatement(label)
`

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

Aliases: Statement, Terminatorless, CompletionStatement

- label: Identifier (default: null)

---

$3


`javascript
t.callExpression(callee, arguments)
`

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

Aliases: Expression

- callee: Expression (required)
- arguments: Array (required)

---

$3


`javascript
t.catchClause(param, body)
`

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

Aliases: Scopable

- param: Identifier (required)
- body: BlockStatement (required)

---

$3


`javascript
t.classBody(body)
`

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

- body: Array (required)

---

$3


`javascript
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 (required)
- superClass: Expression (default: null)
- body: ClassBody (required)
- decorators: Array (required)
- implements (default: null)
- mixins (default: null)
- superTypeParameters (default: null)
- typeParameters (default: null)

---

$3


`javascript
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 (required)
- implements (default: null)
- mixins (default: null)
- superTypeParameters (default: null)
- typeParameters (default: null)

---

$3


`javascript
t.classImplements(id, typeParameters)
`

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

Aliases: Flow

- id (required)
- typeParameters (required)

---

$3


`javascript
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')
- keyif computed then Expression else Identifier | Literal (required)
- params: Array (required)
- body: BlockStatement (required)
- computed: boolean (default: false)
- static: boolean (default: false)
- async: boolean (default: false)
- decorators (default: null)
- generator: boolean (default: false)
- returnType (default: null)
- typeParameters (default: null)

---

$3


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

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

Aliases: Property

- key (required)
- value (required)
- typeAnnotation (required)
- decorators (required)
- computed: boolean (default: false)

---

$3


`javascript
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)

---

$3


`javascript
t.continueStatement(label)
`

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

Aliases: Statement, Terminatorless, CompletionStatement

- label: Identifier (default: null)

---

$3


`javascript
t.debuggerStatement()
`

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

Aliases: Statement


---

$3


`javascript
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)

---

$3


`javascript
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)

---

$3


`javascript
t.declareFunction(id)
`

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

- id (required)

---

$3


`javascript
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)

---

$3


`javascript
t.declareModule(id, body)
`

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

- id (required)
- body (required)

---

$3


`javascript
t.declareModuleExports(typeAnnotation)
`

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

- typeAnnotation (required)

---

$3


`javascript
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)

---

$3


`javascript
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)

---

$3


`javascript
t.declareVariable(id)
`

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

- id (required)

---

$3


`javascript
t.decorator(expression)
`

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

- expression: Expression (required)

---

$3


`javascript
t.directive(value)
`

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

- value: DirectiveLiteral (required)

---

$3


`javascript
t.directiveLiteral(value)
`

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

- value: string (required)

---

$3


`javascript
t.doExpression(body)
`

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

Aliases: Expression

- body: BlockStatement (required)

---

$3


`javascript
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)

---

$3


`javascript
t.emptyStatement()
`

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

Aliases: Statement


---

$3


`javascript
t.emptyTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.existentialTypeParam()
`

See also t.isExistentialTypeParam(node, opts) and t.assertExistentialTypeParam(node, opts).

Aliases: Flow


---

$3


`javascript
t.exportAllDeclaration(source)
`

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

Aliases: Statement, Declaration, ModuleDeclaration, ExportDeclaration

- source: StringLiteral (required)

---

$3


`javascript
t.exportDefaultDeclaration(declaration)
`

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

Aliases: Statement, Declaration, ModuleDeclaration, ExportDeclaration

- declaration: FunctionDeclaration | ClassDeclaration | Expression (required)

---

$3


`javascript
t.exportDefaultSpecifier(exported)
`

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

Aliases: ModuleSpecifier

- exported: Identifier (required)

---

$3


`javascript
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 (required)
- source: StringLiteral (default: null)

---

$3


`javascript
t.exportNamespaceSpecifier(exported)
`

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

Aliases: ModuleSpecifier

- exported: Identifier (required)

---

$3


`javascript
t.exportSpecifier(local, exported)
`

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

Aliases: ModuleSpecifier

- local: Identifier (required)
- exported: Identifier (required)

---

$3


`javascript
t.expressionStatement(expression)
`

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

Aliases: Statement, ExpressionWrapper

- expression: Expression (required)

---

$3


`javascript
t.file(program, comments, tokens)
`

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

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

---

$3


`javascript
t.forAwaitStatement(left, right, body)
`

See also t.isForAwaitStatement(node, opts) and t.assertForAwaitStatement(node, opts).

