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@babel/types
Advanced tools
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.
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';
}
}
});
Acorn is a small, fast, JavaScript-based JavaScript parser. It produces an abstract syntax tree similar to the one produced by @babel/types but does not include the same utilities for building or validating nodes.
Esprima is another JavaScript parser that produces an AST. It is used for static analysis and other code transformation tasks, similar to @babel/types, but it has its own API and does not provide the same helper functions for node creation and validation.
Recast is a JavaScript AST manipulation library that uses Esprima under the hood. It provides a different set of utilities for parsing, transforming, and printing code, and it preserves source formatting, which is different from @babel/types.
This module contains methods for building ASTs manually and for checking the types of AST nodes.
npm install --save-dev @babel/types
t.anyTypeAnnotation()
See also t.isAnyTypeAnnotation(node, opts)
and t.assertAnyTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
t.arrayExpression(elements)
See also t.isArrayExpression(node, opts)
and t.assertArrayExpression(node, opts)
.
Aliases: Expression
elements
: Array<null | Expression | SpreadElement>
(default: []
)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
)t.arrayTypeAnnotation(elementType)
See also t.isArrayTypeAnnotation(node, opts)
and t.assertArrayTypeAnnotation(node, opts)
.
Aliases: Flow
elementType
(required)t.arrowFunctionExpression(params, body, async)
See also t.isArrowFunctionExpression(node, opts)
and t.assertArrowFunctionExpression(node, opts)
.
Aliases: Scopable
, Function
, BlockParent
, FunctionParent
, Expression
, Pureish
params
: Array<LVal>
(required)body
: BlockStatement | Expression
(required)async
: boolean
(default: false
)expression
: boolean
(default: null
)generator
: boolean
(default: false
)returnType
: TypeAnnotation | TSTypeAnnotation | Noop
(default: null
)typeParameters
: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop
(default: null
)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)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
)t.awaitExpression(argument)
See also t.isAwaitExpression(node, opts)
and t.assertAwaitExpression(node, opts)
.
Aliases: Expression
, Terminatorless
argument
: Expression
(required)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)t.bindExpression(object, callee)
See also t.isBindExpression(node, opts)
and t.assertBindExpression(node, opts)
.
Aliases: Expression
object
(required)callee
(required)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: []
)t.booleanLiteral(value)
See also t.isBooleanLiteral(node, opts)
and t.assertBooleanLiteral(node, opts)
.
Aliases: Expression
, Pureish
, Literal
, Immutable
value
: boolean
(required)t.booleanLiteralTypeAnnotation()
See also t.isBooleanLiteralTypeAnnotation(node, opts)
and t.assertBooleanLiteralTypeAnnotation(node, opts)
.
Aliases: Flow
t.booleanTypeAnnotation()
See also t.isBooleanTypeAnnotation(node, opts)
and t.assertBooleanTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
t.breakStatement(label)
See also t.isBreakStatement(node, opts)
and t.assertBreakStatement(node, opts)
.
Aliases: Statement
, Terminatorless
, CompletionStatement
label
: Identifier
(default: null
)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 | TSTypeParameterInstantiation
(default: null
)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)t.classBody(body)
See also t.isClassBody(node, opts)
and t.assertClassBody(node, opts)
.
body
: Array<ClassMethod | ClassProperty | TSDeclareMethod | TSIndexSignature>
(required)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 | TSTypeParameterInstantiation
(default: null
)typeParameters
: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop
(default: null
)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 | TSTypeParameterInstantiation
(default: null
)typeParameters
: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop
(default: null
)t.classImplements(id, typeParameters)
See also t.isClassImplements(node, opts)
and t.assertClassImplements(node, opts)
.
Aliases: Flow
id
(required)typeParameters
(required)t.classMethod(kind, key, params, body, computed, static)
See also t.isClassMethod(node, opts)
and t.assertClassMethod(node, opts)
.
Aliases: Function
, Scopable
, BlockParent
, FunctionParent
, Method
kind
: "get" | "set" | "method" | "constructor"
(default: 'method'
)key
: if computed then Expression
else Identifier | Literal
(required)params
: Array<LVal>
(required)body
: BlockStatement
(required)computed
: boolean
(default: false
)static
: boolean
(default: null
)abstract
: boolean
(default: null
)access
: "public" | "private" | "protected"
(default: null
)accessibility
: "public" | "private" | "protected"
(default: null
)async
: boolean
(default: false
)decorators
: Array<Decorator>
(default: null
)generator
: boolean
(default: false
)optional
: boolean
(default: null
)returnType
: TypeAnnotation | TSTypeAnnotation | Noop
(default: null
)typeParameters
: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop
(default: null
)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
)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)t.continueStatement(label)
See also t.isContinueStatement(node, opts)
and t.assertContinueStatement(node, opts)
.
