index.js

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function _objectWithoutPropertiesLoose(source, excluded) {
  if (source == null) return {};
  var target = {};
  var sourceKeys = Object.keys(source);
  var key, i;

  for (i = 0; i < sourceKeys.length; i++) {
    key = sourceKeys[i];
    if (excluded.indexOf(key) >= 0) continue;
    target[key] = source[key];
  }

  return target;
}

class Position {
  constructor(line, col, index) {
    this.line = void 0;
    this.column = void 0;
    this.index = void 0;
    this.line = line;
    this.column = col;
    this.index = index;
  }

}
class SourceLocation {
  constructor(start, end) {
    this.start = void 0;
    this.end = void 0;
    this.filename = void 0;
    this.identifierName = void 0;
    this.start = start;
    this.end = end;
  }

}
function createPositionWithColumnOffset(position, columnOffset) {
  const {
    line,
    column,
    index
  } = position;
  return new Position(line, column + columnOffset, index + columnOffset);
}

const ParseErrorCodes = Object.freeze({
  SyntaxError: "BABEL_PARSER_SYNTAX_ERROR",
  SourceTypeModuleError: "BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED"
});

const reflect = (keys, last = keys.length - 1) => ({
  get() {
    return keys.reduce((object, key) => object[key], this);
  },

  set(value) {
    keys.reduce((item, key, i) => i === last ? item[key] = value : item[key], this);
  }

});

const instantiate = (constructor, properties, descriptors) => Object.keys(descriptors).map(key => [key, descriptors[key]]).filter(([, descriptor]) => !!descriptor).map(([key, descriptor]) => [key, typeof descriptor === "function" ? {
  value: descriptor,
  enumerable: false
} : typeof descriptor.reflect === "string" ? Object.assign({}, descriptor, reflect(descriptor.reflect.split("."))) : descriptor]).reduce((instance, [key, descriptor]) => Object.defineProperty(instance, key, Object.assign({
  configurable: true
}, descriptor)), Object.assign(new constructor(), properties));

var ModuleErrors = (_ => ({
  ImportMetaOutsideModule: _(`import.meta may appear only with 'sourceType: "module"'`, {
    code: ParseErrorCodes.SourceTypeModuleError
  }),
  ImportOutsideModule: _(`'import' and 'export' may appear only with 'sourceType: "module"'`, {
    code: ParseErrorCodes.SourceTypeModuleError
  })
}));

const NodeDescriptions = {
  ArrayPattern: "array destructuring pattern",
  AssignmentExpression: "assignment expression",
  AssignmentPattern: "assignment expression",
  ArrowFunctionExpression: "arrow function expression",
  ConditionalExpression: "conditional expression",
  ForOfStatement: "for-of statement",
  ForInStatement: "for-in statement",
  ForStatement: "for-loop",
  FormalParameters: "function parameter list",
  Identifier: "identifier",
  ObjectPattern: "object destructuring pattern",
  ParenthesizedExpression: "parenthesized expression",
  RestElement: "rest element",
  UpdateExpression: {
    true: "prefix operation",
    false: "postfix operation"
  },
  VariableDeclarator: "variable declaration",
  YieldExpression: "yield expression"
};

const toNodeDescription = ({
  type,
  prefix
}) => type === "UpdateExpression" ? NodeDescriptions.UpdateExpression[String(prefix)] : NodeDescriptions[type];