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

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

---

$3


`javascript
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)

---

$3


`javascript
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)

---

$3


`javascript
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)

---

$3


`javascript
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 (required)
- params: Array (required)
- body: BlockStatement (required)
- generator: boolean (default: false)
- async: boolean (default: false)
- returnType (default: null)
- typeParameters (default: null)

---

$3


`javascript
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 (required)
- body: BlockStatement (required)
- generator: boolean (default: false)
- async: boolean (default: false)
- returnType (default: null)
- typeParameters (default: null)

---

$3


`javascript
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)

---

$3


`javascript
t.functionTypeParam(name, typeAnnotation)
`

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

Aliases: Flow

- name (required)
- typeAnnotation (required)

---

$3


`javascript
t.genericTypeAnnotation(id, typeParameters)
`

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

Aliases: Flow

- id (required)
- typeParameters (required)

---

$3


`javascript
t.identifier(name)
`

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

Aliases: Expression, LVal

- name`string (required)
- decorators: Array (default: null)
- typeAnnotation (default: null)

---

$3

``javascript
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)

---

$3


`javascript
t.import()
`

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

Aliases: Expression


---

$3


`javascript
t.importDeclaration(specifiers, source)
`

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

Aliases: Statement, Declaration, ModuleDeclaration

- specifiers: Array (required)
- source: StringLiteral (required)

---

$3


`javascript
t.importDefaultSpecifier(local)
`

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

Aliases: ModuleSpecifier

- local: Identifier (required)

---

$3


`javascript
t.importNamespaceSpecifier(local)
`

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

Aliases: ModuleSpecifier

- local: Identifier (required)

---

$3


`javascript
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)

---

$3


`javascript
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)

---

$3


`javascript
t.interfaceExtends(id, typeParameters)
`

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

Aliases: Flow

- id (required)
- typeParameters (required)

---

$3


`javascript
t.intersectionTypeAnnotation(types)
`

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

Aliases: Flow

- types (required)

---

$3


`javascript
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)

---

$3


`javascript
t.jSXClosingElement(name)
`

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

Aliases: JSX, Immutable

- name: JSXIdentifier | JSXMemberExpression (required)

---

$3


`javascript
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 (required)
- selfClosing (required)

---

$3


`javascript
t.jSXEmptyExpression()
`

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

Aliases: JSX, Expression


---

$3


`javascript
t.jSXExpressionContainer(expression)
`

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

Aliases: JSX, Immutable

- expression: Expression (required)

---

$3


`javascript
t.jSXIdentifier(name)
`

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

Aliases: JSX, Expression

- name: string (required)

---

$3


`javascript
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)

---

$3


`javascript
t.jSXNamespacedName(namespace, name)
`

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

Aliases: JSX

- namespace: JSXIdentifier (required)
- name: JSXIdentifier (required)

---

$3


`javascript
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 (required)
- selfClosing: boolean (default: false)

---

$3


`javascript
t.jSXSpreadAttribute(argument)
`

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

Aliases: JSX

- argument: Expression (required)

---

$3


`javascript
t.jSXSpreadChild(expression)
`

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

Aliases: JSX, Immutable

- expression: Expression (required)

---

$3


`javascript
t.jSXText(value)
`

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

Aliases: JSX, Immutable

- value: string (required)

---

$3


`javascript
t.labeledStatement(label, body)
`

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

Aliases: Statement

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

---

$3


`javascript
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)