Aliases: Statement
, Terminatorless
, CompletionStatement
label
: Identifier
(default: null
)t.debuggerStatement()
See also t.isDebuggerStatement(node, opts)
and t.assertDebuggerStatement(node, opts)
.
Aliases: Statement
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)t.declareExportAllDeclaration(source)
See also t.isDeclareExportAllDeclaration(node, opts)
and t.assertDeclareExportAllDeclaration(node, opts)
.
Aliases: Flow
, FlowDeclaration
, Statement
, Declaration
source
(required)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)t.declareFunction(id)
See also t.isDeclareFunction(node, opts)
and t.assertDeclareFunction(node, opts)
.
Aliases: Flow
, FlowDeclaration
, Statement
, Declaration
id
(required)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)t.declareModule(id, body)
See also t.isDeclareModule(node, opts)
and t.assertDeclareModule(node, opts)
.
Aliases: Flow
, FlowDeclaration
, Statement
, Declaration
id
(required)body
(required)t.declareModuleExports(typeAnnotation)
See also t.isDeclareModuleExports(node, opts)
and t.assertDeclareModuleExports(node, opts)
.
Aliases: Flow
, FlowDeclaration
, Statement
, Declaration
typeAnnotation
(required)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)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)t.declareVariable(id)
See also t.isDeclareVariable(node, opts)
and t.assertDeclareVariable(node, opts)
.
Aliases: Flow
, FlowDeclaration
, Statement
, Declaration
id
(required)t.declaredPredicate(value)
See also t.isDeclaredPredicate(node, opts)
and t.assertDeclaredPredicate(node, opts)
.
Aliases: Flow
, FlowPredicate
value
(required)t.decorator(expression)
See also t.isDecorator(node, opts)
and t.assertDecorator(node, opts)
.
expression
: Expression
(required)t.directive(value)
See also t.isDirective(node, opts)
and t.assertDirective(node, opts)
.
value
: DirectiveLiteral
(required)t.directiveLiteral(value)
See also t.isDirectiveLiteral(node, opts)
and t.assertDirectiveLiteral(node, opts)
.
value
: string
(required)t.doExpression(body)
See also t.isDoExpression(node, opts)
and t.assertDoExpression(node, opts)
.
Aliases: Expression
body
: BlockStatement
(required)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)t.emptyStatement()
See also t.isEmptyStatement(node, opts)
and t.assertEmptyStatement(node, opts)
.
Aliases: Statement
t.emptyTypeAnnotation()
See also t.isEmptyTypeAnnotation(node, opts)
and t.assertEmptyTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
t.existsTypeAnnotation()
See also t.isExistsTypeAnnotation(node, opts)
and t.assertExistsTypeAnnotation(node, opts)
.
Aliases: Flow
t.exportAllDeclaration(source)
See also t.isExportAllDeclaration(node, opts)
and t.assertExportAllDeclaration(node, opts)
.
Aliases: Statement
, Declaration
, ModuleDeclaration
, ExportDeclaration
source
: StringLiteral
(required)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)t.exportDefaultSpecifier(exported)
See also t.isExportDefaultSpecifier(node, opts)
and t.assertExportDefaultSpecifier(node, opts)
.
Aliases: ModuleSpecifier
exported
: Identifier
(required)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
)t.exportNamespaceSpecifier(exported)
See also t.isExportNamespaceSpecifier(node, opts)
and t.assertExportNamespaceSpecifier(node, opts)
.
Aliases: ModuleSpecifier
exported
: Identifier
(required)t.exportSpecifier(local, exported)
See also t.isExportSpecifier(node, opts)
and t.assertExportSpecifier(node, opts)
.
Aliases: ModuleSpecifier
local
: Identifier
(required)exported
: Identifier
(required)t.expressionStatement(expression)
See also t.isExpressionStatement(node, opts)
and t.assertExpressionStatement(node, opts)
.
Aliases: Statement
, ExpressionWrapper
expression
: Expression
(required)t.file(program, comments, tokens)
See also t.isFile(node, opts)
and t.assertFile(node, opts)
.
program
: Program
(required)comments
(required)tokens
(required)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)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
)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)t.functionDeclaration(id, params, body, generator, async)
See also t.isFunctionDeclaration(node, opts)
and t.assertFunctionDeclaration(node, opts)
.
