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export interface Node {
start: number
end: number
type: string
range?: [number, number]
loc?: SourceLocation | null
}
export interface SourceLocation {
source?: string | null
start: Position
end: Position
}
export interface Position {
/** 1-based */
line: number
/** 0-based */
column: number
}
export interface Identifier extends Node {
type: "Identifier"
name: string
}
export interface Literal extends Node {
type: "Literal"
value?: string | boolean | null | number | RegExp | bigint
raw?: string
regex?: {
pattern: string
flags: string
}
bigint?: string
}
export interface Program extends Node {
type: "Program"
body: Array<Statement | ModuleDeclaration>
sourceType: "script" | "module"
}
export interface Function extends Node {
id?: Identifier | null
params: Array<Pattern>
body: BlockStatement | Expression
generator: boolean
expression: boolean
async: boolean
}
export interface ExpressionStatement extends Node {
type: "ExpressionStatement"
expression: Expression | Literal
directive?: string
}
export interface BlockStatement extends Node {
type: "BlockStatement"
body: Array<Statement>
}
export interface EmptyStatement extends Node {
type: "EmptyStatement"
}
export interface DebuggerStatement extends Node {
type: "DebuggerStatement"
}
export interface WithStatement extends Node {
type: "WithStatement"
object: Expression
body: Statement
}
export interface ReturnStatement extends Node {
type: "ReturnStatement"
argument?: Expression | null
}
export interface LabeledStatement extends Node {
type: "LabeledStatement"
label: Identifier
body: Statement
}
export interface BreakStatement extends Node {
type: "BreakStatement"
label?: Identifier | null
}
export interface ContinueStatement extends Node {
type: "ContinueStatement"
label?: Identifier | null
}
export interface IfStatement extends Node {
type: "IfStatement"
test: Expression
consequent: Statement
alternate?: Statement | null
}
export interface SwitchStatement extends Node {
type: "SwitchStatement"
discriminant: Expression
cases: Array<SwitchCase>
}
export interface SwitchCase extends Node {
type: "SwitchCase"
test?: Expression | null
consequent: Array<Statement>
}
export interface ThrowStatement extends Node {
type: "ThrowStatement"
argument: Expression
}
export interface TryStatement extends Node {
type: "TryStatement"
block: BlockStatement
handler?: CatchClause | null
finalizer?: BlockStatement | null
}
export interface CatchClause extends Node {
type: "CatchClause"
param?: Pattern | null
body: BlockStatement
}
export interface WhileStatement extends Node {
type: "WhileStatement"
test: Expression
body: Statement
}
export interface DoWhileStatement extends Node {
type: "DoWhileStatement"
body: Statement
test: Expression
}
export interface ForStatement extends Node {
type: "ForStatement"
init?: VariableDeclaration | Expression | null
test?: Expression | null
update?: Expression | null
body: Statement
}
export interface ForInStatement extends Node {
type: "ForInStatement"
left: VariableDeclaration | Pattern
right: Expression
body: Statement
}
export interface FunctionDeclaration extends Function {
type: "FunctionDeclaration"
id: Identifier
body: BlockStatement
}
export interface VariableDeclaration extends Node {
type: "VariableDeclaration"
declarations: Array<VariableDeclarator>
kind: "var" | "let" | "const"
}
export interface VariableDeclarator extends Node {
type: "VariableDeclarator"
id: Pattern
init?: Expression | null
}
export interface ThisExpression extends Node {
type: "ThisExpression"
}
export interface ArrayExpression extends Node {
type: "ArrayExpression"
elements: Array<Expression | SpreadElement | null>
}
export interface ObjectExpression extends Node {
type: "ObjectExpression"
properties: Array<Property | SpreadElement>
}
export interface Property extends Node {
type: "Property"
key: Expression
value: Expression
kind: "init" | "get" | "set"
method: boolean
shorthand: boolean
computed: boolean
}
export interface FunctionExpression extends Function {
type: "FunctionExpression"
body: BlockStatement
}
export interface UnaryExpression extends Node {
type: "UnaryExpression"
operator: UnaryOperator
prefix: boolean
argument: Expression
}
export type UnaryOperator = "-" | "+" | "!" | "~" | "typeof" | "void" | "delete"
export interface UpdateExpression extends Node {
type: "UpdateExpression"