var StandardErrors = (_ => ({
  AccessorIsGenerator: _(({
    kind
  }) => `A ${kind}ter cannot be a generator.`),
  ArgumentsInClass: _("'arguments' is only allowed in functions and class methods."),
  AsyncFunctionInSingleStatementContext: _("Async functions can only be declared at the top level or inside a block."),
  AwaitBindingIdentifier: _("Can not use 'await' as identifier inside an async function."),
  AwaitBindingIdentifierInStaticBlock: _("Can not use 'await' as identifier inside a static block."),
  AwaitExpressionFormalParameter: _("'await' is not allowed in async function parameters."),
  AwaitNotInAsyncContext: _("'await' is only allowed within async functions and at the top levels of modules."),
  AwaitNotInAsyncFunction: _("'await' is only allowed within async functions."),
  BadGetterArity: _("A 'get' accesor must not have any formal parameters."),
  BadSetterArity: _("A 'set' accesor must have exactly one formal parameter."),
  BadSetterRestParameter: _("A 'set' accesor function argument must not be a rest parameter."),
  ConstructorClassField: _("Classes may not have a field named 'constructor'."),
  ConstructorClassPrivateField: _("Classes may not have a private field named '#constructor'."),
  ConstructorIsAccessor: _("Class constructor may not be an accessor."),
  ConstructorIsAsync: _("Constructor can't be an async function."),
  ConstructorIsGenerator: _("Constructor can't be a generator."),
  DeclarationMissingInitializer: _(({
    kind
  }) => `Missing initializer in ${kind} declaration.`),
  DecoratorBeforeExport: _("Decorators must be placed *before* the 'export' keyword. You can set the 'decoratorsBeforeExport' option to false to use the 'export @decorator class {}' syntax."),
  DecoratorConstructor: _("Decorators can't be used with a constructor. Did you mean '@dec class { ... }'?"),
  DecoratorExportClass: _("Using the export keyword between a decorator and a class is not allowed. Please use `export @dec class` instead."),
  DecoratorSemicolon: _("Decorators must not be followed by a semicolon."),
  DecoratorStaticBlock: _("Decorators can't be used with a static block."),
  DeletePrivateField: _("Deleting a private field is not allowed."),
  DestructureNamedImport: _("ES2015 named imports do not destructure. Use another statement for destructuring after the import."),
  DuplicateConstructor: _("Duplicate constructor in the same class."),
  DuplicateDefaultExport: _("Only one default export allowed per module."),
  DuplicateExport: _(({
    exportName
  }) => `\`${exportName}\` has already been exported. Exported identifiers must be unique.`),
  DuplicateProto: _("Redefinition of __proto__ property."),
  DuplicateRegExpFlags: _("Duplicate regular expression flag."),
  ElementAfterRest: _("Rest element must be last element."),
  EscapedCharNotAnIdentifier: _("Invalid Unicode escape."),
  ExportBindingIsString: _(({
    localName,
    exportName
  }) => `A string literal cannot be used as an exported binding without \`from\`.\n- Did you mean \`export { '${localName}' as '${exportName}' } from 'some-module'\`?`),
  ExportDefaultFromAsIdentifier: _("'from' is not allowed as an identifier after 'export default'."),
  ForInOfLoopInitializer: _(({
    type
  }) => `'${type === "ForInStatement" ? "for-in" : "for-of"}' loop variable declaration may not have an initializer.`),
  ForOfAsync: _("The left-hand side of a for-of loop may not be 'async'."),
  ForOfLet: _("The left-hand side of a for-of loop may not start with 'let'."),
  GeneratorInSingleStatementContext: _("Generators can only be declared at the top level or inside a block."),
  IllegalBreakContinue: _(({
    type
  }) => `Unsyntactic ${type === "BreakStatement" ? "break" : "continue"}.`),
  IllegalLanguageModeDirective: _("Illegal 'use strict' directive in function with non-simple parameter list."),
  IllegalReturn: _("'return' outside of function."),
  ImportBindingIsString: _(({
    importName
  }) => `A string literal cannot be used as an imported binding.\n- Did you mean \`import { "${importName}" as foo }\`?`),
  ImportCallArgumentTrailingComma: _("Trailing comma is disallowed inside import(...) arguments."),
  ImportCallArity: _(({
    maxArgumentCount
  }) => `\`import()\` requires exactly ${maxArgumentCount === 1 ? "one argument" : "one or two arguments"}.`),
  ImportCallNotNewExpression: _("Cannot use new with import(...)."),
  ImportCallSpreadArgument: _("`...` is not allowed in `import()`."),
  ImportJSONBindingNotDefault: _("A JSON module can only be imported with `default`."),
  IncompatibleRegExpUVFlags: _("The 'u' and 'v' regular expression flags cannot be enabled at the same time."),
  InvalidBigIntLiteral: _("Invalid BigIntLiteral."),
  InvalidCodePoint: _("Code point out of bounds."),
  InvalidCoverInitializedName: _("Invalid shorthand property initializer."),
  InvalidDecimal: _("Invalid decimal."),
  InvalidDigit: _(({
    radix
  }) => `Expected number in radix ${radix}.`),
  InvalidEscapeSequence: _("Bad character escape sequence."),
  InvalidEscapeSequenceTemplate: _("Invalid escape sequence in template."),
  InvalidEscapedReservedWord: _(({
    reservedWord
  }) => `Escape sequence in keyword ${reservedWord}.`),
  InvalidIdentifier: _(({
    identifierName
  }) => `Invalid identifier ${identifierName}.`),
  InvalidLhs: _(({
    ancestor
  }) => `Invalid left-hand side in ${toNodeDescription(ancestor)}.`),
  InvalidLhsBinding: _(({
    ancestor
  }) => `Binding invalid left-hand side in ${toNodeDescription(ancestor)}.`),
  InvalidNumber: _("Invalid number."),
  InvalidOrMissingExponent: _("Floating-point numbers require a valid exponent after the 'e'."),
  InvalidOrUnexpectedToken: _(({
    unexpected
  }) => `Unexpected character '${unexpected}'.`),
  InvalidParenthesizedAssignment: _("Invalid parenthesized assignment pattern."),
  InvalidPrivateFieldResolution: _(({
    identifierName
  }) => `Private name #${identifierName} is not defined.`),
  InvalidPropertyBindingPattern: _("Binding member expression."),
  InvalidRecordProperty: _("Only properties and spread elements are allowed in record definitions."),
  InvalidRestAssignmentPattern: _("Invalid rest operator's argument."),
  LabelRedeclaration: _(({
    labelName
  }) => `Label '${labelName}' is already declared.`),
  LetInLexicalBinding: _("'let' is not allowed to be used as a name in 'let' or 'const' declarations."),
  LineTerminatorBeforeArrow: _("No line break is allowed before '=>'."),
  MalformedRegExpFlags: _("Invalid regular expression flag."),
  MissingClassName: _("A class name is required."),
  MissingEqInAssignment: _("Only '=' operator can be used for specifying default value."),
  MissingSemicolon: _("Missing semicolon."),
  MissingPlugin: _(({