Aliases: Scopable
, Function
, BlockParent
, FunctionParent
, Statement
, Pureish
, Declaration
id
: Identifier
(default: null
)params
: Array<LVal>
(required)body
: BlockStatement
(required)generator
: boolean
(default: false
)async
: boolean
(default: false
)declare
: boolean
(default: null
)returnType
: TypeAnnotation | TSTypeAnnotation | Noop
(default: null
)typeParameters
: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop
(default: null
)t.functionExpression(id, params, body, generator, async)
See also t.isFunctionExpression(node, opts)
and t.assertFunctionExpression(node, opts)
.
Aliases: Scopable
, Function
, BlockParent
, FunctionParent
, Expression
, Pureish
id
: Identifier
(default: null
)params
: Array<LVal>
(required)body
: BlockStatement
(required)generator
: boolean
(default: false
)async
: boolean
(default: false
)returnType
: TypeAnnotation | TSTypeAnnotation | Noop
(default: null
)typeParameters
: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop
(default: null
)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)t.functionTypeParam(name, typeAnnotation)
See also t.isFunctionTypeParam(node, opts)
and t.assertFunctionTypeParam(node, opts)
.
Aliases: Flow
name
(required)typeAnnotation
(required)t.genericTypeAnnotation(id, typeParameters)
See also t.isGenericTypeAnnotation(node, opts)
and t.assertGenericTypeAnnotation(node, opts)
.
Aliases: Flow
id
(required)typeParameters
(required)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
)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
)t.import()
See also t.isImport(node, opts)
and t.assertImport(node, opts)
.
Aliases: Expression
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)t.importDefaultSpecifier(local)
See also t.isImportDefaultSpecifier(node, opts)
and t.assertImportDefaultSpecifier(node, opts)
.
Aliases: ModuleSpecifier
local
: Identifier
(required)t.importNamespaceSpecifier(local)
See also t.isImportNamespaceSpecifier(node, opts)
and t.assertImportNamespaceSpecifier(node, opts)
.
Aliases: ModuleSpecifier
local
: Identifier
(required)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
)t.inferredPredicate()
See also t.isInferredPredicate(node, opts)
and t.assertInferredPredicate(node, opts)
.
Aliases: Flow
, FlowPredicate
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)t.interfaceExtends(id, typeParameters)
See also t.isInterfaceExtends(node, opts)
and t.assertInterfaceExtends(node, opts)
.
Aliases: Flow
id
(required)typeParameters
(required)t.intersectionTypeAnnotation(types)
See also t.isIntersectionTypeAnnotation(node, opts)
and t.assertIntersectionTypeAnnotation(node, opts)
.
Aliases: Flow
types
(required)t.jSXAttribute(name, value)
See also t.isJSXAttribute(node, opts)
and t.assertJSXAttribute(node, opts)
.
Aliases: JSX
, Immutable
name
: JSXIdentifier | JSXNamespacedName
(required)value
: JSXElement | JSXFragment | StringLiteral | JSXExpressionContainer
(default: null
)t.jSXClosingElement(name)
See also t.isJSXClosingElement(node, opts)
and t.assertJSXClosingElement(node, opts)
.
Aliases: JSX
, Immutable
name
: JSXIdentifier | JSXMemberExpression
(required)t.jSXClosingFragment()
See also t.isJSXClosingFragment(node, opts)
and t.assertJSXClosingFragment(node, opts)
.
Aliases: JSX
, Immutable
t.jSXElement(openingElement, closingElement, children, selfClosing)
See also t.isJSXElement(node, opts)
and t.assertJSXElement(node, opts)
.
Aliases: JSX
, Immutable
, Expression
openingElement
: JSXOpeningElement
(required)closingElement
: JSXClosingElement
(default: null
)children
: Array<JSXText | JSXExpressionContainer | JSXSpreadChild | JSXElement | JSXFragment>
(required)selfClosing
(required)t.jSXEmptyExpression()
See also t.isJSXEmptyExpression(node, opts)
and t.assertJSXEmptyExpression(node, opts)
.
Aliases: JSX
t.jSXExpressionContainer(expression)
See also t.isJSXExpressionContainer(node, opts)
and t.assertJSXExpressionContainer(node, opts)
.
Aliases: JSX
, Immutable
expression
: Expression
(required)t.jSXFragment(openingFragment, closingFragment, children)
See also t.isJSXFragment(node, opts)
and t.assertJSXFragment(node, opts)
.
Aliases: JSX
, Immutable
, Expression
openingFragment
: JSXOpeningFragment
(required)closingFragment
: JSXClosingFragment
(required)children
: Array<JSXText | JSXExpressionContainer | JSXSpreadChild | JSXElement | JSXFragment>
(required)t.jSXIdentifier(name)
See also t.isJSXIdentifier(node, opts)
and t.assertJSXIdentifier(node, opts)
.
