Docs

6 files changed, 2695 insertions, 0 deletions

diff --git a/node_modules/sucrase/dist/parser/traverser/base.js b/node_modules/sucrase/dist/parser/traverser/base.js
new file mode 100644
index 0000000..85c9c17
--- /dev/null
+++ b/node_modules/sucrase/dist/parser/traverser/base.js
@@ -0,0 +1,60 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true}); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }var _state = require('../tokenizer/state'); var _state2 = _interopRequireDefault(_state);
+var _charcodes = require('../util/charcodes');
+
+ exports.isJSXEnabled;
+ exports.isTypeScriptEnabled;
+ exports.isFlowEnabled;
+ exports.state;
+ exports.input;
+ exports.nextContextId;
+
+ function getNextContextId() {
+  return exports.nextContextId++;
+} exports.getNextContextId = getNextContextId;
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+ function augmentError(error) {
+  if ("pos" in error) {
+    const loc = locationForIndex(error.pos);
+    error.message += ` (${loc.line}:${loc.column})`;
+    error.loc = loc;
+  }
+  return error;
+} exports.augmentError = augmentError;
+
+ class Loc {
+  
+  
+  constructor(line, column) {
+    this.line = line;
+    this.column = column;
+  }
+} exports.Loc = Loc;
+
+ function locationForIndex(pos) {
+  let line = 1;
+  let column = 1;
+  for (let i = 0; i < pos; i++) {
+    if (exports.input.charCodeAt(i) === _charcodes.charCodes.lineFeed) {
+      line++;
+      column = 1;
+    } else {
+      column++;
+    }
+  }
+  return new Loc(line, column);
+} exports.locationForIndex = locationForIndex;
+
+ function initParser(
+  inputCode,
+  isJSXEnabledArg,
+  isTypeScriptEnabledArg,
+  isFlowEnabledArg,
+) {
+  exports.input = inputCode;
+  exports.state = new (0, _state2.default)();
+  exports.nextContextId = 1;
+  exports.isJSXEnabled = isJSXEnabledArg;
+  exports.isTypeScriptEnabled = isTypeScriptEnabledArg;
+  exports.isFlowEnabled = isFlowEnabledArg;
+} exports.initParser = initParser;
diff --git a/node_modules/sucrase/dist/parser/traverser/expression.js b/node_modules/sucrase/dist/parser/traverser/expression.js
new file mode 100644
index 0000000..d0011e3
--- /dev/null
+++ b/node_modules/sucrase/dist/parser/traverser/expression.js
@@ -0,0 +1,1022 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true});/* eslint max-len: 0 */
+
+// A recursive descent parser operates by defining functions for all
+// syntactic elements, and recursively calling those, each function
+// advancing the input stream and returning an AST node. Precedence
+// of constructs (for example, the fact that `!x[1]` means `!(x[1])`
+// instead of `(!x)[1]` is handled by the fact that the parser
+// function that parses unary prefix operators is called first, and
+// in turn calls the function that parses `[]` subscripts — that
+// way, it'll receive the node for `x[1]` already parsed, and wraps
+// *that* in the unary operator node.
+//
+// Acorn uses an [operator precedence parser][opp] to handle binary
+// operator precedence, because it is much more compact than using
+// the technique outlined above, which uses different, nesting
+// functions to specify precedence, for all of the ten binary
+// precedence levels that JavaScript defines.
+//
+// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser
+
+
+
+
+
+
+
+
+
+
+
+var _flow = require('../plugins/flow');
+var _index = require('../plugins/jsx/index');
+var _types = require('../plugins/types');
+
+
+
+
+
+
+
+
+
+var _typescript = require('../plugins/typescript');
+
+
+
+
+
+
+
+
+
+
+
+
+var _index3 = require('../tokenizer/index');
+var _keywords = require('../tokenizer/keywords');
+var _state = require('../tokenizer/state');
+var _types3 = require('../tokenizer/types');
+var _charcodes = require('../util/charcodes');
+var _identifier = require('../util/identifier');
+var _base = require('./base');
+
+
+
+
+
+
+var _lval = require('./lval');
+
+
+
+
+
+
+
+var _statement = require('./statement');
+
+
+
+
+
+
+
+
+
+var _util = require('./util');
+
+ class StopState {
+  
+  constructor(stop) {
+    this.stop = stop;
+  }
+} exports.StopState = StopState;
+
+// ### Expression parsing
+
+// These nest, from the most general expression type at the top to
+// 'atomic', nondivisible expression types at the bottom. Most of
+// the functions will simply let the function (s) below them parse,
+// and, *if* the syntactic construct they handle is present, wrap
+// the AST node that the inner parser gave them in another node.
+ function parseExpression(noIn = false) {
+  parseMaybeAssign(noIn);
+  if (_index3.match.call(void 0, _types3.TokenType.comma)) {
+    while (_index3.eat.call(void 0, _types3.TokenType.comma)) {
+      parseMaybeAssign(noIn);
+    }
+  }
+} exports.parseExpression = parseExpression;
+
+/**
+ * noIn is used when parsing a for loop so that we don't interpret a following "in" as the binary
+ * operatior.
+ * isWithinParens is used to indicate that we're parsing something that might be a comma expression
+ * or might be an arrow function or might be a Flow type assertion (which requires explicit parens).
+ * In these cases, we should allow : and ?: after the initial "left" part.
+ */
+ function parseMaybeAssign(noIn = false, isWithinParens = false) {
+  if (_base.isTypeScriptEnabled) {
+    return _typescript.tsParseMaybeAssign.call(void 0, noIn, isWithinParens);
+  } else if (_base.isFlowEnabled) {
+    return _flow.flowParseMaybeAssign.call(void 0, noIn, isWithinParens);
+  } else {
+    return baseParseMaybeAssign(noIn, isWithinParens);
+  }
+} exports.parseMaybeAssign = parseMaybeAssign;
+
+// Parse an assignment expression. This includes applications of
+// operators like `+=`.
+// Returns true if the expression was an arrow function.
+ function baseParseMaybeAssign(noIn, isWithinParens) {
+  if (_index3.match.call(void 0, _types3.TokenType._yield)) {
+    parseYield();
+    return false;
+  }
+
+  if (_index3.match.call(void 0, _types3.TokenType.parenL) || _index3.match.call(void 0, _types3.TokenType.name) || _index3.match.call(void 0, _types3.TokenType._yield)) {
+    _base.state.potentialArrowAt = _base.state.start;
+  }
+
+  const wasArrow = parseMaybeConditional(noIn);
+  if (isWithinParens) {
+    parseParenItem();
+  }
+  if (_base.state.type & _types3.TokenType.IS_ASSIGN) {
+    _index3.next.call(void 0, );
+    parseMaybeAssign(noIn);
+    return false;
+  }
+  return wasArrow;
+} exports.baseParseMaybeAssign = baseParseMaybeAssign;
+
+// Parse a ternary conditional (`?:`) operator.
+// Returns true if the expression was an arrow function.
+function parseMaybeConditional(noIn) {
+  const wasArrow = parseExprOps(noIn);
+  if (wasArrow) {
+    return true;
+  }
+  parseConditional(noIn);
+  return false;
+}
+
+function parseConditional(noIn) {
+  if (_base.isTypeScriptEnabled || _base.isFlowEnabled) {
+    _types.typedParseConditional.call(void 0, noIn);
+  } else {
+    baseParseConditional(noIn);
+  }
+}
+
+ function baseParseConditional(noIn) {
+  if (_index3.eat.call(void 0, _types3.TokenType.question)) {
+    parseMaybeAssign();
+    _util.expect.call(void 0, _types3.TokenType.colon);
+    parseMaybeAssign(noIn);
+  }
+} exports.baseParseConditional = baseParseConditional;
+
+// Start the precedence parser.
+// Returns true if this was an arrow function
+function parseExprOps(noIn) {
+  const startTokenIndex = _base.state.tokens.length;
+  const wasArrow = parseMaybeUnary();
+  if (wasArrow) {
+    return true;
+  }
+  parseExprOp(startTokenIndex, -1, noIn);
+  return false;
+}
+
+// Parse binary operators with the operator precedence parsing
+// algorithm. `left` is the left-hand side of the operator.
+// `minPrec` provides context that allows the function to stop and
+// defer further parser to one of its callers when it encounters an
+// operator that has a lower precedence than the set it is parsing.
+function parseExprOp(startTokenIndex, minPrec, noIn) {
+  if (
+    _base.isTypeScriptEnabled &&
+    (_types3.TokenType._in & _types3.TokenType.PRECEDENCE_MASK) > minPrec &&
+    !_util.hasPrecedingLineBreak.call(void 0, ) &&
+    (_util.eatContextual.call(void 0, _keywords.ContextualKeyword._as) || _util.eatContextual.call(void 0, _keywords.ContextualKeyword._satisfies))
+  ) {
+    const oldIsType = _index3.pushTypeContext.call(void 0, 1);
+    _typescript.tsParseType.call(void 0, );
+    _index3.popTypeContext.call(void 0, oldIsType);
+    _index3.rescan_gt.call(void 0, );
+    parseExprOp(startTokenIndex, minPrec, noIn);
+    return;
+  }
+
+  const prec = _base.state.type & _types3.TokenType.PRECEDENCE_MASK;
+  if (prec > 0 && (!noIn || !_index3.match.call(void 0, _types3.TokenType._in))) {
+    if (prec > minPrec) {
+      const op = _base.state.type;
+      _index3.next.call(void 0, );
+      if (op === _types3.TokenType.nullishCoalescing) {
+        _base.state.tokens[_base.state.tokens.length - 1].nullishStartIndex = startTokenIndex;
+      }
+
+      const rhsStartTokenIndex = _base.state.tokens.length;
+      parseMaybeUnary();
+      // Extend the right operand of this operator if possible.
+      parseExprOp(rhsStartTokenIndex, op & _types3.TokenType.IS_RIGHT_ASSOCIATIVE ? prec - 1 : prec, noIn);
+      if (op === _types3.TokenType.nullishCoalescing) {
+        _base.state.tokens[startTokenIndex].numNullishCoalesceStarts++;
+        _base.state.tokens[_base.state.tokens.length - 1].numNullishCoalesceEnds++;
+      }
+      // Continue with any future operator holding this expression as the left operand.
+      parseExprOp(startTokenIndex, minPrec, noIn);
+    }
+  }
+}
+
+// Parse unary operators, both prefix and postfix.
+// Returns true if this was an arrow function.
+ function parseMaybeUnary() {
+  if (_base.isTypeScriptEnabled && !_base.isJSXEnabled && _index3.eat.call(void 0, _types3.TokenType.lessThan)) {
+    _typescript.tsParseTypeAssertion.call(void 0, );
+    return false;
+  }
+  if (
+    _util.isContextual.call(void 0, _keywords.ContextualKeyword._module) &&
+    _index3.lookaheadCharCode.call(void 0, ) === _charcodes.charCodes.leftCurlyBrace &&
+    !_util.hasFollowingLineBreak.call(void 0, )
+  ) {
+    parseModuleExpression();
+    return false;
+  }
+  if (_base.state.type & _types3.TokenType.IS_PREFIX) {
+    _index3.next.call(void 0, );
+    parseMaybeUnary();
+    return false;
+  }
+
+  const wasArrow = parseExprSubscripts();
+  if (wasArrow) {
+    return true;
+  }
+  while (_base.state.type & _types3.TokenType.IS_POSTFIX && !_util.canInsertSemicolon.call(void 0, )) {
+    // The tokenizer calls everything a preincrement, so make it a postincrement when
+    // we see it in that context.
+    if (_base.state.type === _types3.TokenType.preIncDec) {
+      _base.state.type = _types3.TokenType.postIncDec;
+    }
+    _index3.next.call(void 0, );
+  }
+  return false;
+} exports.parseMaybeUnary = parseMaybeUnary;
+
+// Parse call, dot, and `[]`-subscript expressions.
+// Returns true if this was an arrow function.
+ function parseExprSubscripts() {
+  const startTokenIndex = _base.state.tokens.length;
+  const wasArrow = parseExprAtom();
+  if (wasArrow) {
+    return true;
+  }
+  parseSubscripts(startTokenIndex);
+  // If there was any optional chain operation, the start token would be marked
+  // as such, so also mark the end now.