operator: UpdateOperator
argument: Expression
prefix: boolean
}
export type UpdateOperator = "++" | "--"
export interface BinaryExpression extends Node {
type: "BinaryExpression"
operator: BinaryOperator
left: Expression | PrivateIdentifier
right: Expression
}
export type BinaryOperator = "==" | "!=" | "===" | "!==" | "<" | "<=" | ">" | ">=" | "<<" | ">>" | ">>>" | "+" | "-" | "*" | "/" | "%" | "|" | "^" | "&" | "in" | "instanceof" | "**"
export interface AssignmentExpression extends Node {
type: "AssignmentExpression"
operator: AssignmentOperator
left: Pattern
right: Expression
}
export type AssignmentOperator = "=" | "+=" | "-=" | "*=" | "/=" | "%=" | "<<=" | ">>=" | ">>>=" | "|=" | "^=" | "&=" | "**=" | "||=" | "&&=" | "??="
export interface LogicalExpression extends Node {
type: "LogicalExpression"
operator: LogicalOperator
left: Expression
right: Expression
}
export type LogicalOperator = "||" | "&&" | "??"
export interface MemberExpression extends Node {
type: "MemberExpression"
object: Expression | Super
property: Expression | PrivateIdentifier
computed: boolean
optional: boolean
}
export interface ConditionalExpression extends Node {
type: "ConditionalExpression"
test: Expression
alternate: Expression
consequent: Expression
}
export interface CallExpression extends Node {
type: "CallExpression"
callee: Expression | Super
arguments: Array<Expression | SpreadElement>
optional: boolean
}
export interface NewExpression extends Node {
type: "NewExpression"
callee: Expression
arguments: Array<Expression | SpreadElement>
}
export interface SequenceExpression extends Node {
type: "SequenceExpression"
expressions: Array<Expression>
}
export interface ForOfStatement extends Node {
type: "ForOfStatement"
left: VariableDeclaration | Pattern
right: Expression
body: Statement
await: boolean
}
export interface Super extends Node {
type: "Super"
}
export interface SpreadElement extends Node {
type: "SpreadElement"
argument: Expression
}
export interface ArrowFunctionExpression extends Function {
type: "ArrowFunctionExpression"
}
export interface YieldExpression extends Node {
type: "YieldExpression"
argument?: Expression | null
delegate: boolean
}
export interface TemplateLiteral extends Node {
type: "TemplateLiteral"
quasis: Array<TemplateElement>
expressions: Array<Expression>
}
export interface TaggedTemplateExpression extends Node {
type: "TaggedTemplateExpression"
tag: Expression
quasi: TemplateLiteral
}
export interface TemplateElement extends Node {
type: "TemplateElement"
tail: boolean
value: {
cooked?: string | null
raw: string
}
}
export interface AssignmentProperty extends Node {
type: "Property"
key: Expression
value: Pattern
kind: "init"
method: false
shorthand: boolean
computed: boolean
}
export interface ObjectPattern extends Node {
type: "ObjectPattern"
properties: Array<AssignmentProperty | RestElement>
}
export interface ArrayPattern extends Node {
type: "ArrayPattern"
elements: Array<Pattern | null>
}
export interface RestElement extends Node {
type: "RestElement"
argument: Pattern
}
export interface AssignmentPattern extends Node {
type: "AssignmentPattern"
left: Pattern
right: Expression
}
export interface Class extends Node {
id?: Identifier | null
superClass?: Expression | null
body: ClassBody
}
export interface ClassBody extends Node {
type: "ClassBody"
body: Array<MethodDefinition | PropertyDefinition | StaticBlock>
}
export interface MethodDefinition extends Node {
type: "MethodDefinition"
key: Expression | PrivateIdentifier
value: FunctionExpression
kind: "constructor" | "method" | "get" | "set"
computed: boolean
static: boolean
}
export interface ClassDeclaration extends Class {
type: "ClassDeclaration"
id: Identifier
}
export interface ClassExpression extends Class {
type: "ClassExpression"
}
export interface MetaProperty extends Node {
type: "MetaProperty"
meta: Identifier
property: Identifier
}
export interface ImportDeclaration extends Node {
type: "ImportDeclaration"
specifiers: Array<ImportSpecifier | ImportDefaultSpecifier | ImportNamespaceSpecifier>
source: Literal
attributes: Array<ImportAttribute>
}
export interface ImportSpecifier extends Node {
type: "ImportSpecifier"
imported: Identifier | Literal
local: Identifier
}
export interface ImportDefaultSpecifier extends Node {
type: "ImportDefaultSpecifier"
local: Identifier
}
export interface ImportNamespaceSpecifier extends Node {