    missingPlugin
  }) => `This experimental syntax requires enabling the parser plugin: ${missingPlugin.map(name => JSON.stringify(name)).join(", ")}.`),
  MissingOneOfPlugins: _(({
    missingPlugin
  }) => `This experimental syntax requires enabling one of the following parser plugin(s): ${missingPlugin.map(name => JSON.stringify(name)).join(", ")}.`),
  MissingUnicodeEscape: _("Expecting Unicode escape sequence \\uXXXX."),
  MixingCoalesceWithLogical: _("Nullish coalescing operator(??) requires parens when mixing with logical operators."),
  ModuleAttributeDifferentFromType: _("The only accepted module attribute is `type`."),
  ModuleAttributeInvalidValue: _("Only string literals are allowed as module attribute values."),
  ModuleAttributesWithDuplicateKeys: _(({
    key
  }) => `Duplicate key "${key}" is not allowed in module attributes.`),
  ModuleExportNameHasLoneSurrogate: _(({
    surrogateCharCode
  }) => `An export name cannot include a lone surrogate, found '\\u${surrogateCharCode.toString(16)}'.`),
  ModuleExportUndefined: _(({
    localName
  }) => `Export '${localName}' is not defined.`),
  MultipleDefaultsInSwitch: _("Multiple default clauses."),
  NewlineAfterThrow: _("Illegal newline after throw."),
  NoCatchOrFinally: _("Missing catch or finally clause."),
  NumberIdentifier: _("Identifier directly after number."),
  NumericSeparatorInEscapeSequence: _("Numeric separators are not allowed inside unicode escape sequences or hex escape sequences."),
  ObsoleteAwaitStar: _("'await*' has been removed from the async functions proposal. Use Promise.all() instead."),
  OptionalChainingNoNew: _("Constructors in/after an Optional Chain are not allowed."),
  OptionalChainingNoTemplate: _("Tagged Template Literals are not allowed in optionalChain."),
  OverrideOnConstructor: _("'override' modifier cannot appear on a constructor declaration."),
  ParamDupe: _("Argument name clash."),
  PatternHasAccessor: _("Object pattern can't contain getter or setter."),
  PatternHasMethod: _("Object pattern can't contain methods."),
  PrivateInExpectedIn: _(({
    identifierName
  }) => `Private names are only allowed in property accesses (\`obj.#${identifierName}\`) or in \`in\` expressions (\`#${identifierName} in obj\`).`),
  PrivateNameRedeclaration: _(({
    identifierName
  }) => `Duplicate private name #${identifierName}.`),
  RecordExpressionBarIncorrectEndSyntaxType: _("Record expressions ending with '|}' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'."),
  RecordExpressionBarIncorrectStartSyntaxType: _("Record expressions starting with '{|' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'."),
  RecordExpressionHashIncorrectStartSyntaxType: _("Record expressions starting with '#{' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'hash'."),
  RecordNoProto: _("'__proto__' is not allowed in Record expressions."),
  RestTrailingComma: _("Unexpected trailing comma after rest element."),
  SloppyFunction: _("In non-strict mode code, functions can only be declared at top level, inside a block, or as the body of an if statement."),
  StaticPrototype: _("Classes may not have static property named prototype."),
  SuperNotAllowed: _("`super()` is only valid inside a class constructor of a subclass. Maybe a typo in the method name ('constructor') or not extending another class?"),
  SuperPrivateField: _("Private fields can't be accessed on super."),
  TrailingDecorator: _("Decorators must be attached to a class element."),
  TupleExpressionBarIncorrectEndSyntaxType: _("Tuple expressions ending with '|]' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'."),
  TupleExpressionBarIncorrectStartSyntaxType: _("Tuple expressions starting with '[|' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'."),
  TupleExpressionHashIncorrectStartSyntaxType: _("Tuple expressions starting with '#[' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'hash'."),
  UnexpectedArgumentPlaceholder: _("Unexpected argument placeholder."),
  UnexpectedAwaitAfterPipelineBody: _('Unexpected "await" after pipeline body; await must have parentheses in minimal proposal.'),
  UnexpectedDigitAfterHash: _("Unexpected digit after hash token."),
  UnexpectedImportExport: _("'import' and 'export' may only appear at the top level."),
  UnexpectedKeyword: _(({
    keyword
  }) => `Unexpected keyword '${keyword}'.`),
  UnexpectedLeadingDecorator: _("Leading decorators must be attached to a class declaration."),
  UnexpectedLexicalDeclaration: _("Lexical declaration cannot appear in a single-statement context."),
  UnexpectedNewTarget: _("`new.target` can only be used in functions or class properties."),
  UnexpectedNumericSeparator: _("A numeric separator is only allowed between two digits."),
  UnexpectedPrivateField: _("Unexpected private name."),
  UnexpectedReservedWord: _(({
    reservedWord
  }) => `Unexpected reserved word '${reservedWord}'.`),
  UnexpectedSuper: _("'super' is only allowed in object methods and classes."),
  UnexpectedToken: _(({
    expected,
    unexpected
  }) => `Unexpected token${unexpected ? ` '${unexpected}'.` : ""}${expected ? `, expected "${expected}"` : ""}`),
  UnexpectedTokenUnaryExponentiation: _("Illegal expression. Wrap left hand side or entire exponentiation in parentheses."),
  UnsupportedBind: _("Binding should be performed on object property."),
  UnsupportedDecoratorExport: _("A decorated export must export a class declaration."),
  UnsupportedDefaultExport: _("Only expressions, functions or classes are allowed as the `default` export."),
  UnsupportedImport: _("`import` can only be used in `import()` or `import.meta`."),
  UnsupportedMetaProperty: _(({
    target,
    onlyValidPropertyName
  }) => `The only valid meta property for ${target} is ${target}.${onlyValidPropertyName}.`),
  UnsupportedParameterDecorator: _("Decorators cannot be used to decorate parameters."),
  UnsupportedPropertyDecorator: _("Decorators cannot be used to decorate object literal properties."),
  UnsupportedSuper: _("'super' can only be used with function calls (i.e. super()) or in property accesses (i.e. super.prop or super[prop])."),
  UnterminatedComment: _("Unterminated comment."),
  UnterminatedRegExp: _("Unterminated regular expression."),
  UnterminatedString: _("Unterminated string constant."),
  UnterminatedTemplate: _("Unterminated template."),
  VarRedeclaration: _(({
    identifierName
  }) => `Identifier '${identifierName}' has already been declared.`),
  YieldBindingIdentifier: _("Can not use 'yield' as identifier inside a generator."),
  YieldInParameter: _("Yield expression is not allowed in formal parameters."),
  ZeroDigitNumericSeparator: _("Numeric separator can not be used after leading 0.")
}));