+  if (_base.state.tokens.length > startTokenIndex && _base.state.tokens[startTokenIndex].isOptionalChainStart) {
+    _base.state.tokens[_base.state.tokens.length - 1].isOptionalChainEnd = true;
+  }
+  return false;
+} exports.parseExprSubscripts = parseExprSubscripts;
+
+function parseSubscripts(startTokenIndex, noCalls = false) {
+  if (_base.isFlowEnabled) {
+    _flow.flowParseSubscripts.call(void 0, startTokenIndex, noCalls);
+  } else {
+    baseParseSubscripts(startTokenIndex, noCalls);
+  }
+}
+
+ function baseParseSubscripts(startTokenIndex, noCalls = false) {
+  const stopState = new StopState(false);
+  do {
+    parseSubscript(startTokenIndex, noCalls, stopState);
+  } while (!stopState.stop && !_base.state.error);
+} exports.baseParseSubscripts = baseParseSubscripts;
+
+function parseSubscript(startTokenIndex, noCalls, stopState) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseSubscript.call(void 0, startTokenIndex, noCalls, stopState);
+  } else if (_base.isFlowEnabled) {
+    _flow.flowParseSubscript.call(void 0, startTokenIndex, noCalls, stopState);
+  } else {
+    baseParseSubscript(startTokenIndex, noCalls, stopState);
+  }
+}
+
+/** Set 'state.stop = true' to indicate that we should stop parsing subscripts. */
+ function baseParseSubscript(
+  startTokenIndex,
+  noCalls,
+  stopState,
+) {
+  if (!noCalls && _index3.eat.call(void 0, _types3.TokenType.doubleColon)) {
+    parseNoCallExpr();
+    stopState.stop = true;
+    // Propagate startTokenIndex so that `a::b?.()` will keep `a` as the first token. We may want
+    // to revisit this in the future when fully supporting bind syntax.
+    parseSubscripts(startTokenIndex, noCalls);
+  } else if (_index3.match.call(void 0, _types3.TokenType.questionDot)) {
+    _base.state.tokens[startTokenIndex].isOptionalChainStart = true;
+    if (noCalls && _index3.lookaheadType.call(void 0, ) === _types3.TokenType.parenL) {
+      stopState.stop = true;
+      return;
+    }
+    _index3.next.call(void 0, );
+    _base.state.tokens[_base.state.tokens.length - 1].subscriptStartIndex = startTokenIndex;
+
+    if (_index3.eat.call(void 0, _types3.TokenType.bracketL)) {
+      parseExpression();
+      _util.expect.call(void 0, _types3.TokenType.bracketR);
+    } else if (_index3.eat.call(void 0, _types3.TokenType.parenL)) {
+      parseCallExpressionArguments();
+    } else {
+      parseMaybePrivateName();
+    }
+  } else if (_index3.eat.call(void 0, _types3.TokenType.dot)) {
+    _base.state.tokens[_base.state.tokens.length - 1].subscriptStartIndex = startTokenIndex;
+    parseMaybePrivateName();
+  } else if (_index3.eat.call(void 0, _types3.TokenType.bracketL)) {
+    _base.state.tokens[_base.state.tokens.length - 1].subscriptStartIndex = startTokenIndex;
+    parseExpression();
+    _util.expect.call(void 0, _types3.TokenType.bracketR);
+  } else if (!noCalls && _index3.match.call(void 0, _types3.TokenType.parenL)) {
+    if (atPossibleAsync()) {
+      // We see "async", but it's possible it's a usage of the name "async". Parse as if it's a
+      // function call, and if we see an arrow later, backtrack and re-parse as a parameter list.
+      const snapshot = _base.state.snapshot();
+      const asyncStartTokenIndex = _base.state.tokens.length;
+      _index3.next.call(void 0, );
+      _base.state.tokens[_base.state.tokens.length - 1].subscriptStartIndex = startTokenIndex;
+
+      const callContextId = _base.getNextContextId.call(void 0, );
+
+      _base.state.tokens[_base.state.tokens.length - 1].contextId = callContextId;
+      parseCallExpressionArguments();
+      _base.state.tokens[_base.state.tokens.length - 1].contextId = callContextId;
+
+      if (shouldParseAsyncArrow()) {
+        // We hit an arrow, so backtrack and start again parsing function parameters.
+        _base.state.restoreFromSnapshot(snapshot);
+        stopState.stop = true;
+        _base.state.scopeDepth++;
+
+        _statement.parseFunctionParams.call(void 0, );
+        parseAsyncArrowFromCallExpression(asyncStartTokenIndex);
+      }
+    } else {
+      _index3.next.call(void 0, );
+      _base.state.tokens[_base.state.tokens.length - 1].subscriptStartIndex = startTokenIndex;
+      const callContextId = _base.getNextContextId.call(void 0, );
+      _base.state.tokens[_base.state.tokens.length - 1].contextId = callContextId;
+      parseCallExpressionArguments();
+      _base.state.tokens[_base.state.tokens.length - 1].contextId = callContextId;
+    }
+  } else if (_index3.match.call(void 0, _types3.TokenType.backQuote)) {
+    // Tagged template expression.
+    parseTemplate();
+  } else {
+    stopState.stop = true;
+  }
+} exports.baseParseSubscript = baseParseSubscript;
+
+ function atPossibleAsync() {
+  // This was made less strict than the original version to avoid passing around nodes, but it
+  // should be safe to have rare false positives here.
+  return (
+    _base.state.tokens[_base.state.tokens.length - 1].contextualKeyword === _keywords.ContextualKeyword._async &&
+    !_util.canInsertSemicolon.call(void 0, )
+  );
+} exports.atPossibleAsync = atPossibleAsync;
+
+ function parseCallExpressionArguments() {
+  let first = true;
+  while (!_index3.eat.call(void 0, _types3.TokenType.parenR) && !_base.state.error) {
+    if (first) {
+      first = false;
+    } else {
+      _util.expect.call(void 0, _types3.TokenType.comma);
+      if (_index3.eat.call(void 0, _types3.TokenType.parenR)) {
+        break;
+      }
+    }
+
+    parseExprListItem(false);
+  }
+} exports.parseCallExpressionArguments = parseCallExpressionArguments;
+
+function shouldParseAsyncArrow() {
+  return _index3.match.call(void 0, _types3.TokenType.colon) || _index3.match.call(void 0, _types3.TokenType.arrow);
+}
+
+function parseAsyncArrowFromCallExpression(startTokenIndex) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsStartParseAsyncArrowFromCallExpression.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    _flow.flowStartParseAsyncArrowFromCallExpression.call(void 0, );
+  }
+  _util.expect.call(void 0, _types3.TokenType.arrow);
+  parseArrowExpression(startTokenIndex);
+}
+
+// Parse a no-call expression (like argument of `new` or `::` operators).
+
+function parseNoCallExpr() {
+  const startTokenIndex = _base.state.tokens.length;
+  parseExprAtom();
+  parseSubscripts(startTokenIndex, true);
+}
+
+// Parse an atomic expression — either a single token that is an
+// expression, an expression started by a keyword like `function` or
+// `new`, or an expression wrapped in punctuation like `()`, `[]`,
+// or `{}`.
+// Returns true if the parsed expression was an arrow function.
+ function parseExprAtom() {
+  if (_index3.eat.call(void 0, _types3.TokenType.modulo)) {
+    // V8 intrinsic expression. Just parse the identifier, and the function invocation is parsed
+    // naturally.
+    parseIdentifier();
+    return false;
+  }
+
+  if (_index3.match.call(void 0, _types3.TokenType.jsxText) || _index3.match.call(void 0, _types3.TokenType.jsxEmptyText)) {
+    parseLiteral();
+    return false;
+  } else if (_index3.match.call(void 0, _types3.TokenType.lessThan) && _base.isJSXEnabled) {
+    _base.state.type = _types3.TokenType.jsxTagStart;
+    _index.jsxParseElement.call(void 0, );
+    _index3.next.call(void 0, );
+    return false;
+  }
+
+  const canBeArrow = _base.state.potentialArrowAt === _base.state.start;
+  switch (_base.state.type) {
+    case _types3.TokenType.slash:
+    case _types3.TokenType.assign:
+      _index3.retokenizeSlashAsRegex.call(void 0, );
+    // Fall through.
+
+    case _types3.TokenType._super:
+    case _types3.TokenType._this:
+    case _types3.TokenType.regexp:
+    case _types3.TokenType.num:
+    case _types3.TokenType.bigint:
+    case _types3.TokenType.decimal:
+    case _types3.TokenType.string:
+    case _types3.TokenType._null:
+    case _types3.TokenType._true:
+    case _types3.TokenType._false:
+      _index3.next.call(void 0, );
+      return false;
+
+    case _types3.TokenType._import:
+      _index3.next.call(void 0, );
+      if (_index3.match.call(void 0, _types3.TokenType.dot)) {
+        // import.meta
+        _base.state.tokens[_base.state.tokens.length - 1].type = _types3.TokenType.name;
+        _index3.next.call(void 0, );
+        parseIdentifier();
+      }
+      return false;
+
+    case _types3.TokenType.name: {
+      const startTokenIndex = _base.state.tokens.length;
+      const functionStart = _base.state.start;
+      const contextualKeyword = _base.state.contextualKeyword;
+      parseIdentifier();
+      if (contextualKeyword === _keywords.ContextualKeyword._await) {
+        parseAwait();
+        return false;
+      } else if (
+        contextualKeyword === _keywords.ContextualKeyword._async &&
+        _index3.match.call(void 0, _types3.TokenType._function) &&
+        !_util.canInsertSemicolon.call(void 0, )
+      ) {
+        _index3.next.call(void 0, );
+        _statement.parseFunction.call(void 0, functionStart, false);
+        return false;
+      } else if (
+        canBeArrow &&
+        contextualKeyword === _keywords.ContextualKeyword._async &&
+        !_util.canInsertSemicolon.call(void 0, ) &&
+        _index3.match.call(void 0, _types3.TokenType.name)
+      ) {
+        _base.state.scopeDepth++;
+        _lval.parseBindingIdentifier.call(void 0, false);
+        _util.expect.call(void 0, _types3.TokenType.arrow);
+        // let foo = async bar => {};
+        parseArrowExpression(startTokenIndex);
+        return true;
+      } else if (_index3.match.call(void 0, _types3.TokenType._do) && !_util.canInsertSemicolon.call(void 0, )) {
+        _index3.next.call(void 0, );
+        _statement.parseBlock.call(void 0, );
+        return false;
+      }
+
+      if (canBeArrow && !_util.canInsertSemicolon.call(void 0, ) && _index3.match.call(void 0, _types3.TokenType.arrow)) {
+        _base.state.scopeDepth++;
+        _lval.markPriorBindingIdentifier.call(void 0, false);
+        _util.expect.call(void 0, _types3.TokenType.arrow);
+        parseArrowExpression(startTokenIndex);
+        return true;
+      }
+
+      _base.state.tokens[_base.state.tokens.length - 1].identifierRole = _index3.IdentifierRole.Access;
+      return false;
+    }
+
+    case _types3.TokenType._do: {
+      _index3.next.call(void 0, );
+      _statement.parseBlock.call(void 0, );
+      return false;
+    }
+
+    case _types3.TokenType.parenL: {
+      const wasArrow = parseParenAndDistinguishExpression(canBeArrow);
+      return wasArrow;
+    }
+
+    case _types3.TokenType.bracketL:
+      _index3.next.call(void 0, );
+      parseExprList(_types3.TokenType.bracketR, true);
+      return false;
+
+    case _types3.TokenType.braceL:
+      parseObj(false, false);
+      return false;
+
+    case _types3.TokenType._function:
+      parseFunctionExpression();
+      return false;
+
+    case _types3.TokenType.at:
+      _statement.parseDecorators.call(void 0, );
+    // Fall through.