Aliases: JSX
name
: string
(required)t.jSXMemberExpression(object, property)
See also t.isJSXMemberExpression(node, opts)
and t.assertJSXMemberExpression(node, opts)
.
Aliases: JSX
object
: JSXMemberExpression | JSXIdentifier
(required)property
: JSXIdentifier
(required)t.jSXNamespacedName(namespace, name)
See also t.isJSXNamespacedName(node, opts)
and t.assertJSXNamespacedName(node, opts)
.
Aliases: JSX
namespace
: JSXIdentifier
(required)name
: JSXIdentifier
(required)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
)t.jSXOpeningFragment()
See also t.isJSXOpeningFragment(node, opts)
and t.assertJSXOpeningFragment(node, opts)
.
Aliases: JSX
, Immutable
t.jSXSpreadAttribute(argument)
See also t.isJSXSpreadAttribute(node, opts)
and t.assertJSXSpreadAttribute(node, opts)
.
Aliases: JSX
argument
: Expression
(required)t.jSXSpreadChild(expression)
See also t.isJSXSpreadChild(node, opts)
and t.assertJSXSpreadChild(node, opts)
.
Aliases: JSX
, Immutable
expression
: Expression
(required)t.jSXText(value)
See also t.isJSXText(node, opts)
and t.assertJSXText(node, opts)
.
Aliases: JSX
, Immutable
value
: string
(required)t.labeledStatement(label, body)
See also t.isLabeledStatement(node, opts)
and t.assertLabeledStatement(node, opts)
.
Aliases: Statement
label
: Identifier
(required)body
: Statement
(required)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)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
)t.metaProperty(meta, property)
See also t.isMetaProperty(node, opts)
and t.assertMetaProperty(node, opts)
.
Aliases: Expression
meta
: Identifier
(required)property
: Identifier
(required)t.mixedTypeAnnotation()
See also t.isMixedTypeAnnotation(node, opts)
and t.assertMixedTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
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 | TSTypeParameterInstantiation
(default: null
)t.noop()
See also t.isNoop(node, opts)
and t.assertNoop(node, opts)
.
t.nullLiteral()
See also t.isNullLiteral(node, opts)
and t.assertNullLiteral(node, opts)
.
Aliases: Expression
, Pureish
, Literal
, Immutable
t.nullLiteralTypeAnnotation()
See also t.isNullLiteralTypeAnnotation(node, opts)
and t.assertNullLiteralTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
t.nullableTypeAnnotation(typeAnnotation)
See also t.isNullableTypeAnnotation(node, opts)
and t.assertNullableTypeAnnotation(node, opts)
.
Aliases: Flow
typeAnnotation
(required)t.numberLiteralTypeAnnotation()
See also t.isNumberLiteralTypeAnnotation(node, opts)
and t.assertNumberLiteralTypeAnnotation(node, opts)
.
Aliases: Flow
t.numberTypeAnnotation()
See also t.isNumberTypeAnnotation(node, opts)
and t.assertNumberTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
t.numericLiteral(value)
See also t.isNumericLiteral(node, opts)
and t.assertNumericLiteral(node, opts)
.
Aliases: Expression
, Pureish
, Literal
, Immutable
value
: number
(required)t.objectExpression(properties)
See also t.isObjectExpression(node, opts)
and t.assertObjectExpression(node, opts)
.
Aliases: Expression
properties
: Array<ObjectMethod | ObjectProperty | SpreadElement>
(required)t.objectMethod(kind, key, params, body, computed)
See also t.isObjectMethod(node, opts)
and t.assertObjectMethod(node, opts)
.
Aliases: UserWhitespacable
, Function
, Scopable
, BlockParent
, FunctionParent
, Method
, ObjectMember
kind
: "method" | "get" | "set"
(default: 'method'
)key
: if computed then Expression
else Identifier | Literal
(required)params
: Array<LVal>
(required)body
: BlockStatement
(required)computed
: boolean
(default: false
)async
: boolean
(default: false
)decorators
: Array<Decorator>
(default: null
)generator
: boolean
(default: false
)returnType
: TypeAnnotation | TSTypeAnnotation | Noop
(default: null
)typeParameters
: TypeParameterDeclaration | TSTypeParameterDeclaration | Noop
(default: null
)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
)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
)t.objectTypeAnnotation(properties, indexers, callProperties)
See also t.isObjectTypeAnnotation(node, opts)
and t.assertObjectTypeAnnotation(node, opts)
.