var StrictModeErrors = (_ => ({
  StrictDelete: _("Deleting local variable in strict mode."),
  StrictEvalArguments: _(({
    referenceName
  }) => `Assigning to '${referenceName}' in strict mode.`),
  StrictEvalArgumentsBinding: _(({
    bindingName
  }) => `Binding '${bindingName}' in strict mode.`),
  StrictFunction: _("In strict mode code, functions can only be declared at top level or inside a block."),
  StrictNumericEscape: _("The only valid numeric escape in strict mode is '\\0'."),
  StrictOctalLiteral: _("Legacy octal literals are not allowed in strict mode."),
  StrictWith: _("'with' in strict mode.")
}));

const UnparenthesizedPipeBodyDescriptions = new Set(["ArrowFunctionExpression", "AssignmentExpression", "ConditionalExpression", "YieldExpression"]);
var PipelineOperatorErrors = (_ => ({
  PipeBodyIsTighter: _("Unexpected yield after pipeline body; any yield expression acting as Hack-style pipe body must be parenthesized due to its loose operator precedence."),
  PipeTopicRequiresHackPipes: _('Topic reference is used, but the pipelineOperator plugin was not passed a "proposal": "hack" or "smart" option.'),
  PipeTopicUnbound: _("Topic reference is unbound; it must be inside a pipe body."),
  PipeTopicUnconfiguredToken: _(({
    token
  }) => `Invalid topic token ${token}. In order to use ${token} as a topic reference, the pipelineOperator plugin must be configured with { "proposal": "hack", "topicToken": "${token}" }.`),
  PipeTopicUnused: _("Hack-style pipe body does not contain a topic reference; Hack-style pipes must use topic at least once."),
  PipeUnparenthesizedBody: _(({
    type
  }) => `Hack-style pipe body cannot be an unparenthesized ${toNodeDescription({
    type
  })}; please wrap it in parentheses.`),
  PipelineBodyNoArrow: _('Unexpected arrow "=>" after pipeline body; arrow function in pipeline body must be parenthesized.'),
  PipelineBodySequenceExpression: _("Pipeline body may not be a comma-separated sequence expression."),
  PipelineHeadSequenceExpression: _("Pipeline head should not be a comma-separated sequence expression."),
  PipelineTopicUnused: _("Pipeline is in topic style but does not use topic reference."),
  PrimaryTopicNotAllowed: _("Topic reference was used in a lexical context without topic binding."),
  PrimaryTopicRequiresSmartPipeline: _('Topic reference is used, but the pipelineOperator plugin was not passed a "proposal": "hack" or "smart" option.')
}));