+
+    case _types3.TokenType._class:
+      _statement.parseClass.call(void 0, false);
+      return false;
+
+    case _types3.TokenType._new:
+      parseNew();
+      return false;
+
+    case _types3.TokenType.backQuote:
+      parseTemplate();
+      return false;
+
+    case _types3.TokenType.doubleColon: {
+      _index3.next.call(void 0, );
+      parseNoCallExpr();
+      return false;
+    }
+
+    case _types3.TokenType.hash: {
+      const code = _index3.lookaheadCharCode.call(void 0, );
+      if (_identifier.IS_IDENTIFIER_START[code] || code === _charcodes.charCodes.backslash) {
+        parseMaybePrivateName();
+      } else {
+        _index3.next.call(void 0, );
+      }
+      // Smart pipeline topic reference.
+      return false;
+    }
+
+    default:
+      _util.unexpected.call(void 0, );
+      return false;
+  }
+} exports.parseExprAtom = parseExprAtom;
+
+function parseMaybePrivateName() {
+  _index3.eat.call(void 0, _types3.TokenType.hash);
+  parseIdentifier();
+}
+
+function parseFunctionExpression() {
+  const functionStart = _base.state.start;
+  parseIdentifier();
+  if (_index3.eat.call(void 0, _types3.TokenType.dot)) {
+    // function.sent
+    parseIdentifier();
+  }
+  _statement.parseFunction.call(void 0, functionStart, false);
+}
+
+ function parseLiteral() {
+  _index3.next.call(void 0, );
+} exports.parseLiteral = parseLiteral;
+
+ function parseParenExpression() {
+  _util.expect.call(void 0, _types3.TokenType.parenL);
+  parseExpression();
+  _util.expect.call(void 0, _types3.TokenType.parenR);
+} exports.parseParenExpression = parseParenExpression;
+
+// Returns true if this was an arrow expression.
+function parseParenAndDistinguishExpression(canBeArrow) {
+  // Assume this is a normal parenthesized expression, but if we see an arrow, we'll bail and
+  // start over as a parameter list.
+  const snapshot = _base.state.snapshot();
+
+  const startTokenIndex = _base.state.tokens.length;
+  _util.expect.call(void 0, _types3.TokenType.parenL);
+
+  let first = true;
+
+  while (!_index3.match.call(void 0, _types3.TokenType.parenR) && !_base.state.error) {
+    if (first) {
+      first = false;
+    } else {
+      _util.expect.call(void 0, _types3.TokenType.comma);
+      if (_index3.match.call(void 0, _types3.TokenType.parenR)) {
+        break;
+      }
+    }
+
+    if (_index3.match.call(void 0, _types3.TokenType.ellipsis)) {
+      _lval.parseRest.call(void 0, false /* isBlockScope */);
+      parseParenItem();
+      break;
+    } else {
+      parseMaybeAssign(false, true);
+    }
+  }
+
+  _util.expect.call(void 0, _types3.TokenType.parenR);
+
+  if (canBeArrow && shouldParseArrow()) {
+    const wasArrow = parseArrow();
+    if (wasArrow) {
+      // It was an arrow function this whole time, so start over and parse it as params so that we
+      // get proper token annotations.
+      _base.state.restoreFromSnapshot(snapshot);
+      _base.state.scopeDepth++;
+      // Don't specify a context ID because arrow functions don't need a context ID.
+      _statement.parseFunctionParams.call(void 0, );
+      parseArrow();
+      parseArrowExpression(startTokenIndex);
+      if (_base.state.error) {
+        // Nevermind! This must have been something that looks very much like an
+        // arrow function but where its "parameter list" isn't actually a valid
+        // parameter list. Force non-arrow parsing.
+        // See https://github.com/alangpierce/sucrase/issues/666 for an example.
+        _base.state.restoreFromSnapshot(snapshot);
+        parseParenAndDistinguishExpression(false);
+        return false;
+      }
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function shouldParseArrow() {
+  return _index3.match.call(void 0, _types3.TokenType.colon) || !_util.canInsertSemicolon.call(void 0, );
+}
+
+// Returns whether there was an arrow token.
+ function parseArrow() {
+  if (_base.isTypeScriptEnabled) {
+    return _typescript.tsParseArrow.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    return _flow.flowParseArrow.call(void 0, );
+  } else {
+    return _index3.eat.call(void 0, _types3.TokenType.arrow);
+  }
+} exports.parseArrow = parseArrow;
+
+function parseParenItem() {
+  if (_base.isTypeScriptEnabled || _base.isFlowEnabled) {
+    _types.typedParseParenItem.call(void 0, );
+  }
+}
+
+// New's precedence is slightly tricky. It must allow its argument to
+// be a `[]` or dot subscript expression, but not a call — at least,
+// not without wrapping it in parentheses. Thus, it uses the noCalls
+// argument to parseSubscripts to prevent it from consuming the
+// argument list.
+function parseNew() {
+  _util.expect.call(void 0, _types3.TokenType._new);
+  if (_index3.eat.call(void 0, _types3.TokenType.dot)) {
+    // new.target
+    parseIdentifier();
+    return;
+  }
+  parseNewCallee();
+  if (_base.isFlowEnabled) {
+    _flow.flowStartParseNewArguments.call(void 0, );
+  }
+  if (_index3.eat.call(void 0, _types3.TokenType.parenL)) {
+    parseExprList(_types3.TokenType.parenR);
+  }
+}
+
+function parseNewCallee() {
+  parseNoCallExpr();
+  _index3.eat.call(void 0, _types3.TokenType.questionDot);
+}
+
+ function parseTemplate() {
+  // Finish `, read quasi
+  _index3.nextTemplateToken.call(void 0, );
+  // Finish quasi, read ${
+  _index3.nextTemplateToken.call(void 0, );
+  while (!_index3.match.call(void 0, _types3.TokenType.backQuote) && !_base.state.error) {
+    _util.expect.call(void 0, _types3.TokenType.dollarBraceL);
+    parseExpression();
+    // Finish }, read quasi
+    _index3.nextTemplateToken.call(void 0, );
+    // Finish quasi, read either ${ or `
+    _index3.nextTemplateToken.call(void 0, );
+  }
+  _index3.next.call(void 0, );
+} exports.parseTemplate = parseTemplate;
+
+// Parse an object literal or binding pattern.
+ function parseObj(isPattern, isBlockScope) {
+  // Attach a context ID to the object open and close brace and each object key.
+  const contextId = _base.getNextContextId.call(void 0, );
+  let first = true;
+
+  _index3.next.call(void 0, );
+  _base.state.tokens[_base.state.tokens.length - 1].contextId = contextId;
+
+  while (!_index3.eat.call(void 0, _types3.TokenType.braceR) && !_base.state.error) {
+    if (first) {
+      first = false;
+    } else {
+      _util.expect.call(void 0, _types3.TokenType.comma);
+      if (_index3.eat.call(void 0, _types3.TokenType.braceR)) {
+        break;
+      }
+    }
+
+    let isGenerator = false;
+    if (_index3.match.call(void 0, _types3.TokenType.ellipsis)) {
+      const previousIndex = _base.state.tokens.length;
+      _lval.parseSpread.call(void 0, );
+      if (isPattern) {
+        // Mark role when the only thing being spread over is an identifier.
+        if (_base.state.tokens.length === previousIndex + 2) {
+          _lval.markPriorBindingIdentifier.call(void 0, isBlockScope);
+        }
+        if (_index3.eat.call(void 0, _types3.TokenType.braceR)) {
+          break;
+        }
+      }
+      continue;
+    }
+
+    if (!isPattern) {
+      isGenerator = _index3.eat.call(void 0, _types3.TokenType.star);
+    }
+
+    if (!isPattern && _util.isContextual.call(void 0, _keywords.ContextualKeyword._async)) {
+      if (isGenerator) _util.unexpected.call(void 0, );
+
+      parseIdentifier();
+      if (
+        _index3.match.call(void 0, _types3.TokenType.colon) ||
+        _index3.match.call(void 0, _types3.TokenType.parenL) ||
+        _index3.match.call(void 0, _types3.TokenType.braceR) ||
+        _index3.match.call(void 0, _types3.TokenType.eq) ||
+        _index3.match.call(void 0, _types3.TokenType.comma)
+      ) {
+        // This is a key called "async" rather than an async function.
+      } else {
+        if (_index3.match.call(void 0, _types3.TokenType.star)) {
+          _index3.next.call(void 0, );
+          isGenerator = true;
+        }
+        parsePropertyName(contextId);
+      }
+    } else {
+      parsePropertyName(contextId);
+    }
+
+    parseObjPropValue(isPattern, isBlockScope, contextId);
+  }
+
+  _base.state.tokens[_base.state.tokens.length - 1].contextId = contextId;
+} exports.parseObj = parseObj;
+
+function isGetterOrSetterMethod(isPattern) {
+  // We go off of the next and don't bother checking if the node key is actually "get" or "set".
+  // This lets us avoid generating a node, and should only make the validation worse.
+  return (
+    !isPattern &&
+    (_index3.match.call(void 0, _types3.TokenType.string) || // get "string"() {}
+      _index3.match.call(void 0, _types3.TokenType.num) || // get 1() {}
+      _index3.match.call(void 0, _types3.TokenType.bracketL) || // get ["string"]() {}
+      _index3.match.call(void 0, _types3.TokenType.name) || // get foo() {}
+      !!(_base.state.type & _types3.TokenType.IS_KEYWORD)) // get debugger() {}
+  );
+}
+
+// Returns true if this was a method.
+function parseObjectMethod(isPattern, objectContextId) {
+  // We don't need to worry about modifiers because object methods can't have optional bodies, so
+  // the start will never be used.
+  const functionStart = _base.state.start;
+  if (_index3.match.call(void 0, _types3.TokenType.parenL)) {
+    if (isPattern) _util.unexpected.call(void 0, );
+    parseMethod(functionStart, /* isConstructor */ false);
+    return true;
+  }
+
+  if (isGetterOrSetterMethod(isPattern)) {
+    parsePropertyName(objectContextId);
+    parseMethod(functionStart, /* isConstructor */ false);
+    return true;
+  }
+  return false;
+}
+
+function parseObjectProperty(isPattern, isBlockScope) {
+  if (_index3.eat.call(void 0, _types3.TokenType.colon)) {
+    if (isPattern) {
+      _lval.parseMaybeDefault.call(void 0, isBlockScope);
+    } else {
+      parseMaybeAssign(false);
+    }
+    return;
+  }
+
+  // Since there's no colon, we assume this is an object shorthand.
+
+  // If we're in a destructuring, we've now discovered that the key was actually an assignee, so
+  // we need to tag it as a declaration with the appropriate scope. Otherwise, we might need to
+  // transform it on access, so mark it as a normal object shorthand.
+  let identifierRole;
+  if (isPattern) {
+    if (_base.state.scopeDepth === 0) {
+      identifierRole = _index3.IdentifierRole.ObjectShorthandTopLevelDeclaration;
+    } else if (isBlockScope) {
+      identifierRole = _index3.IdentifierRole.ObjectShorthandBlockScopedDeclaration;
+    } else {
+      identifierRole = _index3.IdentifierRole.ObjectShorthandFunctionScopedDeclaration;
+    }
+  } else {
+    identifierRole = _index3.IdentifierRole.ObjectShorthand;
+  }
+  _base.state.tokens[_base.state.tokens.length - 1].identifierRole = identifierRole;
+
+  // Regardless of whether we know this to be a pattern or if we're in an ambiguous context, allow
+  // parsing as if there's a default value.
+  _lval.parseMaybeDefault.call(void 0, isBlockScope, true);
+}
+
+function parseObjPropValue(
+  isPattern,
+  isBlockScope,
+  objectContextId,
+) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsStartParseObjPropValue.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    _flow.flowStartParseObjPropValue.call(void 0, );
+  }
+  const wasMethod = parseObjectMethod(isPattern, objectContextId);
+  if (!wasMethod) {
+    parseObjectProperty(isPattern, isBlockScope);
+  }
+}
+
+ function parsePropertyName(objectContextId) {
+  if (_base.isFlowEnabled) {
+    _flow.flowParseVariance.call(void 0, );
+  }
+  if (_index3.eat.call(void 0, _types3.TokenType.bracketL)) {
+    _base.state.tokens[_base.state.tokens.length - 1].contextId = objectContextId;
+    parseMaybeAssign();
+    _util.expect.call(void 0, _types3.TokenType.bracketR);
+    _base.state.tokens[_base.state.tokens.length - 1].contextId = objectContextId;
+  } else {
+    if (_index3.match.call(void 0, _types3.TokenType.num) || _index3.match.call(void 0, _types3.TokenType.string) || _index3.match.call(void 0, _types3.TokenType.bigint) || _index3.match.call(void 0, _types3.TokenType.decimal)) {
+      parseExprAtom();
+    } else {
+      parseMaybePrivateName();
+    }
+
+    _base.state.tokens[_base.state.tokens.length - 1].identifierRole = _index3.IdentifierRole.ObjectKey;
+    _base.state.tokens[_base.state.tokens.length - 1].contextId = objectContextId;
+  }
+} exports.parsePropertyName = parsePropertyName;
+
+// Parse object or class method.