type: "ImportNamespaceSpecifier"
local: Identifier
}
export interface ImportAttribute extends Node {
type: "ImportAttribute"
key: Identifier | Literal
value: Literal
}
export interface ExportNamedDeclaration extends Node {
type: "ExportNamedDeclaration"
declaration?: Declaration | null
specifiers: Array<ExportSpecifier>
source?: Literal | null
attributes: Array<ImportAttribute>
}
export interface ExportSpecifier extends Node {
type: "ExportSpecifier"
exported: Identifier | Literal
local: Identifier | Literal
}
export interface AnonymousFunctionDeclaration extends Function {
type: "FunctionDeclaration"
id: null
body: BlockStatement
}
export interface AnonymousClassDeclaration extends Class {
type: "ClassDeclaration"
id: null
}
export interface ExportDefaultDeclaration extends Node {
type: "ExportDefaultDeclaration"
declaration: AnonymousFunctionDeclaration | FunctionDeclaration | AnonymousClassDeclaration | ClassDeclaration | Expression
}
export interface ExportAllDeclaration extends Node {
type: "ExportAllDeclaration"
source: Literal
exported?: Identifier | Literal | null
attributes: Array<ImportAttribute>
}
export interface AwaitExpression extends Node {
type: "AwaitExpression"
argument: Expression
}
export interface ChainExpression extends Node {
type: "ChainExpression"
expression: MemberExpression | CallExpression
}
export interface ImportExpression extends Node {
type: "ImportExpression"
source: Expression
options: Expression | null
}
export interface ParenthesizedExpression extends Node {
type: "ParenthesizedExpression"
expression: Expression
}
export interface PropertyDefinition extends Node {
type: "PropertyDefinition"
key: Expression | PrivateIdentifier
value?: Expression | null
computed: boolean
static: boolean
}
export interface PrivateIdentifier extends Node {
type: "PrivateIdentifier"
name: string
}
export interface StaticBlock extends Node {
type: "StaticBlock"
body: Array<Statement>
}
export type Statement =
| ExpressionStatement
| BlockStatement
| EmptyStatement
| DebuggerStatement
| WithStatement
| ReturnStatement
| LabeledStatement
| BreakStatement
| ContinueStatement
| IfStatement
| SwitchStatement
| ThrowStatement
| TryStatement
| WhileStatement
| DoWhileStatement
| ForStatement
| ForInStatement
| ForOfStatement
| Declaration
export type Declaration =
| FunctionDeclaration
| VariableDeclaration
| ClassDeclaration
export type Expression =
| Identifier
| Literal
| ThisExpression
| ArrayExpression
| ObjectExpression
| FunctionExpression
| UnaryExpression
| UpdateExpression
| BinaryExpression
| AssignmentExpression
| LogicalExpression
| MemberExpression
| ConditionalExpression
| CallExpression
| NewExpression
| SequenceExpression
| ArrowFunctionExpression
| YieldExpression
| TemplateLiteral
| TaggedTemplateExpression
| ClassExpression
| MetaProperty
| AwaitExpression
| ChainExpression
| ImportExpression
| ParenthesizedExpression
export type Pattern =
| Identifier
| MemberExpression
| ObjectPattern
| ArrayPattern
| RestElement
| AssignmentPattern
export type ModuleDeclaration =
| ImportDeclaration
| ExportNamedDeclaration
| ExportDefaultDeclaration
| ExportAllDeclaration
export type AnyNode = Statement | Expression | Declaration | ModuleDeclaration | Literal | Program | SwitchCase | CatchClause | Property | Super | SpreadElement | TemplateElement | AssignmentProperty | ObjectPattern | ArrayPattern | RestElement | AssignmentPattern | ClassBody | MethodDefinition | MetaProperty | ImportAttribute | ImportSpecifier | ImportDefaultSpecifier | ImportNamespaceSpecifier | ExportSpecifier | AnonymousFunctionDeclaration | AnonymousClassDeclaration | PropertyDefinition | PrivateIdentifier | StaticBlock | VariableDeclarator
export function parse(input: string, options: Options): Program
export function parseExpressionAt(input: string, pos: number, options: Options): Expression
export function tokenizer(input: string, options: Options): {
getToken(): Token
[Symbol.iterator](): Iterator<Token>
}
export type ecmaVersion = 3 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | "latest"
export interface Options {
/**
* `ecmaVersion` indicates the ECMAScript version to parse. Can be a
* number, either in year (`2022`) or plain version number (`6`) form,
* or `"latest"` (the latest the library supports). This influences
* support for strict mode, the set of reserved words, and support for
* new syntax features.