const _excluded$1 = ["toMessage"];

function toParseErrorConstructor(_ref) {
  let {
    toMessage
  } = _ref,
      properties = _objectWithoutPropertiesLoose(_ref, _excluded$1);

  return function constructor({
    loc,
    details
  }) {
    return instantiate(SyntaxError, Object.assign({}, properties, {
      loc
    }), {
      clone(overrides = {}) {
        const loc = overrides.loc || {};
        return constructor({
          loc: new Position("line" in loc ? loc.line : this.loc.line, "column" in loc ? loc.column : this.loc.column, "index" in loc ? loc.index : this.loc.index),
          details: Object.assign({}, this.details, overrides.details)
        });
      },

      details: {
        value: details,
        enumerable: false
      },
      message: {
        get() {
          return `${toMessage(this.details)} (${this.loc.line}:${this.loc.column})`;
        },

        set(value) {
          Object.defineProperty(this, "message", {
            value
          });
        }

      },
      pos: {
        reflect: "loc.index",
        enumerable: true
      },
      missingPlugin: "missingPlugin" in details && {
        reflect: "details.missingPlugin",
        enumerable: true
      }
    });
  };
}

function toParseErrorCredentials(toMessageOrMessage, credentials) {
  return Object.assign({
    toMessage: typeof toMessageOrMessage === "string" ? () => toMessageOrMessage : toMessageOrMessage
  }, credentials);
}
function ParseErrorEnum(argument, syntaxPlugin) {
  if (Array.isArray(argument)) {
    return toParseErrorCredentialsMap => ParseErrorEnum(toParseErrorCredentialsMap, argument[0]);
  }

  const partialCredentials = argument(toParseErrorCredentials);
  const ParseErrorConstructors = {};

  for (const reasonCode of Object.keys(partialCredentials)) {
    ParseErrorConstructors[reasonCode] = toParseErrorConstructor(Object.assign({
      code: ParseErrorCodes.SyntaxError,
      reasonCode
    }, syntaxPlugin ? {
      syntaxPlugin
    } : {}, partialCredentials[reasonCode]));
  }

  return ParseErrorConstructors;
}
const Errors = Object.assign({}, ParseErrorEnum(ModuleErrors), ParseErrorEnum(StandardErrors), ParseErrorEnum(StrictModeErrors), ParseErrorEnum`pipelineOperator`(PipelineOperatorErrors));

const {
  defineProperty
} = Object;

const toUnenumerable = (object, key) => defineProperty(object, key, {
  enumerable: false,
  value: object[key]
});

function toESTreeLocation(node) {
  node.loc.start && toUnenumerable(node.loc.start, "index");
  node.loc.end && toUnenumerable(node.loc.end, "index");
  return node;
}

var estree = (superClass => class extends superClass {
  parse() {
    const file = toESTreeLocation(super.parse());

    if (this.options.tokens) {
      file.tokens = file.tokens.map(toESTreeLocation);
    }

    return file;
  }

  parseRegExpLiteral({
    pattern,
    flags
  }) {
    let regex = null;

    try {
      regex = new RegExp(pattern, flags);
    } catch (e) {}

    const node = this.estreeParseLiteral(regex);
    node.regex = {
      pattern,
      flags
    };
    return node;
  }

  parseBigIntLiteral(value) {
    let bigInt;

    try {
      bigInt = BigInt(value);
    } catch (_unused) {
      bigInt = null;
    }

    const node = this.estreeParseLiteral(bigInt);
    node.bigint = String(node.value || value);
    return node;
  }

  parseDecimalLiteral(value) {
    const decimal = null;
    const node = this.estreeParseLiteral(decimal);
    node.decimal = String(node.value || value);
    return node;
  }