+ function parseMethod(functionStart, isConstructor) {
+  const funcContextId = _base.getNextContextId.call(void 0, );
+
+  _base.state.scopeDepth++;
+  const startTokenIndex = _base.state.tokens.length;
+  const allowModifiers = isConstructor; // For TypeScript parameter properties
+  _statement.parseFunctionParams.call(void 0, allowModifiers, funcContextId);
+  parseFunctionBodyAndFinish(functionStart, funcContextId);
+  const endTokenIndex = _base.state.tokens.length;
+  _base.state.scopes.push(new (0, _state.Scope)(startTokenIndex, endTokenIndex, true));
+  _base.state.scopeDepth--;
+} exports.parseMethod = parseMethod;
+
+// Parse arrow function expression.
+// If the parameters are provided, they will be converted to an
+// assignable list.
+ function parseArrowExpression(startTokenIndex) {
+  parseFunctionBody(true);
+  const endTokenIndex = _base.state.tokens.length;
+  _base.state.scopes.push(new (0, _state.Scope)(startTokenIndex, endTokenIndex, true));
+  _base.state.scopeDepth--;
+} exports.parseArrowExpression = parseArrowExpression;
+
+ function parseFunctionBodyAndFinish(functionStart, funcContextId = 0) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseFunctionBodyAndFinish.call(void 0, functionStart, funcContextId);
+  } else if (_base.isFlowEnabled) {
+    _flow.flowParseFunctionBodyAndFinish.call(void 0, funcContextId);
+  } else {
+    parseFunctionBody(false, funcContextId);
+  }
+} exports.parseFunctionBodyAndFinish = parseFunctionBodyAndFinish;
+
+ function parseFunctionBody(allowExpression, funcContextId = 0) {
+  const isExpression = allowExpression && !_index3.match.call(void 0, _types3.TokenType.braceL);
+
+  if (isExpression) {
+    parseMaybeAssign();
+  } else {
+    _statement.parseBlock.call(void 0, true /* isFunctionScope */, funcContextId);
+  }
+} exports.parseFunctionBody = parseFunctionBody;
+
+// Parses a comma-separated list of expressions, and returns them as
+// an array. `close` is the token type that ends the list, and
+// `allowEmpty` can be turned on to allow subsequent commas with
+// nothing in between them to be parsed as `null` (which is needed
+// for array literals).
+
+function parseExprList(close, allowEmpty = false) {
+  let first = true;
+  while (!_index3.eat.call(void 0, close) && !_base.state.error) {
+    if (first) {
+      first = false;
+    } else {
+      _util.expect.call(void 0, _types3.TokenType.comma);
+      if (_index3.eat.call(void 0, close)) break;
+    }
+    parseExprListItem(allowEmpty);
+  }
+}
+
+function parseExprListItem(allowEmpty) {
+  if (allowEmpty && _index3.match.call(void 0, _types3.TokenType.comma)) {
+    // Empty item; nothing more to parse for this item.
+  } else if (_index3.match.call(void 0, _types3.TokenType.ellipsis)) {
+    _lval.parseSpread.call(void 0, );
+    parseParenItem();
+  } else if (_index3.match.call(void 0, _types3.TokenType.question)) {
+    // Partial function application proposal.
+    _index3.next.call(void 0, );
+  } else {
+    parseMaybeAssign(false, true);
+  }
+}
+
+// Parse the next token as an identifier.
+ function parseIdentifier() {
+  _index3.next.call(void 0, );
+  _base.state.tokens[_base.state.tokens.length - 1].type = _types3.TokenType.name;
+} exports.parseIdentifier = parseIdentifier;
+
+// Parses await expression inside async function.
+function parseAwait() {
+  parseMaybeUnary();
+}
+
+// Parses yield expression inside generator.
+function parseYield() {
+  _index3.next.call(void 0, );
+  if (!_index3.match.call(void 0, _types3.TokenType.semi) && !_util.canInsertSemicolon.call(void 0, )) {
+    _index3.eat.call(void 0, _types3.TokenType.star);
+    parseMaybeAssign();
+  }
+}
+
+// https://github.com/tc39/proposal-js-module-blocks
+function parseModuleExpression() {
+  _util.expectContextual.call(void 0, _keywords.ContextualKeyword._module);
+  _util.expect.call(void 0, _types3.TokenType.braceL);
+  // For now, just call parseBlockBody to parse the block. In the future when we
+  // implement full support, we'll want to emit scopes and possibly other
+  // information.
+  _statement.parseBlockBody.call(void 0, _types3.TokenType.braceR);
+}
diff --git a/node_modules/sucrase/dist/parser/traverser/index.js b/node_modules/sucrase/dist/parser/traverser/index.js
new file mode 100644
index 0000000..72e4130
--- /dev/null
+++ b/node_modules/sucrase/dist/parser/traverser/index.js
@@ -0,0 +1,18 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true});
+var _index = require('../tokenizer/index');
+var _charcodes = require('../util/charcodes');
+var _base = require('./base');
+var _statement = require('./statement');
+
+ function parseFile() {
+  // If enabled, skip leading hashbang line.
+  if (
+    _base.state.pos === 0 &&
+    _base.input.charCodeAt(0) === _charcodes.charCodes.numberSign &&
+    _base.input.charCodeAt(1) === _charcodes.charCodes.exclamationMark
+  ) {
+    _index.skipLineComment.call(void 0, 2);
+  }
+  _index.nextToken.call(void 0, );
+  return _statement.parseTopLevel.call(void 0, );
+} exports.parseFile = parseFile;
diff --git a/node_modules/sucrase/dist/parser/traverser/lval.js b/node_modules/sucrase/dist/parser/traverser/lval.js
new file mode 100644
index 0000000..9057497
--- /dev/null
+++ b/node_modules/sucrase/dist/parser/traverser/lval.js
@@ -0,0 +1,159 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true});var _flow = require('../plugins/flow');
+var _typescript = require('../plugins/typescript');
+
+
+
+
+
+
+
+var _index = require('../tokenizer/index');
+var _keywords = require('../tokenizer/keywords');
+var _types = require('../tokenizer/types');
+var _base = require('./base');
+var _expression = require('./expression');
+var _util = require('./util');
+
+ function parseSpread() {
+  _index.next.call(void 0, );
+  _expression.parseMaybeAssign.call(void 0, false);
+} exports.parseSpread = parseSpread;
+
+ function parseRest(isBlockScope) {
+  _index.next.call(void 0, );
+  parseBindingAtom(isBlockScope);
+} exports.parseRest = parseRest;
+
+ function parseBindingIdentifier(isBlockScope) {
+  _expression.parseIdentifier.call(void 0, );
+  markPriorBindingIdentifier(isBlockScope);
+} exports.parseBindingIdentifier = parseBindingIdentifier;
+
+ function parseImportedIdentifier() {
+  _expression.parseIdentifier.call(void 0, );
+  _base.state.tokens[_base.state.tokens.length - 1].identifierRole = _index.IdentifierRole.ImportDeclaration;
+} exports.parseImportedIdentifier = parseImportedIdentifier;
+
+ function markPriorBindingIdentifier(isBlockScope) {
+  let identifierRole;
+  if (_base.state.scopeDepth === 0) {
+    identifierRole = _index.IdentifierRole.TopLevelDeclaration;
+  } else if (isBlockScope) {
+    identifierRole = _index.IdentifierRole.BlockScopedDeclaration;
+  } else {
+    identifierRole = _index.IdentifierRole.FunctionScopedDeclaration;
+  }
+  _base.state.tokens[_base.state.tokens.length - 1].identifierRole = identifierRole;
+} exports.markPriorBindingIdentifier = markPriorBindingIdentifier;
+
+// Parses lvalue (assignable) atom.
+ function parseBindingAtom(isBlockScope) {
+  switch (_base.state.type) {
+    case _types.TokenType._this: {
+      // In TypeScript, "this" may be the name of a parameter, so allow it.
+      const oldIsType = _index.pushTypeContext.call(void 0, 0);
+      _index.next.call(void 0, );
+      _index.popTypeContext.call(void 0, oldIsType);
+      return;
+    }
+
+    case _types.TokenType._yield:
+    case _types.TokenType.name: {
+      _base.state.type = _types.TokenType.name;
+      parseBindingIdentifier(isBlockScope);
+      return;
+    }
+
+    case _types.TokenType.bracketL: {
+      _index.next.call(void 0, );
+      parseBindingList(_types.TokenType.bracketR, isBlockScope, true /* allowEmpty */);
+      return;
+    }
+
+    case _types.TokenType.braceL:
+      _expression.parseObj.call(void 0, true, isBlockScope);
+      return;
+
+    default:
+      _util.unexpected.call(void 0, );
+  }
+} exports.parseBindingAtom = parseBindingAtom;
+
+ function parseBindingList(
+  close,
+  isBlockScope,
+  allowEmpty = false,
+  allowModifiers = false,
+  contextId = 0,
+) {
+  let first = true;
+
+  let hasRemovedComma = false;
+  const firstItemTokenIndex = _base.state.tokens.length;
+
+  while (!_index.eat.call(void 0, close) && !_base.state.error) {
+    if (first) {
+      first = false;
+    } else {
+      _util.expect.call(void 0, _types.TokenType.comma);
+      _base.state.tokens[_base.state.tokens.length - 1].contextId = contextId;
+      // After a "this" type in TypeScript, we need to set the following comma (if any) to also be
+      // a type token so that it will be removed.
+      if (!hasRemovedComma && _base.state.tokens[firstItemTokenIndex].isType) {
+        _base.state.tokens[_base.state.tokens.length - 1].isType = true;
+        hasRemovedComma = true;
+      }
+    }
+    if (allowEmpty && _index.match.call(void 0, _types.TokenType.comma)) {
+      // Empty item; nothing further to parse for this item.
+    } else if (_index.eat.call(void 0, close)) {
+      break;
+    } else if (_index.match.call(void 0, _types.TokenType.ellipsis)) {
+      parseRest(isBlockScope);
+      parseAssignableListItemTypes();
+      // Support rest element trailing commas allowed by TypeScript <2.9.
+      _index.eat.call(void 0, _types.TokenType.comma);
+      _util.expect.call(void 0, close);
+      break;
+    } else {
+      parseAssignableListItem(allowModifiers, isBlockScope);
+    }
+  }
+} exports.parseBindingList = parseBindingList;
+
+function parseAssignableListItem(allowModifiers, isBlockScope) {
+  if (allowModifiers) {
+    _typescript.tsParseModifiers.call(void 0, [
+      _keywords.ContextualKeyword._public,
+      _keywords.ContextualKeyword._protected,
+      _keywords.ContextualKeyword._private,
+      _keywords.ContextualKeyword._readonly,
+      _keywords.ContextualKeyword._override,
+    ]);
+  }
+
+  parseMaybeDefault(isBlockScope);
+  parseAssignableListItemTypes();
+  parseMaybeDefault(isBlockScope, true /* leftAlreadyParsed */);
+}
+
+function parseAssignableListItemTypes() {
+  if (_base.isFlowEnabled) {
+    _flow.flowParseAssignableListItemTypes.call(void 0, );
+  } else if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseAssignableListItemTypes.call(void 0, );
+  }
+}
+
+// Parses assignment pattern around given atom if possible.