Aliases: Flow
properties
(required)indexers
(required)callProperties
(required)t.objectTypeCallProperty(value)
See also t.isObjectTypeCallProperty(node, opts)
and t.assertObjectTypeCallProperty(node, opts)
.
Aliases: Flow
, UserWhitespacable
value
(required)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)t.objectTypeProperty(key, value)
See also t.isObjectTypeProperty(node, opts)
and t.assertObjectTypeProperty(node, opts)
.
Aliases: Flow
, UserWhitespacable
key
(required)value
(required)t.objectTypeSpreadProperty(argument)
See also t.isObjectTypeSpreadProperty(node, opts)
and t.assertObjectTypeSpreadProperty(node, opts)
.
Aliases: Flow
, UserWhitespacable
argument
(required)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)t.parenthesizedExpression(expression)
See also t.isParenthesizedExpression(node, opts)
and t.assertParenthesizedExpression(node, opts)
.
Aliases: Expression
, ExpressionWrapper
expression
: Expression
(required)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
)t.qualifiedTypeIdentifier(id, qualification)
See also t.isQualifiedTypeIdentifier(node, opts)
and t.assertQualifiedTypeIdentifier(node, opts)
.
Aliases: Flow
id
(required)qualification
(required)t.regExpLiteral(pattern, flags)
See also t.isRegExpLiteral(node, opts)
and t.assertRegExpLiteral(node, opts)
.
Aliases: Expression
, Literal
pattern
: string
(required)flags
: string
(default: ''
)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
)t.returnStatement(argument)
See also t.isReturnStatement(node, opts)
and t.assertReturnStatement(node, opts)
.
Aliases: Statement
, Terminatorless
, CompletionStatement
argument
: Expression
(default: null
)t.sequenceExpression(expressions)
See also t.isSequenceExpression(node, opts)
and t.assertSequenceExpression(node, opts)
.
Aliases: Expression
expressions
: Array<Expression>
(required)t.spreadElement(argument)
See also t.isSpreadElement(node, opts)
and t.assertSpreadElement(node, opts)
.
Aliases: UnaryLike
argument
: Expression
(required)t.stringLiteral(value)
See also t.isStringLiteral(node, opts)
and t.assertStringLiteral(node, opts)
.
Aliases: Expression
, Pureish
, Literal
, Immutable
value
: string
(required)t.stringLiteralTypeAnnotation()
See also t.isStringLiteralTypeAnnotation(node, opts)
and t.assertStringLiteralTypeAnnotation(node, opts)
.
Aliases: Flow
t.stringTypeAnnotation()
See also t.isStringTypeAnnotation(node, opts)
and t.assertStringTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
t.super()
See also t.isSuper(node, opts)
and t.assertSuper(node, opts)
.
Aliases: Expression
t.switchCase(test, consequent)
See also t.isSwitchCase(node, opts)
and t.assertSwitchCase(node, opts)
.
test
: Expression
(default: null
)consequent
: Array<Statement>
(required)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)t.tSAnyKeyword()
See also t.isTSAnyKeyword(node, opts)
and t.assertTSAnyKeyword(node, opts)
.
Aliases: TSType
t.tSArrayType(elementType)
See also t.isTSArrayType(node, opts)
and t.assertTSArrayType(node, opts)
.
Aliases: TSType
elementType
: TSType
(required)t.tSAsExpression(expression, typeAnnotation)
See also t.isTSAsExpression(node, opts)
and t.assertTSAsExpression(node, opts)
.
Aliases: Expression
expression
: Expression
(required)typeAnnotation
: TSType
(required)t.tSBooleanKeyword()
See also t.isTSBooleanKeyword(node, opts)
and t.assertTSBooleanKeyword(node, opts)
.
Aliases: TSType
t.tSCallSignatureDeclaration(typeParameters, parameters, typeAnnotation)
See also t.isTSCallSignatureDeclaration(node, opts)
and t.assertTSCallSignatureDeclaration(node, opts)
.
Aliases: TSTypeElement
typeParameters
: TSTypeParameterDeclaration
(default: null
)parameters
: Array<Identifier | RestElement>
(default: null
)typeAnnotation
: TSTypeAnnotation
(default: null
)t.tSConstructSignatureDeclaration(typeParameters, parameters, typeAnnotation)
See also t.isTSConstructSignatureDeclaration(node, opts)
and t.assertTSConstructSignatureDeclaration(node, opts)
.
Aliases: TSTypeElement
typeParameters
: TSTypeParameterDeclaration
(default: null
)parameters
: Array<Identifier | RestElement>
(default: null
)typeAnnotation
: TSTypeAnnotation
(default: null
)t.tSConstructorType(typeParameters, typeAnnotation)
See also t.isTSConstructorType(node, opts)
and t.assertTSConstructorType(node, opts)
.