*/
ecmaVersion: ecmaVersion
/**
* `sourceType` indicates the mode the code should be parsed in.
* Can be either `"script"` or `"module"`. This influences global
* strict mode and parsing of `import` and `export` declarations.
*/
sourceType?: "script" | "module"
/**
* a callback that will be called when a semicolon is automatically inserted.
* @param lastTokEnd the position of the comma as an offset
* @param lastTokEndLoc location if {@link locations} is enabled
*/
onInsertedSemicolon?: (lastTokEnd: number, lastTokEndLoc?: Position) => void
/**
* similar to `onInsertedSemicolon`, but for trailing commas
* @param lastTokEnd the position of the comma as an offset
* @param lastTokEndLoc location if `locations` is enabled
*/
onTrailingComma?: (lastTokEnd: number, lastTokEndLoc?: Position) => void
/**
* By default, reserved words are only enforced if ecmaVersion >= 5.
* Set `allowReserved` to a boolean value to explicitly turn this on
* an off. When this option has the value "never", reserved words
* and keywords can also not be used as property names.
*/
allowReserved?: boolean | "never"
/**
* When enabled, a return at the top level is not considered an error.
*/
allowReturnOutsideFunction?: boolean
/**
* When enabled, import/export statements are not constrained to
* appearing at the top of the program, and an import.meta expression
* in a script isn't considered an error.
*/
allowImportExportEverywhere?: boolean
/**
* By default, `await` identifiers are allowed to appear at the top-level scope only if {@link ecmaVersion} >= 2022.
* When enabled, await identifiers are allowed to appear at the top-level scope,
* but they are still not allowed in non-async functions.
*/
allowAwaitOutsideFunction?: boolean
/**
* When enabled, super identifiers are not constrained to
* appearing in methods and do not raise an error when they appear elsewhere.
*/
allowSuperOutsideMethod?: boolean
/**
* When enabled, hashbang directive in the beginning of file is
* allowed and treated as a line comment. Enabled by default when
* {@link ecmaVersion} >= 2023.
*/
allowHashBang?: boolean
/**
* By default, the parser will verify that private properties are
* only used in places where they are valid and have been declared.
* Set this to false to turn such checks off.
*/
checkPrivateFields?: boolean
/**
* When `locations` is on, `loc` properties holding objects with
* `start` and `end` properties as {@link Position} objects will be attached to the
* nodes.
*/
locations?: boolean
/**
* a callback that will cause Acorn to call that export function with object in the same
* format as tokens returned from `tokenizer().getToken()`. Note
* that you are not allowed to call the parser from the
* callback—that will corrupt its internal state.
*/
onToken?: ((token: Token) => void) | Token[]
/**
* This takes a export function or an array.
*
* When a export function is passed, Acorn will call that export function with `(block, text, start,
* end)` parameters whenever a comment is skipped. `block` is a
* boolean indicating whether this is a block (`/* *\/`) comment,
* `text` is the content of the comment, and `start` and `end` are
* character offsets that denote the start and end of the comment.