+ function parseMaybeDefault(isBlockScope, leftAlreadyParsed = false) {
+  if (!leftAlreadyParsed) {
+    parseBindingAtom(isBlockScope);
+  }
+  if (!_index.eat.call(void 0, _types.TokenType.eq)) {
+    return;
+  }
+  const eqIndex = _base.state.tokens.length - 1;
+  _expression.parseMaybeAssign.call(void 0, );
+  _base.state.tokens[eqIndex].rhsEndIndex = _base.state.tokens.length;
+} exports.parseMaybeDefault = parseMaybeDefault;
diff --git a/node_modules/sucrase/dist/parser/traverser/statement.js b/node_modules/sucrase/dist/parser/traverser/statement.js
new file mode 100644
index 0000000..6be3391
--- /dev/null
+++ b/node_modules/sucrase/dist/parser/traverser/statement.js
@@ -0,0 +1,1332 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true});/* eslint max-len: 0 */
+
+var _index = require('../index');
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+var _flow = require('../plugins/flow');
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+var _typescript = require('../plugins/typescript');
+
+
+
+
+
+
+
+
+
+
+
+
+var _tokenizer = require('../tokenizer');
+var _keywords = require('../tokenizer/keywords');
+var _state = require('../tokenizer/state');
+var _types = require('../tokenizer/types');
+var _charcodes = require('../util/charcodes');
+var _base = require('./base');
+
+
+
+
+
+
+
+
+
+
+
+
+var _expression = require('./expression');
+
+
+
+
+
+var _lval = require('./lval');
+
+
+
+
+
+
+
+
+
+
+
+
+var _util = require('./util');
+
+ function parseTopLevel() {
+  parseBlockBody(_types.TokenType.eof);
+  _base.state.scopes.push(new (0, _state.Scope)(0, _base.state.tokens.length, true));
+  if (_base.state.scopeDepth !== 0) {
+    throw new Error(`Invalid scope depth at end of file: ${_base.state.scopeDepth}`);
+  }
+  return new (0, _index.File)(_base.state.tokens, _base.state.scopes);
+} exports.parseTopLevel = parseTopLevel;
+
+// Parse a single statement.
+//
+// If expecting a statement and finding a slash operator, parse a
+// regular expression literal. This is to handle cases like
+// `if (foo) /blah/.exec(foo)`, where looking at the previous token
+// does not help.
+
+ function parseStatement(declaration) {
+  if (_base.isFlowEnabled) {
+    if (_flow.flowTryParseStatement.call(void 0, )) {
+      return;
+    }
+  }
+  if (_tokenizer.match.call(void 0, _types.TokenType.at)) {
+    parseDecorators();
+  }
+  parseStatementContent(declaration);
+} exports.parseStatement = parseStatement;
+
+function parseStatementContent(declaration) {
+  if (_base.isTypeScriptEnabled) {
+    if (_typescript.tsTryParseStatementContent.call(void 0, )) {
+      return;
+    }
+  }
+
+  const starttype = _base.state.type;
+
+  // Most types of statements are recognized by the keyword they
+  // start with. Many are trivial to parse, some require a bit of
+  // complexity.
+
+  switch (starttype) {
+    case _types.TokenType._break:
+    case _types.TokenType._continue:
+      parseBreakContinueStatement();
+      return;
+    case _types.TokenType._debugger:
+      parseDebuggerStatement();
+      return;
+    case _types.TokenType._do:
+      parseDoStatement();
+      return;
+    case _types.TokenType._for:
+      parseForStatement();
+      return;
+    case _types.TokenType._function:
+      if (_tokenizer.lookaheadType.call(void 0, ) === _types.TokenType.dot) break;
+      if (!declaration) _util.unexpected.call(void 0, );
+      parseFunctionStatement();
+      return;
+
+    case _types.TokenType._class:
+      if (!declaration) _util.unexpected.call(void 0, );
+      parseClass(true);
+      return;
+
+    case _types.TokenType._if:
+      parseIfStatement();
+      return;
+    case _types.TokenType._return:
+      parseReturnStatement();
+      return;
+    case _types.TokenType._switch:
+      parseSwitchStatement();
+      return;
+    case _types.TokenType._throw:
+      parseThrowStatement();
+      return;
+    case _types.TokenType._try:
+      parseTryStatement();
+      return;
+
+    case _types.TokenType._let:
+    case _types.TokenType._const:
+      if (!declaration) _util.unexpected.call(void 0, ); // NOTE: falls through to _var
+
+    case _types.TokenType._var:
+      parseVarStatement(starttype !== _types.TokenType._var);
+      return;
+
+    case _types.TokenType._while:
+      parseWhileStatement();
+      return;
+    case _types.TokenType.braceL:
+      parseBlock();
+      return;
+    case _types.TokenType.semi:
+      parseEmptyStatement();
+      return;
+    case _types.TokenType._export:
+    case _types.TokenType._import: {
+      const nextType = _tokenizer.lookaheadType.call(void 0, );
+      if (nextType === _types.TokenType.parenL || nextType === _types.TokenType.dot) {
+        break;
+      }
+      _tokenizer.next.call(void 0, );
+      if (starttype === _types.TokenType._import) {
+        parseImport();
+      } else {
+        parseExport();
+      }
+      return;
+    }
+    case _types.TokenType.name:
+      if (_base.state.contextualKeyword === _keywords.ContextualKeyword._async) {
+        const functionStart = _base.state.start;
+        // peek ahead and see if next token is a function
+        const snapshot = _base.state.snapshot();
+        _tokenizer.next.call(void 0, );
+        if (_tokenizer.match.call(void 0, _types.TokenType._function) && !_util.canInsertSemicolon.call(void 0, )) {
+          _util.expect.call(void 0, _types.TokenType._function);
+          parseFunction(functionStart, true);
+          return;
+        } else {
+          _base.state.restoreFromSnapshot(snapshot);
+        }
+      } else if (
+        _base.state.contextualKeyword === _keywords.ContextualKeyword._using &&
+        !_util.hasFollowingLineBreak.call(void 0, ) &&
+        // Statements like `using[0]` and `using in foo` aren't actual using
+        // declarations.
+        _tokenizer.lookaheadType.call(void 0, ) === _types.TokenType.name
+      ) {
+        parseVarStatement(true);
+        return;
+      } else if (startsAwaitUsing()) {
+        _util.expectContextual.call(void 0, _keywords.ContextualKeyword._await);
+        parseVarStatement(true);
+        return;
+      }
+    default:
+      // Do nothing.
+      break;
+  }
+
+  // If the statement does not start with a statement keyword or a
+  // brace, it's an ExpressionStatement or LabeledStatement. We
+  // simply start parsing an expression, and afterwards, if the
+  // next token is a colon and the expression was a simple
+  // Identifier node, we switch to interpreting it as a label.
+  const initialTokensLength = _base.state.tokens.length;
+  _expression.parseExpression.call(void 0, );
+  let simpleName = null;
+  if (_base.state.tokens.length === initialTokensLength + 1) {
+    const token = _base.state.tokens[_base.state.tokens.length - 1];
+    if (token.type === _types.TokenType.name) {
+      simpleName = token.contextualKeyword;
+    }
+  }
+  if (simpleName == null) {
+    _util.semicolon.call(void 0, );
+    return;
+  }
+  if (_tokenizer.eat.call(void 0, _types.TokenType.colon)) {
+    parseLabeledStatement();
+  } else {
+    // This was an identifier, so we might want to handle flow/typescript-specific cases.
+    parseIdentifierStatement(simpleName);
+  }
+}
+
+/**
+ * Determine if we're positioned at an `await using` declaration.
+ *
+ * Note that this can happen either in place of a regular variable declaration
+ * or in a loop body, and in both places, there are similar-looking cases where
+ * we need to return false.
+ *
+ * Examples returning true:
+ * await using foo = bar();
+ * for (await using a of b) {}
+ *
+ * Examples returning false:
+ * await using
+ * await using + 1
+ * await using instanceof T
+ * for (await using;;) {}
+ *
+ * For now, we early return if we don't see `await`, then do a simple
+ * backtracking-based lookahead for the `using` and identifier tokens. In the
+ * future, this could be optimized with a character-based approach.
+ */
+function startsAwaitUsing() {
+  if (!_util.isContextual.call(void 0, _keywords.ContextualKeyword._await)) {
+    return false;
+  }
+  const snapshot = _base.state.snapshot();
+  // await
+  _tokenizer.next.call(void 0, );
+  if (!_util.isContextual.call(void 0, _keywords.ContextualKeyword._using) || _util.hasPrecedingLineBreak.call(void 0, )) {
+    _base.state.restoreFromSnapshot(snapshot);
+    return false;
+  }
+  // using
+  _tokenizer.next.call(void 0, );
+  if (!_tokenizer.match.call(void 0, _types.TokenType.name) || _util.hasPrecedingLineBreak.call(void 0, )) {
+    _base.state.restoreFromSnapshot(snapshot);
+    return false;
+  }
+  _base.state.restoreFromSnapshot(snapshot);
+  return true;
+}
+
+ function parseDecorators() {
+  while (_tokenizer.match.call(void 0, _types.TokenType.at)) {
+    parseDecorator();
+  }
+} exports.parseDecorators = parseDecorators;
+
+function parseDecorator() {
+  _tokenizer.next.call(void 0, );
+  if (_tokenizer.eat.call(void 0, _types.TokenType.parenL)) {
+    _expression.parseExpression.call(void 0, );
+    _util.expect.call(void 0, _types.TokenType.parenR);
+  } else {
+    _expression.parseIdentifier.call(void 0, );
+    while (_tokenizer.eat.call(void 0, _types.TokenType.dot)) {
+      _expression.parseIdentifier.call(void 0, );
+    }
+    parseMaybeDecoratorArguments();
+  }
+}
+
+function parseMaybeDecoratorArguments() {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseMaybeDecoratorArguments.call(void 0, );
+  } else {
+    baseParseMaybeDecoratorArguments();
+  }
+}
+
+ function baseParseMaybeDecoratorArguments() {
+  if (_tokenizer.eat.call(void 0, _types.TokenType.parenL)) {
+    _expression.parseCallExpressionArguments.call(void 0, );
+  }
+} exports.baseParseMaybeDecoratorArguments = baseParseMaybeDecoratorArguments;
+
+function parseBreakContinueStatement() {
+  _tokenizer.next.call(void 0, );
+  if (!_util.isLineTerminator.call(void 0, )) {
+    _expression.parseIdentifier.call(void 0, );
+    _util.semicolon.call(void 0, );
+  }
+}
+
+function parseDebuggerStatement() {
+  _tokenizer.next.call(void 0, );
+  _util.semicolon.call(void 0, );
+}
+
+function parseDoStatement() {
+  _tokenizer.next.call(void 0, );
+  parseStatement(false);
+  _util.expect.call(void 0, _types.TokenType._while);
+  _expression.parseParenExpression.call(void 0, );
+  _tokenizer.eat.call(void 0, _types.TokenType.semi);
+}
+
+function parseForStatement() {
+  _base.state.scopeDepth++;
+  const startTokenIndex = _base.state.tokens.length;
+  parseAmbiguousForStatement();
+  const endTokenIndex = _base.state.tokens.length;
+  _base.state.scopes.push(new (0, _state.Scope)(startTokenIndex, endTokenIndex, false));
+  _base.state.scopeDepth--;
+}
+
+/**
+ * Determine if this token is a `using` declaration (explicit resource
+ * management) as part of a loop.
+ * https://github.com/tc39/proposal-explicit-resource-management
+ */
+function isUsingInLoop() {
+  if (!_util.isContextual.call(void 0, _keywords.ContextualKeyword._using)) {
+    return false;
+  }
+  // This must be `for (using of`, where `using` is the name of the loop
+  // variable.
+  if (_util.isLookaheadContextual.call(void 0, _keywords.ContextualKeyword._of)) {
+    return false;
+  }
+  return true;
+}
+
+// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
+// loop is non-trivial. Basically, we have to parse the init `var`
+// statement or expression, disallowing the `in` operator (see
+// the second parameter to `parseExpression`), and then check
+// whether the next token is `in` or `of`. When there is no init
+// part (semicolon immediately after the opening parenthesis), it
+// is a regular `for` loop.