Aliases: TSType
typeParameters
: TSTypeParameterDeclaration
(default: null
)typeAnnotation
: TSTypeAnnotation
(default: null
)parameters
: Array<Identifier | RestElement>
(default: null
)t.tSDeclareFunction(id, typeParameters, params, returnType)
See also t.isTSDeclareFunction(node, opts)
and t.assertTSDeclareFunction(node, opts)
.
Aliases: Statement
, Declaration
id
: Identifier
(default: null
)typeParameters
: TSTypeParameterDeclaration | Noop
(default: null
)params
: Array<LVal>
(required)returnType
: TSTypeAnnotation | Noop
(default: null
)async
: boolean
(default: false
)declare
: boolean
(default: null
)generator
: boolean
(default: false
)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
: TSTypeParameterDeclaration | Noop
(default: null
)params
: Array<LVal>
(required)returnType
: TSTypeAnnotation | Noop
(default: null
)abstract
: boolean
(default: null
)access
: "public" | "private" | "protected"
(default: null
)accessibility
: "public" | "private" | "protected"
(default: null
)async
: boolean
(default: false
)computed
: boolean
(default: false
)generator
: boolean
(default: false
)kind
: "get" | "set" | "method" | "constructor"
(default: 'method'
)optional
: boolean
(default: null
)static
: boolean
(default: null
)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
)t.tSEnumMember(id, initializer)
See also t.isTSEnumMember(node, opts)
and t.assertTSEnumMember(node, opts)
.
id
: Identifier | StringLiteral
(required)initializer
: Expression
(default: null
)t.tSExportAssignment(expression)
See also t.isTSExportAssignment(node, opts)
and t.assertTSExportAssignment(node, opts)
.
Aliases: Statement
expression
: Expression
(required)t.tSExpressionWithTypeArguments(expression, typeParameters)
See also t.isTSExpressionWithTypeArguments(node, opts)
and t.assertTSExpressionWithTypeArguments(node, opts)
.
Aliases: TSType
expression
: TSEntityName
(required)typeParameters
: TSTypeParameterInstantiation
(default: null
)t.tSExternalModuleReference(expression)
See also t.isTSExternalModuleReference(node, opts)
and t.assertTSExternalModuleReference(node, opts)
.
expression
: StringLiteral
(required)t.tSFunctionType(typeParameters, typeAnnotation)
See also t.isTSFunctionType(node, opts)
and t.assertTSFunctionType(node, opts)
.
Aliases: TSType
typeParameters
: TSTypeParameterDeclaration
(default: null
)typeAnnotation
: TSTypeAnnotation
(default: null
)parameters
: Array<Identifier | RestElement>
(default: null
)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
)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
)t.tSIndexedAccessType(objectType, indexType)
See also t.isTSIndexedAccessType(node, opts)
and t.assertTSIndexedAccessType(node, opts)
.
Aliases: TSType
objectType
: TSType
(required)indexType
: TSType
(required)t.tSInterfaceBody(body)
See also t.isTSInterfaceBody(node, opts)
and t.assertTSInterfaceBody(node, opts)
.
body
: Array<TSTypeElement>
(required)t.tSInterfaceDeclaration(id, typeParameters, extends, body)
See also t.isTSInterfaceDeclaration(node, opts)
and t.assertTSInterfaceDeclaration(node, opts)
.
Aliases: Statement
, Declaration
id
: Identifier
(required)typeParameters
: TSTypeParameterDeclaration
(default: null
)extends
: Array<TSExpressionWithTypeArguments>
(default: null
)body
: TSInterfaceBody
(required)declare
: boolean
(default: null
)t.tSIntersectionType(types)
See also t.isTSIntersectionType(node, opts)
and t.assertTSIntersectionType(node, opts)
.
Aliases: TSType
types
: Array<TSType>
(required)t.tSLiteralType(literal)
See also t.isTSLiteralType(node, opts)
and t.assertTSLiteralType(node, opts)
.
Aliases: TSType
literal
: NumericLiteral | StringLiteral | BooleanLiteral
(required)t.tSMappedType(typeParameter, typeAnnotation)
See also t.isTSMappedType(node, opts)
and t.assertTSMappedType(node, opts)
.
Aliases: TSType
typeParameter
: TSTypeParameter
(required)typeAnnotation
: TSType
(default: null
)optional
: boolean
(default: null
)readonly
: boolean
(default: null
)t.tSMethodSignature(key, typeParameters, parameters, typeAnnotation)
See also t.isTSMethodSignature(node, opts)
and t.assertTSMethodSignature(node, opts)
.