  estreeParseLiteral(value) {
    return this.parseLiteral(value, "Literal");
  }

  parseStringLiteral(value) {
    return this.estreeParseLiteral(value);
  }

  parseNumericLiteral(value) {
    return this.estreeParseLiteral(value);
  }

  parseNullLiteral() {
    return this.estreeParseLiteral(null);
  }

  parseBooleanLiteral(value) {
    return this.estreeParseLiteral(value);
  }

  directiveToStmt(directive) {
    const directiveLiteral = directive.value;
    const stmt = this.startNodeAt(directive.start, directive.loc.start);
    const expression = this.startNodeAt(directiveLiteral.start, directiveLiteral.loc.start);
    expression.value = directiveLiteral.extra.expressionValue;
    expression.raw = directiveLiteral.extra.raw;
    stmt.expression = this.finishNodeAt(expression, "Literal", directiveLiteral.loc.end);
    stmt.directive = directiveLiteral.extra.raw.slice(1, -1);
    return this.finishNodeAt(stmt, "ExpressionStatement", directive.loc.end);
  }

  initFunction(node, isAsync) {
    super.initFunction(node, isAsync);
    node.expression = false;
  }

  checkDeclaration(node) {
    if (node != null && this.isObjectProperty(node)) {
      this.checkDeclaration(node.value);
    } else {
      super.checkDeclaration(node);
    }
  }

  getObjectOrClassMethodParams(method) {
    return method.value.params;
  }

  isValidDirective(stmt) {
    var _stmt$expression$extr;

    return stmt.type === "ExpressionStatement" && stmt.expression.type === "Literal" && typeof stmt.expression.value === "string" && !((_stmt$expression$extr = stmt.expression.extra) != null && _stmt$expression$extr.parenthesized);
  }

  parseBlockBody(node, ...args) {
    super.parseBlockBody(node, ...args);
    const directiveStatements = node.directives.map(d => this.directiveToStmt(d));
    node.body = directiveStatements.concat(node.body);
    delete node.directives;
  }

  pushClassMethod(classBody, method, isGenerator, isAsync, isConstructor, allowsDirectSuper) {
    this.parseMethod(method, isGenerator, isAsync, isConstructor, allowsDirectSuper, "ClassMethod", true);

    if (method.typeParameters) {
      method.value.typeParameters = method.typeParameters;
      delete method.typeParameters;
    }

    classBody.body.push(method);
  }

  parsePrivateName() {
    const node = super.parsePrivateName();
    {
      if (!this.getPluginOption("estree", "classFeatures")) {
        return node;
      }
    }
    return this.convertPrivateNameToPrivateIdentifier(node);
  }

  convertPrivateNameToPrivateIdentifier(node) {
    const name = super.getPrivateNameSV(node);
    node = node;
    delete node.id;
    node.name = name;
    node.type = "PrivateIdentifier";
    return node;
  }

  isPrivateName(node) {
    {
      if (!this.getPluginOption("estree", "classFeatures")) {
        return super.isPrivateName(node);
      }
    }
    return node.type === "PrivateIdentifier";
  }

  getPrivateNameSV(node) {
    {
      if (!this.getPluginOption("estree", "classFeatures")) {
        return super.getPrivateNameSV(node);
      }
    }
    return node.name;
  }

  parseLiteral(value, type) {
    const node = super.parseLiteral(value, type);
    node.raw = node.extra.raw;
    delete node.extra;
    return node;
  }

  parseFunctionBody(node, allowExpression, isMethod = false) {
    super.parseFunctionBody(node, allowExpression, isMethod);
    node.expression = node.body.type !== "BlockStatement";
  }

  parseMethod(node, isGenerator, isAsync, isConstructor, allowDirectSuper, type, inClassScope = false) {
    let funcNode = this.startNode();
    funcNode.kind = node.kind;
    funcNode = super.parseMethod(funcNode, isGenerator, isAsync, isConstructor, allowDirectSuper, type, inClassScope);
    funcNode.type = "FunctionExpression";
    delete funcNode.kind;
    node.value = funcNode;

    if (type === "ClassPrivateMethod") {
      node.computed = false;
    }

    type = "MethodDefinition";
    return this.finishNode(node, type);
  }

  parseClassProperty(...args) {
    const propertyNode = super.parseClassProperty(...args);
    {
      if (!this.getPluginOption("estree", "classFeatures")) {
        return propertyNode;
      }
    }
    propertyNode.type = "PropertyDefinition";
    return propertyNode;
  }

  parseClassPrivateProperty(...args) {
    const propertyNode = super.parseClassPrivateProperty(...args);
    {
      if (!this.getPluginOption("estree", "classFeatures")) {
        return propertyNode;
      }
    }
    propertyNode.type = "PropertyDefinition";
    propertyNode.computed = false;
    return propertyNode;
  }

  parseObjectMethod(prop, isGenerator, isAsync, isPattern, isAccessor) {
    const node = super.parseObjectMethod(prop, isGenerator, isAsync, isPattern, isAccessor);