+function parseAmbiguousForStatement() {
+  _tokenizer.next.call(void 0, );
+
+  let forAwait = false;
+  if (_util.isContextual.call(void 0, _keywords.ContextualKeyword._await)) {
+    forAwait = true;
+    _tokenizer.next.call(void 0, );
+  }
+  _util.expect.call(void 0, _types.TokenType.parenL);
+
+  if (_tokenizer.match.call(void 0, _types.TokenType.semi)) {
+    if (forAwait) {
+      _util.unexpected.call(void 0, );
+    }
+    parseFor();
+    return;
+  }
+
+  const isAwaitUsing = startsAwaitUsing();
+  if (isAwaitUsing || _tokenizer.match.call(void 0, _types.TokenType._var) || _tokenizer.match.call(void 0, _types.TokenType._let) || _tokenizer.match.call(void 0, _types.TokenType._const) || isUsingInLoop()) {
+    if (isAwaitUsing) {
+      _util.expectContextual.call(void 0, _keywords.ContextualKeyword._await);
+    }
+    _tokenizer.next.call(void 0, );
+    parseVar(true, _base.state.type !== _types.TokenType._var);
+    if (_tokenizer.match.call(void 0, _types.TokenType._in) || _util.isContextual.call(void 0, _keywords.ContextualKeyword._of)) {
+      parseForIn(forAwait);
+      return;
+    }
+    parseFor();
+    return;
+  }
+
+  _expression.parseExpression.call(void 0, true);
+  if (_tokenizer.match.call(void 0, _types.TokenType._in) || _util.isContextual.call(void 0, _keywords.ContextualKeyword._of)) {
+    parseForIn(forAwait);
+    return;
+  }
+  if (forAwait) {
+    _util.unexpected.call(void 0, );
+  }
+  parseFor();
+}
+
+function parseFunctionStatement() {
+  const functionStart = _base.state.start;
+  _tokenizer.next.call(void 0, );
+  parseFunction(functionStart, true);
+}
+
+function parseIfStatement() {
+  _tokenizer.next.call(void 0, );
+  _expression.parseParenExpression.call(void 0, );
+  parseStatement(false);
+  if (_tokenizer.eat.call(void 0, _types.TokenType._else)) {
+    parseStatement(false);
+  }
+}
+
+function parseReturnStatement() {
+  _tokenizer.next.call(void 0, );
+
+  // In `return` (and `break`/`continue`), the keywords with
+  // optional arguments, we eagerly look for a semicolon or the
+  // possibility to insert one.
+
+  if (!_util.isLineTerminator.call(void 0, )) {
+    _expression.parseExpression.call(void 0, );
+    _util.semicolon.call(void 0, );
+  }
+}
+
+function parseSwitchStatement() {
+  _tokenizer.next.call(void 0, );
+  _expression.parseParenExpression.call(void 0, );
+  _base.state.scopeDepth++;
+  const startTokenIndex = _base.state.tokens.length;
+  _util.expect.call(void 0, _types.TokenType.braceL);
+
+  // Don't bother validation; just go through any sequence of cases, defaults, and statements.
+  while (!_tokenizer.match.call(void 0, _types.TokenType.braceR) && !_base.state.error) {
+    if (_tokenizer.match.call(void 0, _types.TokenType._case) || _tokenizer.match.call(void 0, _types.TokenType._default)) {
+      const isCase = _tokenizer.match.call(void 0, _types.TokenType._case);
+      _tokenizer.next.call(void 0, );
+      if (isCase) {
+        _expression.parseExpression.call(void 0, );
+      }
+      _util.expect.call(void 0, _types.TokenType.colon);
+    } else {
+      parseStatement(true);
+    }
+  }
+  _tokenizer.next.call(void 0, ); // Closing brace
+  const endTokenIndex = _base.state.tokens.length;
+  _base.state.scopes.push(new (0, _state.Scope)(startTokenIndex, endTokenIndex, false));
+  _base.state.scopeDepth--;
+}
+
+function parseThrowStatement() {
+  _tokenizer.next.call(void 0, );
+  _expression.parseExpression.call(void 0, );
+  _util.semicolon.call(void 0, );
+}
+
+function parseCatchClauseParam() {
+  _lval.parseBindingAtom.call(void 0, true /* isBlockScope */);
+
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsTryParseTypeAnnotation.call(void 0, );
+  }
+}
+
+function parseTryStatement() {
+  _tokenizer.next.call(void 0, );
+
+  parseBlock();
+
+  if (_tokenizer.match.call(void 0, _types.TokenType._catch)) {
+    _tokenizer.next.call(void 0, );
+    let catchBindingStartTokenIndex = null;
+    if (_tokenizer.match.call(void 0, _types.TokenType.parenL)) {
+      _base.state.scopeDepth++;
+      catchBindingStartTokenIndex = _base.state.tokens.length;
+      _util.expect.call(void 0, _types.TokenType.parenL);
+      parseCatchClauseParam();
+      _util.expect.call(void 0, _types.TokenType.parenR);
+    }
+    parseBlock();
+    if (catchBindingStartTokenIndex != null) {
+      // We need a special scope for the catch binding which includes the binding itself and the
+      // catch block.
+      const endTokenIndex = _base.state.tokens.length;
+      _base.state.scopes.push(new (0, _state.Scope)(catchBindingStartTokenIndex, endTokenIndex, false));
+      _base.state.scopeDepth--;
+    }
+  }
+  if (_tokenizer.eat.call(void 0, _types.TokenType._finally)) {
+    parseBlock();
+  }
+}
+
+ function parseVarStatement(isBlockScope) {
+  _tokenizer.next.call(void 0, );
+  parseVar(false, isBlockScope);
+  _util.semicolon.call(void 0, );
+} exports.parseVarStatement = parseVarStatement;
+
+function parseWhileStatement() {
+  _tokenizer.next.call(void 0, );
+  _expression.parseParenExpression.call(void 0, );
+  parseStatement(false);
+}
+
+function parseEmptyStatement() {
+  _tokenizer.next.call(void 0, );
+}
+
+function parseLabeledStatement() {
+  parseStatement(true);
+}
+
+/**
+ * Parse a statement starting with an identifier of the given name. Subclasses match on the name
+ * to handle statements like "declare".
+ */
+function parseIdentifierStatement(contextualKeyword) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseIdentifierStatement.call(void 0, contextualKeyword);
+  } else if (_base.isFlowEnabled) {
+    _flow.flowParseIdentifierStatement.call(void 0, contextualKeyword);
+  } else {
+    _util.semicolon.call(void 0, );
+  }
+}
+
+// Parse a semicolon-enclosed block of statements.
+ function parseBlock(isFunctionScope = false, contextId = 0) {
+  const startTokenIndex = _base.state.tokens.length;
+  _base.state.scopeDepth++;
+  _util.expect.call(void 0, _types.TokenType.braceL);
+  if (contextId) {
+    _base.state.tokens[_base.state.tokens.length - 1].contextId = contextId;
+  }
+  parseBlockBody(_types.TokenType.braceR);
+  if (contextId) {
+    _base.state.tokens[_base.state.tokens.length - 1].contextId = contextId;
+  }
+  const endTokenIndex = _base.state.tokens.length;
+  _base.state.scopes.push(new (0, _state.Scope)(startTokenIndex, endTokenIndex, isFunctionScope));
+  _base.state.scopeDepth--;
+} exports.parseBlock = parseBlock;
+
+ function parseBlockBody(end) {
+  while (!_tokenizer.eat.call(void 0, end) && !_base.state.error) {
+    parseStatement(true);
+  }
+} exports.parseBlockBody = parseBlockBody;
+
+// Parse a regular `for` loop. The disambiguation code in
+// `parseStatement` will already have parsed the init statement or
+// expression.
+
+function parseFor() {
+  _util.expect.call(void 0, _types.TokenType.semi);
+  if (!_tokenizer.match.call(void 0, _types.TokenType.semi)) {
+    _expression.parseExpression.call(void 0, );
+  }
+  _util.expect.call(void 0, _types.TokenType.semi);
+  if (!_tokenizer.match.call(void 0, _types.TokenType.parenR)) {
+    _expression.parseExpression.call(void 0, );
+  }
+  _util.expect.call(void 0, _types.TokenType.parenR);
+  parseStatement(false);
+}
+
+// Parse a `for`/`in` and `for`/`of` loop, which are almost
+// same from parser's perspective.
+
+function parseForIn(forAwait) {
+  if (forAwait) {
+    _util.eatContextual.call(void 0, _keywords.ContextualKeyword._of);
+  } else {
+    _tokenizer.next.call(void 0, );
+  }
+  _expression.parseExpression.call(void 0, );
+  _util.expect.call(void 0, _types.TokenType.parenR);
+  parseStatement(false);
+}
+
+// Parse a list of variable declarations.
+
+function parseVar(isFor, isBlockScope) {
+  while (true) {
+    parseVarHead(isBlockScope);
+    if (_tokenizer.eat.call(void 0, _types.TokenType.eq)) {
+      const eqIndex = _base.state.tokens.length - 1;
+      _expression.parseMaybeAssign.call(void 0, isFor);
+      _base.state.tokens[eqIndex].rhsEndIndex = _base.state.tokens.length;
+    }
+    if (!_tokenizer.eat.call(void 0, _types.TokenType.comma)) {
+      break;
+    }
+  }
+}
+
+function parseVarHead(isBlockScope) {
+  _lval.parseBindingAtom.call(void 0, isBlockScope);
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsAfterParseVarHead.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    _flow.flowAfterParseVarHead.call(void 0, );
+  }
+}
+
+// Parse a function declaration or literal (depending on the
+// `isStatement` parameter).
+
+ function parseFunction(
+  functionStart,
+  isStatement,
+  optionalId = false,
+) {
+  if (_tokenizer.match.call(void 0, _types.TokenType.star)) {
+    _tokenizer.next.call(void 0, );
+  }
+
+  if (isStatement && !optionalId && !_tokenizer.match.call(void 0, _types.TokenType.name) && !_tokenizer.match.call(void 0, _types.TokenType._yield)) {
+    _util.unexpected.call(void 0, );
+  }
+
+  let nameScopeStartTokenIndex = null;
+
+  if (_tokenizer.match.call(void 0, _types.TokenType.name)) {
+    // Expression-style functions should limit their name's scope to the function body, so we make
+    // a new function scope to enforce that.
+    if (!isStatement) {
+      nameScopeStartTokenIndex = _base.state.tokens.length;
+      _base.state.scopeDepth++;
+    }
+    _lval.parseBindingIdentifier.call(void 0, false);
+  }
+
+  const startTokenIndex = _base.state.tokens.length;
+  _base.state.scopeDepth++;
+  parseFunctionParams();
+  _expression.parseFunctionBodyAndFinish.call(void 0, functionStart);
+  const endTokenIndex = _base.state.tokens.length;
+  // In addition to the block scope of the function body, we need a separate function-style scope
+  // that includes the params.
+  _base.state.scopes.push(new (0, _state.Scope)(startTokenIndex, endTokenIndex, true));
+  _base.state.scopeDepth--;
+  if (nameScopeStartTokenIndex !== null) {
+    _base.state.scopes.push(new (0, _state.Scope)(nameScopeStartTokenIndex, endTokenIndex, true));
+    _base.state.scopeDepth--;
+  }
+} exports.parseFunction = parseFunction;
+
+ function parseFunctionParams(
+  allowModifiers = false,
+  funcContextId = 0,
+) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsStartParseFunctionParams.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    _flow.flowStartParseFunctionParams.call(void 0, );
+  }
+
+  _util.expect.call(void 0, _types.TokenType.parenL);
+  if (funcContextId) {
+    _base.state.tokens[_base.state.tokens.length - 1].contextId = funcContextId;
+  }
+  _lval.parseBindingList.call(void 0, 
+    _types.TokenType.parenR,
+    false /* isBlockScope */,
+    false /* allowEmpty */,
+    allowModifiers,
+    funcContextId,
+  );
+  if (funcContextId) {
+    _base.state.tokens[_base.state.tokens.length - 1].contextId = funcContextId;
+  }
+} exports.parseFunctionParams = parseFunctionParams;
+
+// Parse a class declaration or literal (depending on the
+// `isStatement` parameter).