Aliases: TSTypeElement
key
: Expression
(required)typeParameters
: TSTypeParameterDeclaration
(default: null
)parameters
: Array<Identifier | RestElement>
(default: null
)typeAnnotation
: TSTypeAnnotation
(default: null
)computed
: boolean
(default: null
)optional
: boolean
(default: null
)t.tSModuleBlock(body)
See also t.isTSModuleBlock(node, opts)
and t.assertTSModuleBlock(node, opts)
.
body
: Array<Statement>
(required)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
)t.tSNamespaceExportDeclaration(id)
See also t.isTSNamespaceExportDeclaration(node, opts)
and t.assertTSNamespaceExportDeclaration(node, opts)
.
Aliases: Statement
id
: Identifier
(required)t.tSNeverKeyword()
See also t.isTSNeverKeyword(node, opts)
and t.assertTSNeverKeyword(node, opts)
.
Aliases: TSType
t.tSNonNullExpression(expression)
See also t.isTSNonNullExpression(node, opts)
and t.assertTSNonNullExpression(node, opts)
.
Aliases: Expression
expression
: Expression
(required)t.tSNullKeyword()
See also t.isTSNullKeyword(node, opts)
and t.assertTSNullKeyword(node, opts)
.
Aliases: TSType
t.tSNumberKeyword()
See also t.isTSNumberKeyword(node, opts)
and t.assertTSNumberKeyword(node, opts)
.
Aliases: TSType
t.tSObjectKeyword()
See also t.isTSObjectKeyword(node, opts)
and t.assertTSObjectKeyword(node, opts)
.
Aliases: TSType
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
)t.tSParenthesizedType(typeAnnotation)
See also t.isTSParenthesizedType(node, opts)
and t.assertTSParenthesizedType(node, opts)
.
Aliases: TSType
typeAnnotation
: TSType
(required)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
)t.tSQualifiedName(left, right)
See also t.isTSQualifiedName(node, opts)
and t.assertTSQualifiedName(node, opts)
.
Aliases: TSEntityName
left
: TSEntityName
(required)right
: Identifier
(required)t.tSStringKeyword()
See also t.isTSStringKeyword(node, opts)
and t.assertTSStringKeyword(node, opts)
.
Aliases: TSType
t.tSSymbolKeyword()
See also t.isTSSymbolKeyword(node, opts)
and t.assertTSSymbolKeyword(node, opts)
.
Aliases: TSType
t.tSThisType()
See also t.isTSThisType(node, opts)
and t.assertTSThisType(node, opts)
.
Aliases: TSType
t.tSTupleType(elementTypes)
See also t.isTSTupleType(node, opts)
and t.assertTSTupleType(node, opts)
.
Aliases: TSType
elementTypes
: Array<TSType>
(required)t.tSTypeAliasDeclaration(id, typeParameters, typeAnnotation)
See also t.isTSTypeAliasDeclaration(node, opts)
and t.assertTSTypeAliasDeclaration(node, opts)
.
Aliases: Statement
, Declaration
id
: Identifier
(required)typeParameters
: TSTypeParameterDeclaration
(default: null
)typeAnnotation
: TSType
(required)declare
: boolean
(default: null
)t.tSTypeAnnotation(typeAnnotation)
See also t.isTSTypeAnnotation(node, opts)
and t.assertTSTypeAnnotation(node, opts)
.
typeAnnotation
: TSType
(required)t.tSTypeAssertion(typeAnnotation, expression)
See also t.isTSTypeAssertion(node, opts)
and t.assertTSTypeAssertion(node, opts)
.
Aliases: Expression
typeAnnotation
: TSType
(required)expression
: Expression
(required)t.tSTypeLiteral(members)
See also t.isTSTypeLiteral(node, opts)
and t.assertTSTypeLiteral(node, opts)
.
Aliases: TSType
members
: Array<TSTypeElement>
(required)t.tSTypeOperator(typeAnnotation)
See also t.isTSTypeOperator(node, opts)
and t.assertTSTypeOperator(node, opts)
.
Aliases: TSType
typeAnnotation
: TSType
(required)operator
: string
(default: null
)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
)t.tSTypeParameterDeclaration(params)
See also t.isTSTypeParameterDeclaration(node, opts)
and t.assertTSTypeParameterDeclaration(node, opts)
.
params
: Array<TSTypeParameter>
(required)t.tSTypeParameterInstantiation(params)
See also t.isTSTypeParameterInstantiation(node, opts)
and t.assertTSTypeParameterInstantiation(node, opts)
.
params
: Array<TSType>
(required)t.tSTypePredicate(parameterName, typeAnnotation)
See also t.isTSTypePredicate(node, opts)
and t.assertTSTypePredicate(node, opts)
.