    if (node) {
      node.type = "Property";
      if (node.kind === "method") node.kind = "init";
      node.shorthand = false;
    }

    return node;
  }

  parseObjectProperty(prop, startPos, startLoc, isPattern, refExpressionErrors) {
    const node = super.parseObjectProperty(prop, startPos, startLoc, isPattern, refExpressionErrors);

    if (node) {
      node.kind = "init";
      node.type = "Property";
    }

    return node;
  }

  isValidLVal(type, ...rest) {
    return type === "Property" ? "value" : super.isValidLVal(type, ...rest);
  }

  isAssignable(node, isBinding) {
    if (node != null && this.isObjectProperty(node)) {
      return this.isAssignable(node.value, isBinding);
    }

    return super.isAssignable(node, isBinding);
  }

  toAssignable(node, isLHS = false) {
    if (node != null && this.isObjectProperty(node)) {
      const {
        key,
        value
      } = node;

      if (this.isPrivateName(key)) {
        this.classScope.usePrivateName(this.getPrivateNameSV(key), key.loc.start);
      }

      this.toAssignable(value, isLHS);
    } else {
      super.toAssignable(node, isLHS);
    }
  }

  toAssignableObjectExpressionProp(prop) {
    if (prop.kind === "get" || prop.kind === "set") {
      this.raise(Errors.PatternHasAccessor, {
        at: prop.key
      });
    } else if (prop.method) {
      this.raise(Errors.PatternHasMethod, {
        at: prop.key
      });
    } else {
      super.toAssignableObjectExpressionProp(...arguments);
    }
  }

  finishCallExpression(node, optional) {
    super.finishCallExpression(node, optional);

    if (node.callee.type === "Import") {
      node.type = "ImportExpression";
      node.source = node.arguments[0];

      if (this.hasPlugin("importAssertions")) {
        var _node$arguments$;

        node.attributes = (_node$arguments$ = node.arguments[1]) != null ? _node$arguments$ : null;
      }

      delete node.arguments;
      delete node.callee;
    }

    return node;
  }

  toReferencedArguments(node) {
    if (node.type === "ImportExpression") {
      return;
    }

    super.toReferencedArguments(node);
  }

  parseExport(node) {
    super.parseExport(node);

    switch (node.type) {
      case "ExportAllDeclaration":
        node.exported = null;
        break;

      case "ExportNamedDeclaration":
        if (node.specifiers.length === 1 && node.specifiers[0].type === "ExportNamespaceSpecifier") {
          node.type = "ExportAllDeclaration";
          node.exported = node.specifiers[0].exported;
          delete node.specifiers;
        }

        break;
    }

    return node;
  }

  parseSubscript(base, startPos, startLoc, noCalls, state) {
    const node = super.parseSubscript(base, startPos, startLoc, noCalls, state);

    if (state.optionalChainMember) {
      if (node.type === "OptionalMemberExpression" || node.type === "OptionalCallExpression") {
        node.type = node.type.substring(8);
      }

      if (state.stop) {
        const chain = this.startNodeAtNode(node);
        chain.expression = node;
        return this.finishNode(chain, "ChainExpression");
      }
    } else if (node.type === "MemberExpression" || node.type === "CallExpression") {
      node.optional = false;
    }

    return node;
  }

  hasPropertyAsPrivateName(node) {
    if (node.type === "ChainExpression") {
      node = node.expression;
    }

    return super.hasPropertyAsPrivateName(node);
  }

  isOptionalChain(node) {
    return node.type === "ChainExpression";
  }

  isObjectProperty(node) {
    return node.type === "Property" && node.kind === "init" && !node.method;
  }

  isObjectMethod(node) {
    return node.method || node.kind === "get" || node.kind === "set";
  }

  finishNodeAt(node, type, endLoc) {
    return toESTreeLocation(super.finishNodeAt(node, type, endLoc));
  }

  resetStartLocation(node, start, startLoc) {
    super.resetStartLocation(node, start, startLoc);
    toESTreeLocation(node);
  }

  resetEndLocation(node, endLoc = this.state.lastTokEndLoc) {
    super.resetEndLocation(node, endLoc);
    toESTreeLocation(node);
  }

});

class TokContext {
  constructor(token, preserveSpace) {
    this.token = void 0;
    this.preserveSpace = void 0;
    this.token = token;
    this.preserveSpace = !!preserveSpace;
  }