+
+ function parseClass(isStatement, optionalId = false) {
+  // Put a context ID on the class keyword, the open-brace, and the close-brace, so that later
+  // code can easily navigate to meaningful points on the class.
+  const contextId = _base.getNextContextId.call(void 0, );
+
+  _tokenizer.next.call(void 0, );
+  _base.state.tokens[_base.state.tokens.length - 1].contextId = contextId;
+  _base.state.tokens[_base.state.tokens.length - 1].isExpression = !isStatement;
+  // Like with functions, we declare a special "name scope" from the start of the name to the end
+  // of the class, but only with expression-style classes, to represent the fact that the name is
+  // available to the body of the class but not an outer declaration.
+  let nameScopeStartTokenIndex = null;
+  if (!isStatement) {
+    nameScopeStartTokenIndex = _base.state.tokens.length;
+    _base.state.scopeDepth++;
+  }
+  parseClassId(isStatement, optionalId);
+  parseClassSuper();
+  const openBraceIndex = _base.state.tokens.length;
+  parseClassBody(contextId);
+  if (_base.state.error) {
+    return;
+  }
+  _base.state.tokens[openBraceIndex].contextId = contextId;
+  _base.state.tokens[_base.state.tokens.length - 1].contextId = contextId;
+  if (nameScopeStartTokenIndex !== null) {
+    const endTokenIndex = _base.state.tokens.length;
+    _base.state.scopes.push(new (0, _state.Scope)(nameScopeStartTokenIndex, endTokenIndex, false));
+    _base.state.scopeDepth--;
+  }
+} exports.parseClass = parseClass;
+
+function isClassProperty() {
+  return _tokenizer.match.call(void 0, _types.TokenType.eq) || _tokenizer.match.call(void 0, _types.TokenType.semi) || _tokenizer.match.call(void 0, _types.TokenType.braceR) || _tokenizer.match.call(void 0, _types.TokenType.bang) || _tokenizer.match.call(void 0, _types.TokenType.colon);
+}
+
+function isClassMethod() {
+  return _tokenizer.match.call(void 0, _types.TokenType.parenL) || _tokenizer.match.call(void 0, _types.TokenType.lessThan);
+}
+
+function parseClassBody(classContextId) {
+  _util.expect.call(void 0, _types.TokenType.braceL);
+
+  while (!_tokenizer.eat.call(void 0, _types.TokenType.braceR) && !_base.state.error) {
+    if (_tokenizer.eat.call(void 0, _types.TokenType.semi)) {
+      continue;
+    }
+
+    if (_tokenizer.match.call(void 0, _types.TokenType.at)) {
+      parseDecorator();
+      continue;
+    }
+    const memberStart = _base.state.start;
+    parseClassMember(memberStart, classContextId);
+  }
+}
+
+function parseClassMember(memberStart, classContextId) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseModifiers.call(void 0, [
+      _keywords.ContextualKeyword._declare,
+      _keywords.ContextualKeyword._public,
+      _keywords.ContextualKeyword._protected,
+      _keywords.ContextualKeyword._private,
+      _keywords.ContextualKeyword._override,
+    ]);
+  }
+  let isStatic = false;
+  if (_tokenizer.match.call(void 0, _types.TokenType.name) && _base.state.contextualKeyword === _keywords.ContextualKeyword._static) {
+    _expression.parseIdentifier.call(void 0, ); // eats 'static'
+    if (isClassMethod()) {
+      parseClassMethod(memberStart, /* isConstructor */ false);
+      return;
+    } else if (isClassProperty()) {
+      parseClassProperty();
+      return;
+    }
+    // otherwise something static
+    _base.state.tokens[_base.state.tokens.length - 1].type = _types.TokenType._static;
+    isStatic = true;
+
+    if (_tokenizer.match.call(void 0, _types.TokenType.braceL)) {
+      // This is a static block. Mark the word "static" with the class context ID for class element
+      // detection and parse as a regular block.
+      _base.state.tokens[_base.state.tokens.length - 1].contextId = classContextId;
+      parseBlock();
+      return;
+    }
+  }
+
+  parseClassMemberWithIsStatic(memberStart, isStatic, classContextId);
+}
+
+function parseClassMemberWithIsStatic(
+  memberStart,
+  isStatic,
+  classContextId,
+) {
+  if (_base.isTypeScriptEnabled) {
+    if (_typescript.tsTryParseClassMemberWithIsStatic.call(void 0, isStatic)) {
+      return;
+    }
+  }
+  if (_tokenizer.eat.call(void 0, _types.TokenType.star)) {
+    // a generator
+    parseClassPropertyName(classContextId);
+    parseClassMethod(memberStart, /* isConstructor */ false);
+    return;
+  }
+
+  // Get the identifier name so we can tell if it's actually a keyword like "async", "get", or
+  // "set".
+  parseClassPropertyName(classContextId);
+  let isConstructor = false;
+  const token = _base.state.tokens[_base.state.tokens.length - 1];
+  // We allow "constructor" as either an identifier or a string.
+  if (token.contextualKeyword === _keywords.ContextualKeyword._constructor) {
+    isConstructor = true;
+  }
+  parsePostMemberNameModifiers();
+
+  if (isClassMethod()) {
+    parseClassMethod(memberStart, isConstructor);
+  } else if (isClassProperty()) {
+    parseClassProperty();
+  } else if (token.contextualKeyword === _keywords.ContextualKeyword._async && !_util.isLineTerminator.call(void 0, )) {
+    _base.state.tokens[_base.state.tokens.length - 1].type = _types.TokenType._async;
+    // an async method
+    const isGenerator = _tokenizer.match.call(void 0, _types.TokenType.star);
+    if (isGenerator) {
+      _tokenizer.next.call(void 0, );
+    }
+
+    // The so-called parsed name would have been "async": get the real name.
+    parseClassPropertyName(classContextId);
+    parsePostMemberNameModifiers();
+    parseClassMethod(memberStart, false /* isConstructor */);
+  } else if (
+    (token.contextualKeyword === _keywords.ContextualKeyword._get ||
+      token.contextualKeyword === _keywords.ContextualKeyword._set) &&
+    !(_util.isLineTerminator.call(void 0, ) && _tokenizer.match.call(void 0, _types.TokenType.star))
+  ) {
+    if (token.contextualKeyword === _keywords.ContextualKeyword._get) {
+      _base.state.tokens[_base.state.tokens.length - 1].type = _types.TokenType._get;
+    } else {
+      _base.state.tokens[_base.state.tokens.length - 1].type = _types.TokenType._set;
+    }
+    // `get\n*` is an uninitialized property named 'get' followed by a generator.
+    // a getter or setter
+    // The so-called parsed name would have been "get/set": get the real name.
+    parseClassPropertyName(classContextId);
+    parseClassMethod(memberStart, /* isConstructor */ false);
+  } else if (token.contextualKeyword === _keywords.ContextualKeyword._accessor && !_util.isLineTerminator.call(void 0, )) {
+    parseClassPropertyName(classContextId);
+    parseClassProperty();
+  } else if (_util.isLineTerminator.call(void 0, )) {
+    // an uninitialized class property (due to ASI, since we don't otherwise recognize the next token)
+    parseClassProperty();
+  } else {
+    _util.unexpected.call(void 0, );
+  }
+}
+
+function parseClassMethod(functionStart, isConstructor) {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsTryParseTypeParameters.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    if (_tokenizer.match.call(void 0, _types.TokenType.lessThan)) {
+      _flow.flowParseTypeParameterDeclaration.call(void 0, );
+    }
+  }
+  _expression.parseMethod.call(void 0, functionStart, isConstructor);
+}
+
+// Return the name of the class property, if it is a simple identifier.
+ function parseClassPropertyName(classContextId) {
+  _expression.parsePropertyName.call(void 0, classContextId);
+} exports.parseClassPropertyName = parseClassPropertyName;
+
+ function parsePostMemberNameModifiers() {
+  if (_base.isTypeScriptEnabled) {
+    const oldIsType = _tokenizer.pushTypeContext.call(void 0, 0);
+    _tokenizer.eat.call(void 0, _types.TokenType.question);
+    _tokenizer.popTypeContext.call(void 0, oldIsType);
+  }
+} exports.parsePostMemberNameModifiers = parsePostMemberNameModifiers;
+
+ function parseClassProperty() {
+  if (_base.isTypeScriptEnabled) {
+    _tokenizer.eatTypeToken.call(void 0, _types.TokenType.bang);
+    _typescript.tsTryParseTypeAnnotation.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    if (_tokenizer.match.call(void 0, _types.TokenType.colon)) {
+      _flow.flowParseTypeAnnotation.call(void 0, );
+    }
+  }
+
+  if (_tokenizer.match.call(void 0, _types.TokenType.eq)) {
+    const equalsTokenIndex = _base.state.tokens.length;
+    _tokenizer.next.call(void 0, );
+    _expression.parseMaybeAssign.call(void 0, );
+    _base.state.tokens[equalsTokenIndex].rhsEndIndex = _base.state.tokens.length;
+  }
+  _util.semicolon.call(void 0, );
+} exports.parseClassProperty = parseClassProperty;
+
+function parseClassId(isStatement, optionalId = false) {
+  if (
+    _base.isTypeScriptEnabled &&
+    (!isStatement || optionalId) &&
+    _util.isContextual.call(void 0, _keywords.ContextualKeyword._implements)
+  ) {
+    return;
+  }
+
+  if (_tokenizer.match.call(void 0, _types.TokenType.name)) {
+    _lval.parseBindingIdentifier.call(void 0, true);
+  }
+
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsTryParseTypeParameters.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    if (_tokenizer.match.call(void 0, _types.TokenType.lessThan)) {
+      _flow.flowParseTypeParameterDeclaration.call(void 0, );
+    }
+  }
+}
+
+// Returns true if there was a superclass.
+function parseClassSuper() {
+  let hasSuper = false;
+  if (_tokenizer.eat.call(void 0, _types.TokenType._extends)) {
+    _expression.parseExprSubscripts.call(void 0, );
+    hasSuper = true;
+  } else {
+    hasSuper = false;
+  }
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsAfterParseClassSuper.call(void 0, hasSuper);
+  } else if (_base.isFlowEnabled) {
+    _flow.flowAfterParseClassSuper.call(void 0, hasSuper);
+  }
+}
+
+// Parses module export declaration.
+
+ function parseExport() {
+  const exportIndex = _base.state.tokens.length - 1;
+  if (_base.isTypeScriptEnabled) {
+    if (_typescript.tsTryParseExport.call(void 0, )) {
+      return;
+    }
+  }
+  // export * from '...'
+  if (shouldParseExportStar()) {
+    parseExportStar();
+  } else if (isExportDefaultSpecifier()) {
+    // export default from
+    _expression.parseIdentifier.call(void 0, );
+    if (_tokenizer.match.call(void 0, _types.TokenType.comma) && _tokenizer.lookaheadType.call(void 0, ) === _types.TokenType.star) {
+      _util.expect.call(void 0, _types.TokenType.comma);
+      _util.expect.call(void 0, _types.TokenType.star);
+      _util.expectContextual.call(void 0, _keywords.ContextualKeyword._as);
+      _expression.parseIdentifier.call(void 0, );
+    } else {
+      parseExportSpecifiersMaybe();
+    }
+    parseExportFrom();
+  } else if (_tokenizer.eat.call(void 0, _types.TokenType._default)) {
+    // export default ...
+    parseExportDefaultExpression();
+  } else if (shouldParseExportDeclaration()) {
+    parseExportDeclaration();
+  } else {
+    // export { x, y as z } [from '...']