Aliases: TSType
parameterName
: Identifier | TSThisType
(required)typeAnnotation
: TSTypeAnnotation
(required)t.tSTypeQuery(exprName)
See also t.isTSTypeQuery(node, opts)
and t.assertTSTypeQuery(node, opts)
.
Aliases: TSType
exprName
: TSEntityName
(required)t.tSTypeReference(typeName, typeParameters)
See also t.isTSTypeReference(node, opts)
and t.assertTSTypeReference(node, opts)
.
Aliases: TSType
typeName
: TSEntityName
(required)typeParameters
: TSTypeParameterInstantiation
(default: null
)t.tSUndefinedKeyword()
See also t.isTSUndefinedKeyword(node, opts)
and t.assertTSUndefinedKeyword(node, opts)
.
Aliases: TSType
t.tSUnionType(types)
See also t.isTSUnionType(node, opts)
and t.assertTSUnionType(node, opts)
.
Aliases: TSType
types
: Array<TSType>
(required)t.tSVoidKeyword()
See also t.isTSVoidKeyword(node, opts)
and t.assertTSVoidKeyword(node, opts)
.
Aliases: TSType
t.taggedTemplateExpression(tag, quasi)
See also t.isTaggedTemplateExpression(node, opts)
and t.assertTaggedTemplateExpression(node, opts)
.
Aliases: Expression
tag
: Expression
(required)quasi
: TemplateLiteral
(required)t.templateElement(value, tail)
See also t.isTemplateElement(node, opts)
and t.assertTemplateElement(node, opts)
.
value
(required)tail
: boolean
(default: false
)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)t.thisExpression()
See also t.isThisExpression(node, opts)
and t.assertThisExpression(node, opts)
.
Aliases: Expression
t.thisTypeAnnotation()
See also t.isThisTypeAnnotation(node, opts)
and t.assertThisTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
t.throwStatement(argument)
See also t.isThrowStatement(node, opts)
and t.assertThrowStatement(node, opts)
.
Aliases: Statement
, Terminatorless
, CompletionStatement
argument
: Expression
(required)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
)t.tupleTypeAnnotation(types)
See also t.isTupleTypeAnnotation(node, opts)
and t.assertTupleTypeAnnotation(node, opts)
.
Aliases: Flow
types
(required)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)t.typeAnnotation(typeAnnotation)
See also t.isTypeAnnotation(node, opts)
and t.assertTypeAnnotation(node, opts)
.
Aliases: Flow
typeAnnotation
: Flow
(required)t.typeCastExpression(expression, typeAnnotation)
See also t.isTypeCastExpression(node, opts)
and t.assertTypeCastExpression(node, opts)
.
Aliases: Flow
, ExpressionWrapper
, Expression
expression
(required)typeAnnotation
(required)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
)t.typeParameterDeclaration(params)
See also t.isTypeParameterDeclaration(node, opts)
and t.assertTypeParameterDeclaration(node, opts)
.
Aliases: Flow
params
: Array<TypeParameter>
(required)t.typeParameterInstantiation(params)
See also t.isTypeParameterInstantiation(node, opts)
and t.assertTypeParameterInstantiation(node, opts)
.
Aliases: Flow
params
: Array<Flow>
(required)t.typeofTypeAnnotation(argument)
See also t.isTypeofTypeAnnotation(node, opts)
and t.assertTypeofTypeAnnotation(node, opts)
.
Aliases: Flow
argument
(required)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
)t.unionTypeAnnotation(types)
See also t.isUnionTypeAnnotation(node, opts)
and t.assertUnionTypeAnnotation(node, opts)
.
Aliases: Flow
types
(required)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
)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
)t.variableDeclarator(id, init)
See also t.isVariableDeclarator(node, opts)
and t.assertVariableDeclarator(node, opts)
.
id
: LVal
(required)init
: Expression
(default: null
)t.voidTypeAnnotation()
See also t.isVoidTypeAnnotation(node, opts)
and t.assertVoidTypeAnnotation(node, opts)
.
Aliases: Flow
, FlowBaseAnnotation
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)t.withStatement(object, body)
See also t.isWithStatement(node, opts)
and t.assertWithStatement(node, opts)
.
Aliases: Statement
object
: Expression
(required)body
: BlockStatement | Statement
(required)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
Babel Types is a Lodash-esque utility library for AST nodes
The npm package @babel/types receives a total of 52,462,404 weekly downloads. As such, @babel/types popularity was classified as popular.
We found that @babel/types demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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