}
const types = {
  brace: new TokContext("{"),
  j_oTag: new TokContext("<tag"),
  j_cTag: new TokContext("</tag"),
  j_expr: new TokContext("<tag>...</tag>", true)
};
{
  types.template = new TokContext("`", true);
}

const beforeExpr = true;
const startsExpr = true;
const isLoop = true;
const isAssign = true;
const prefix = true;
const postfix = true;
class ExportedTokenType {
  constructor(label, conf = {}) {
    this.label = void 0;
    this.keyword = void 0;
    this.beforeExpr = void 0;
    this.startsExpr = void 0;
    this.rightAssociative = void 0;
    this.isLoop = void 0;
    this.isAssign = void 0;
    this.prefix = void 0;
    this.postfix = void 0;
    this.binop = void 0;
    this.label = label;
    this.keyword = conf.keyword;
    this.beforeExpr = !!conf.beforeExpr;
    this.startsExpr = !!conf.startsExpr;
    this.rightAssociative = !!conf.rightAssociative;
    this.isLoop = !!conf.isLoop;
    this.isAssign = !!conf.isAssign;
    this.prefix = !!conf.prefix;
    this.postfix = !!conf.postfix;
    this.binop = conf.binop != null ? conf.binop : null;
    {
      this.updateContext = null;
    }
  }

}
const keywords$1 = new Map();

function createKeyword(name, options = {}) {
  options.keyword = name;
  const token = createToken(name, options);
  keywords$1.set(name, token);
  return token;
}

function createBinop(name, binop) {
  return createToken(name, {
    beforeExpr,
    binop
  });
}

let tokenTypeCounter = -1;
const tokenTypes = [];
const tokenLabels = [];
const tokenBinops = [];
const tokenBeforeExprs = [];
const tokenStartsExprs = [];
const tokenPrefixes = [];

function createToken(name, options = {}) {
  var _options$binop, _options$beforeExpr, _options$startsExpr, _options$prefix;

  ++tokenTypeCounter;
  tokenLabels.push(name);
  tokenBinops.push((_options$binop = options.binop) != null ? _options$binop : -1);
  tokenBeforeExprs.push((_options$beforeExpr = options.beforeExpr) != null ? _options$beforeExpr : false);
  tokenStartsExprs.push((_options$startsExpr = options.startsExpr) != null ? _options$startsExpr : false);
  tokenPrefixes.push((_options$prefix = options.prefix) != null ? _options$prefix : false);
  tokenTypes.push(new ExportedTokenType(name, options));
  return tokenTypeCounter;
}

function createKeywordLike(name, options = {}) {
  var _options$binop2, _options$beforeExpr2, _options$startsExpr2, _options$prefix2;

  ++tokenTypeCounter;
  keywords$1.set(name, tokenTypeCounter);
  tokenLabels.push(name);
  tokenBinops.push((_options$binop2 = options.binop) != null ? _options$binop2 : -1);
  tokenBeforeExprs.push((_options$beforeExpr2 = options.beforeExpr) != null ? _options$beforeExpr2 : false);
  tokenStartsExprs.push((_options$startsExpr2 = options.startsExpr) != null ? _options$startsExpr2 : false);
  tokenPrefixes.push((_options$prefix2 = options.prefix) != null ? _options$prefix2 : false);
  tokenTypes.push(new ExportedTokenType("name", options));
  return tokenTypeCounter;
}

const tt = {
  bracketL: createToken("[", {
    beforeExpr,
    startsExpr
  }),
  bracketHashL: createToken("#[", {
    beforeExpr,
    startsExpr
  }),
  bracketBarL: createToken("[|", {
    beforeExpr,
    startsExpr
  }),
  bracketR: createToken("]"),
  bracketBarR: createToken("|]"),
  braceL: createToken("{", {
    beforeExpr,
    startsExpr
  }),
  braceBarL: createToken("{|", {
    beforeExpr,
    startsExpr
  }),
  braceHashL: createToken("#{", {
    beforeExpr,
    startsExpr
  }),
  braceR: createToken("}"),
  braceBarR: createToken("|}"),
  parenL: createToken("(", {
    beforeExpr,
    startsExpr
  }),
  parenR: createToken(")"),
  comma: createToken(",", {
    beforeExpr
  }),
  semi: createToken(";", {
    beforeExpr
  }),
  colon: createToken(":", {
    beforeExpr
  }),
  doubleColon: createToken("::", {
    beforeExpr
  }),
  dot: createToken("."),
  question: createToken("?", {
    beforeExpr
  }),
  questionDot: createToken("?."),
  arrow: createToken("=>", {
    beforeExpr
  }),
  template: createToken("template"),
  ellipsis: createToken("...", {
    beforeExpr
  }),
  backQuote: createToken("`", {
    startsExpr
  }),
  dollarBraceL: createToken("${", {
    beforeExpr,
    startsExpr
  }),
  templateTail: createToken("...`", {
    startsExpr
  }),
  templateNonTail: createToken("...${", {
    beforeExpr,
    startsExpr
  }),
  at: createToken("@"),
  hash: createToken("#", {
    startsExpr
  }),
  interpreterDirective: createToken("#!..."),