---

$3


`javascript
t.memberExpression(object, property, computed)
`

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

Aliases: Expression, LVal

- object: Expression (required)
- propertyif computed then Expression else Identifier (required)
- computed: boolean (default: false)

---

$3


`javascript
t.metaProperty(meta, property)
`

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

Aliases: Expression

- meta: string (required)
- property: string (required)

---

$3


`javascript
t.mixedTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.newExpression(callee, arguments)
`

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

Aliases: Expression

- callee: Expression (required)
- arguments: Array (required)

---

$3


`javascript
t.noop()
`

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


---

$3


`javascript
t.nullLiteral()
`

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

Aliases: Expression, Pureish, Literal, Immutable


---

$3


`javascript
t.nullLiteralTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.nullableTypeAnnotation(typeAnnotation)
`

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

Aliases: Flow

- typeAnnotation (required)

---

$3


`javascript
t.numberTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.numericLiteral(value)
`

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

Aliases: Expression, Pureish, Literal, Immutable

- value: number (required)

---

$3


`javascript
t.numericLiteralTypeAnnotation()
`

See also t.isNumericLiteralTypeAnnotation(node, opts) and t.assertNumericLiteralTypeAnnotation(node, opts).

Aliases: Flow


---

$3


`javascript
t.objectExpression(properties)
`

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

Aliases: Expression

- properties: Array (required)

---

$3


`javascript
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')
- keyif computed then Expression else Identifier | Literal (required)
- params (required)
- body: BlockStatement (required)
- computed: boolean (default: false)
- async: boolean (default: false)
- decorators: Array (default: null)
- generator: boolean (default: false)
- returnType (default: null)
- typeParameters (default: null)

---

$3


`javascript
t.objectPattern(properties, typeAnnotation)
`

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

Aliases: Pattern, LVal

- properties: Array (required)
- typeAnnotation (required)
- decorators: Array (default: null)

---

$3


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

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

Aliases: UserWhitespacable, Property, ObjectMember

- keyif computed then Expression else Identifier | Literal (required)
- value: Expression | Pattern | RestElement (required)
- computed: boolean (default: false)
- shorthand: boolean (default: false)
- decorators: Array (default: null)

---

$3


`javascript
t.objectTypeAnnotation(properties, indexers, callProperties)
`

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

Aliases: Flow

- properties (required)
- indexers (required)
- callProperties (required)

---

$3


`javascript
t.objectTypeCallProperty(value)
`

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

Aliases: Flow, UserWhitespacable

- value (required)

---

$3


`javascript
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)

---

$3


`javascript
t.objectTypeProperty(key, value)
`

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

Aliases: Flow, UserWhitespacable

- key (required)
- value (required)

---

$3


`javascript
t.objectTypeSpreadProperty(argument)
`

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

Aliases: Flow, UserWhitespacable

- argument (required)

---

$3


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

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

Aliases: Flow, FlowDeclaration, Statement, Declaration

- id (required)
- typeParameters (required)
- impltype (required)
- supertype (required)

---

$3


`javascript
t.parenthesizedExpression(expression)
`

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

Aliases: Expression, ExpressionWrapper

- expression: Expression (required)

---

$3


`javascript
t.program(body, directives)
`

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

Aliases: Scopable, BlockParent, Block, FunctionParent

- body: Array (required)
- directives: Array (default: [])

---

$3


`javascript
t.qualifiedTypeIdentifier(id, qualification)
`

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

Aliases: Flow

- id (required)
- qualification (required)

---

$3


`javascript
t.regExpLiteral(pattern, flags)
`

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

Aliases: Expression, Literal

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

---

$3


`javascript
t.restElement(argument, typeAnnotation)
`

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

Aliases: LVal

- argument: LVal (required)
- typeAnnotation (required)
- decorators: Array (default: null)

---

$3


`javascript
t.restProperty(argument)
`

See also t.isRestProperty(node, opts) and t.assertRestProperty(node, opts).