* When the {@link locations} option is on, two more parameters are
* passed, the full locations of {@link Position} export type of the start and
* end of the comments.
*
* When a array is passed, each found comment of {@link Comment} export type is pushed to the array.
*
* Note that you are not allowed to call the
* parser from the callback—that will corrupt its internal state.
*/
onComment?: ((
isBlock: boolean, text: string, start: number, end: number, startLoc?: Position,
endLoc?: Position
) => void) | Comment[]
/**
* Nodes have their start and end characters offsets recorded in
* `start` and `end` properties (directly on the node, rather than
* the `loc` object, which holds line/column data. To also add a
* [semi-standardized][range] `range` property holding a `[start,
* end]` array with the same numbers, set the `ranges` option to
* `true`.
*/
ranges?: boolean
/**
* It is possible to parse multiple files into a single AST by
* passing the tree produced by parsing the first file as
* `program` option in subsequent parses. This will add the
* toplevel forms of the parsed file to the `Program` (top) node
* of an existing parse tree.
*/
program?: Node
/**
* When {@link locations} is on, you can pass this to record the source
* file in every node's `loc` object.
*/
sourceFile?: string
/**
* This value, if given, is stored in every node, whether {@link locations} is on or off.
*/
directSourceFile?: string
/**
* When enabled, parenthesized expressions are represented by
* (non-standard) ParenthesizedExpression nodes
*/
preserveParens?: boolean
}
export class Parser {
options: Options
input: string
protected constructor(options: Options, input: string, startPos?: number)
parse(): Program
static parse(input: string, options: Options): Program
static parseExpressionAt(input: string, pos: number, options: Options): Expression
static tokenizer(input: string, options: Options): {
getToken(): Token
[Symbol.iterator](): Iterator<Token>
}
static extend(...plugins: ((BaseParser: typeof Parser) => typeof Parser)[]): typeof Parser
}
export const defaultOptions: Options
export function getLineInfo(input: string, offset: number): Position
export class TokenType {
label: string
keyword: string | undefined
}
export const tokTypes: {
num: TokenType
regexp: TokenType
string: TokenType
name: TokenType
privateId: TokenType
eof: TokenType
bracketL: TokenType
bracketR: TokenType
braceL: TokenType
braceR: TokenType
parenL: TokenType
parenR: TokenType
comma: TokenType
semi: TokenType
colon: TokenType
dot: TokenType
question: TokenType
questionDot: TokenType
arrow: TokenType
template: TokenType
invalidTemplate: TokenType
ellipsis: TokenType
backQuote: TokenType
dollarBraceL: TokenType
eq: TokenType
assign: TokenType
incDec: TokenType
prefix: TokenType
logicalOR: TokenType
logicalAND: TokenType
bitwiseOR: TokenType
bitwiseXOR: TokenType
bitwiseAND: TokenType
equality: TokenType
relational: TokenType
bitShift: TokenType
plusMin: TokenType
modulo: TokenType
star: TokenType
slash: TokenType
starstar: TokenType
coalesce: TokenType
_break: TokenType
_case: TokenType
_catch: TokenType
_continue: TokenType
_debugger: TokenType
_default: TokenType
_do: TokenType
_else: TokenType
_finally: TokenType
_for: TokenType
_function: TokenType
_if: TokenType
_return: TokenType
_switch: TokenType
_throw: TokenType
_try: TokenType
_var: TokenType
_const: TokenType
_while: TokenType
_with: TokenType
_new: TokenType
_this: TokenType
_super: TokenType
_class: TokenType
_extends: TokenType
_export: TokenType
_import: TokenType
_null: TokenType
_true: TokenType
_false: TokenType
_in: TokenType
_instanceof: TokenType
_typeof: TokenType
_void: TokenType
_delete: TokenType
}
export interface Comment {
type: "Line" | "Block"
value: string
start: number
end: number
loc?: SourceLocation
range?: [number, number]
}
export class Token {
type: TokenType
start: number
end: number
loc?: SourceLocation
range?: [number, number]
}
export const version: string