Aliases: UnaryLike

- argument: LVal (required)

---

$3


`javascript
t.returnStatement(argument)
`

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

Aliases: Statement, Terminatorless, CompletionStatement

- argument: Expression (default: null)

---

$3


`javascript
t.sequenceExpression(expressions)
`

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

Aliases: Expression

- expressions: Array (required)

---

$3


`javascript
t.spreadElement(argument)
`

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

Aliases: UnaryLike

- argument: Expression (required)

---

$3


`javascript
t.spreadProperty(argument)
`

See also t.isSpreadProperty(node, opts) and t.assertSpreadProperty(node, opts).

Aliases: UnaryLike

- argument: Expression (required)

---

$3


`javascript
t.stringLiteral(value)
`

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

Aliases: Expression, Pureish, Literal, Immutable

- value: string (required)

---

$3


`javascript
t.stringLiteralTypeAnnotation()
`

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

Aliases: Flow


---

$3


`javascript
t.stringTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.super()
`

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

Aliases: Expression


---

$3


`javascript
t.switchCase(test, consequent)
`

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

- test: Expression (default: null)
- consequent: Array (required)

---

$3


`javascript
t.switchStatement(discriminant, cases)
`

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

Aliases: Statement, BlockParent, Scopable

- discriminant: Expression (required)
- cases: Array (required)

---

$3


`javascript
t.taggedTemplateExpression(tag, quasi)
`

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

Aliases: Expression

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

---

$3


`javascript
t.templateElement(value, tail)
`

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

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

---

$3


`javascript
t.templateLiteral(quasis, expressions)
`

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

Aliases: Expression, Literal

- quasis: Array (required)
- expressions: Array (required)

---

$3


`javascript
t.thisExpression()
`

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

Aliases: Expression


---

$3


`javascript
t.thisTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
t.throwStatement(argument)
`

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

Aliases: Statement, Terminatorless, CompletionStatement

- argument: Expression (required)

---

$3


`javascript
t.tryStatement(block, handler, finalizer)
`

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

Aliases: Statement

- block (required)
- handler (default: null)
- finalizer: BlockStatement (default: null)
- body: BlockStatement (default: null)

---

$3


`javascript
t.tupleTypeAnnotation(types)
`

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

Aliases: Flow

- types (required)

---

$3


`javascript
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)

---

$3


`javascript
t.typeAnnotation(typeAnnotation)
`

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

Aliases: Flow

- typeAnnotation (required)

---

$3


`javascript
t.typeCastExpression(expression, typeAnnotation)
`

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

Aliases: Flow, ExpressionWrapper, Expression

- expression (required)
- typeAnnotation (required)

---

$3


`javascript
t.typeParameter(bound)
`

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

Aliases: Flow

- bound (required)

---

$3


`javascript
t.typeParameterDeclaration(params)
`

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

Aliases: Flow

- params (required)

---

$3


`javascript
t.typeParameterInstantiation(params)
`

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

Aliases: Flow

- params (required)

---

$3


`javascript
t.typeofTypeAnnotation(argument)
`

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

Aliases: Flow

- argument (required)

---

$3


`javascript
t.unaryExpression(operator, argument, prefix)
`

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

Aliases: UnaryLike, Expression

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

---

$3


`javascript
t.unionTypeAnnotation(types)
`

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

Aliases: Flow

- types (required)

---

$3


`javascript
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)

---

$3


`javascript
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 (required)

---

$3


`javascript
t.variableDeclarator(id, init)
`

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

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

---

$3


`javascript
t.voidTypeAnnotation()
`

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

Aliases: Flow, FlowBaseAnnotation


---

$3


`javascript
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)

---

$3


`javascript
t.withStatement(object, body)
`

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

Aliases: Statement

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

---

$3


`javascript
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`)

---