+    parseExportSpecifiers();
+    parseExportFrom();
+  }
+  _base.state.tokens[exportIndex].rhsEndIndex = _base.state.tokens.length;
+} exports.parseExport = parseExport;
+
+function parseExportDefaultExpression() {
+  if (_base.isTypeScriptEnabled) {
+    if (_typescript.tsTryParseExportDefaultExpression.call(void 0, )) {
+      return;
+    }
+  }
+  if (_base.isFlowEnabled) {
+    if (_flow.flowTryParseExportDefaultExpression.call(void 0, )) {
+      return;
+    }
+  }
+  const functionStart = _base.state.start;
+  if (_tokenizer.eat.call(void 0, _types.TokenType._function)) {
+    parseFunction(functionStart, true, true);
+  } else if (_util.isContextual.call(void 0, _keywords.ContextualKeyword._async) && _tokenizer.lookaheadType.call(void 0, ) === _types.TokenType._function) {
+    // async function declaration
+    _util.eatContextual.call(void 0, _keywords.ContextualKeyword._async);
+    _tokenizer.eat.call(void 0, _types.TokenType._function);
+    parseFunction(functionStart, true, true);
+  } else if (_tokenizer.match.call(void 0, _types.TokenType._class)) {
+    parseClass(true, true);
+  } else if (_tokenizer.match.call(void 0, _types.TokenType.at)) {
+    parseDecorators();
+    parseClass(true, true);
+  } else {
+    _expression.parseMaybeAssign.call(void 0, );
+    _util.semicolon.call(void 0, );
+  }
+}
+
+function parseExportDeclaration() {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseExportDeclaration.call(void 0, );
+  } else if (_base.isFlowEnabled) {
+    _flow.flowParseExportDeclaration.call(void 0, );
+  } else {
+    parseStatement(true);
+  }
+}
+
+function isExportDefaultSpecifier() {
+  if (_base.isTypeScriptEnabled && _typescript.tsIsDeclarationStart.call(void 0, )) {
+    return false;
+  } else if (_base.isFlowEnabled && _flow.flowShouldDisallowExportDefaultSpecifier.call(void 0, )) {
+    return false;
+  }
+  if (_tokenizer.match.call(void 0, _types.TokenType.name)) {
+    return _base.state.contextualKeyword !== _keywords.ContextualKeyword._async;
+  }
+
+  if (!_tokenizer.match.call(void 0, _types.TokenType._default)) {
+    return false;
+  }
+
+  const _next = _tokenizer.nextTokenStart.call(void 0, );
+  const lookahead = _tokenizer.lookaheadTypeAndKeyword.call(void 0, );
+  const hasFrom =
+    lookahead.type === _types.TokenType.name && lookahead.contextualKeyword === _keywords.ContextualKeyword._from;
+  if (lookahead.type === _types.TokenType.comma) {
+    return true;
+  }
+  // lookahead again when `export default from` is seen
+  if (hasFrom) {
+    const nextAfterFrom = _base.input.charCodeAt(_tokenizer.nextTokenStartSince.call(void 0, _next + 4));
+    return nextAfterFrom === _charcodes.charCodes.quotationMark || nextAfterFrom === _charcodes.charCodes.apostrophe;
+  }
+  return false;
+}
+
+function parseExportSpecifiersMaybe() {
+  if (_tokenizer.eat.call(void 0, _types.TokenType.comma)) {
+    parseExportSpecifiers();
+  }
+}
+
+ function parseExportFrom() {
+  if (_util.eatContextual.call(void 0, _keywords.ContextualKeyword._from)) {
+    _expression.parseExprAtom.call(void 0, );
+    maybeParseImportAttributes();
+  }
+  _util.semicolon.call(void 0, );
+} exports.parseExportFrom = parseExportFrom;
+
+function shouldParseExportStar() {
+  if (_base.isFlowEnabled) {
+    return _flow.flowShouldParseExportStar.call(void 0, );
+  } else {
+    return _tokenizer.match.call(void 0, _types.TokenType.star);
+  }
+}
+
+function parseExportStar() {
+  if (_base.isFlowEnabled) {
+    _flow.flowParseExportStar.call(void 0, );
+  } else {
+    baseParseExportStar();
+  }
+}
+
+ function baseParseExportStar() {
+  _util.expect.call(void 0, _types.TokenType.star);
+
+  if (_util.isContextual.call(void 0, _keywords.ContextualKeyword._as)) {
+    parseExportNamespace();
+  } else {
+    parseExportFrom();
+  }
+} exports.baseParseExportStar = baseParseExportStar;
+
+function parseExportNamespace() {
+  _tokenizer.next.call(void 0, );
+  _base.state.tokens[_base.state.tokens.length - 1].type = _types.TokenType._as;
+  _expression.parseIdentifier.call(void 0, );
+  parseExportSpecifiersMaybe();
+  parseExportFrom();
+}
+
+function shouldParseExportDeclaration() {
+  return (
+    (_base.isTypeScriptEnabled && _typescript.tsIsDeclarationStart.call(void 0, )) ||
+    (_base.isFlowEnabled && _flow.flowShouldParseExportDeclaration.call(void 0, )) ||
+    _base.state.type === _types.TokenType._var ||
+    _base.state.type === _types.TokenType._const ||
+    _base.state.type === _types.TokenType._let ||
+    _base.state.type === _types.TokenType._function ||
+    _base.state.type === _types.TokenType._class ||
+    _util.isContextual.call(void 0, _keywords.ContextualKeyword._async) ||
+    _tokenizer.match.call(void 0, _types.TokenType.at)
+  );
+}
+
+// Parses a comma-separated list of module exports.
+ function parseExportSpecifiers() {
+  let first = true;
+
+  // export { x, y as z } [from '...']
+  _util.expect.call(void 0, _types.TokenType.braceL);
+
+  while (!_tokenizer.eat.call(void 0, _types.TokenType.braceR) && !_base.state.error) {
+    if (first) {
+      first = false;
+    } else {
+      _util.expect.call(void 0, _types.TokenType.comma);
+      if (_tokenizer.eat.call(void 0, _types.TokenType.braceR)) {
+        break;
+      }
+    }
+    parseExportSpecifier();
+  }
+} exports.parseExportSpecifiers = parseExportSpecifiers;
+
+function parseExportSpecifier() {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseExportSpecifier.call(void 0, );
+    return;
+  }
+  _expression.parseIdentifier.call(void 0, );
+  _base.state.tokens[_base.state.tokens.length - 1].identifierRole = _tokenizer.IdentifierRole.ExportAccess;
+  if (_util.eatContextual.call(void 0, _keywords.ContextualKeyword._as)) {
+    _expression.parseIdentifier.call(void 0, );
+  }
+}
+
+/**
+ * Starting at the `module` token in an import, determine if it was truly an
+ * import reflection token or just looks like one.
+ *
+ * Returns true for:
+ * import module foo from "foo";
+ * import module from from "foo";
+ *
+ * Returns false for:
+ * import module from "foo";
+ * import module, {bar} from "foo";
+ */
+function isImportReflection() {
+  const snapshot = _base.state.snapshot();
+  _util.expectContextual.call(void 0, _keywords.ContextualKeyword._module);
+  if (_util.eatContextual.call(void 0, _keywords.ContextualKeyword._from)) {
+    if (_util.isContextual.call(void 0, _keywords.ContextualKeyword._from)) {
+      _base.state.restoreFromSnapshot(snapshot);
+      return true;
+    } else {
+      _base.state.restoreFromSnapshot(snapshot);
+      return false;
+    }
+  } else if (_tokenizer.match.call(void 0, _types.TokenType.comma)) {
+    _base.state.restoreFromSnapshot(snapshot);
+    return false;
+  } else {
+    _base.state.restoreFromSnapshot(snapshot);
+    return true;
+  }
+}
+
+/**
+ * Eat the "module" token from the import reflection proposal.
+ * https://github.com/tc39/proposal-import-reflection
+ */
+function parseMaybeImportReflection() {
+  // isImportReflection does snapshot/restore, so only run it if we see the word
+  // "module".
+  if (_util.isContextual.call(void 0, _keywords.ContextualKeyword._module) && isImportReflection()) {
+    _tokenizer.next.call(void 0, );
+  }
+}
+
+// Parses import declaration.
+
+ function parseImport() {
+  if (_base.isTypeScriptEnabled && _tokenizer.match.call(void 0, _types.TokenType.name) && _tokenizer.lookaheadType.call(void 0, ) === _types.TokenType.eq) {
+    _typescript.tsParseImportEqualsDeclaration.call(void 0, );
+    return;
+  }
+  if (_base.isTypeScriptEnabled && _util.isContextual.call(void 0, _keywords.ContextualKeyword._type)) {
+    const lookahead = _tokenizer.lookaheadTypeAndKeyword.call(void 0, );
+    if (lookahead.type === _types.TokenType.name && lookahead.contextualKeyword !== _keywords.ContextualKeyword._from) {
+      // One of these `import type` cases:
+      // import type T = require('T');
+      // import type A from 'A';
+      _util.expectContextual.call(void 0, _keywords.ContextualKeyword._type);
+      if (_tokenizer.lookaheadType.call(void 0, ) === _types.TokenType.eq) {
+        _typescript.tsParseImportEqualsDeclaration.call(void 0, );
+        return;
+      }
+      // If this is an `import type...from` statement, then we already ate the
+      // type token, so proceed to the regular import parser.
+    } else if (lookahead.type === _types.TokenType.star || lookahead.type === _types.TokenType.braceL) {
+      // One of these `import type` cases, in which case we can eat the type token
+      // and proceed as normal:
+      // import type * as A from 'A';
+      // import type {a} from 'A';
+      _util.expectContextual.call(void 0, _keywords.ContextualKeyword._type);
+    }
+    // Otherwise, we are importing the name "type".
+  }
+
+  // import '...'
+  if (_tokenizer.match.call(void 0, _types.TokenType.string)) {
+    _expression.parseExprAtom.call(void 0, );
+  } else {
+    parseMaybeImportReflection();
+    parseImportSpecifiers();
+    _util.expectContextual.call(void 0, _keywords.ContextualKeyword._from);
+    _expression.parseExprAtom.call(void 0, );
+  }
+  maybeParseImportAttributes();
+  _util.semicolon.call(void 0, );
+} exports.parseImport = parseImport;
+
+// eslint-disable-next-line no-unused-vars
+function shouldParseDefaultImport() {
+  return _tokenizer.match.call(void 0, _types.TokenType.name);
+}
+
+function parseImportSpecifierLocal() {
+  _lval.parseImportedIdentifier.call(void 0, );
+}
+
+// Parses a comma-separated list of module imports.
+function parseImportSpecifiers() {
+  if (_base.isFlowEnabled) {
+    _flow.flowStartParseImportSpecifiers.call(void 0, );
+  }
+
+  let first = true;
+  if (shouldParseDefaultImport()) {
+    // import defaultObj, { x, y as z } from '...'
+    parseImportSpecifierLocal();
+
+    if (!_tokenizer.eat.call(void 0, _types.TokenType.comma)) return;
+  }
+
+  if (_tokenizer.match.call(void 0, _types.TokenType.star)) {
+    _tokenizer.next.call(void 0, );
+    _util.expectContextual.call(void 0, _keywords.ContextualKeyword._as);
+
+    parseImportSpecifierLocal();
+
+    return;
+  }
+
+  _util.expect.call(void 0, _types.TokenType.braceL);
+  while (!_tokenizer.eat.call(void 0, _types.TokenType.braceR) && !_base.state.error) {
+    if (first) {
+      first = false;
+    } else {
+      // Detect an attempt to deep destructure
+      if (_tokenizer.eat.call(void 0, _types.TokenType.colon)) {
+        _util.unexpected.call(void 0, 
+          "ES2015 named imports do not destructure. Use another statement for destructuring after the import.",
+        );
+      }
+
+      _util.expect.call(void 0, _types.TokenType.comma);
+      if (_tokenizer.eat.call(void 0, _types.TokenType.braceR)) {
+        break;
+      }
+    }
+
+    parseImportSpecifier();
+  }
+}
+
+function parseImportSpecifier() {
+  if (_base.isTypeScriptEnabled) {
+    _typescript.tsParseImportSpecifier.call(void 0, );
+    return;
+  }
+  if (_base.isFlowEnabled) {
+    _flow.flowParseImportSpecifier.call(void 0, );
+    return;
+  }
+  _lval.parseImportedIdentifier.call(void 0, );
+  if (_util.isContextual.call(void 0, _keywords.ContextualKeyword._as)) {
+    _base.state.tokens[_base.state.tokens.length - 1].identifierRole = _tokenizer.IdentifierRole.ImportAccess;
+    _tokenizer.next.call(void 0, );
+    _lval.parseImportedIdentifier.call(void 0, );
+  }
+}
+
+/**
+ * Parse import attributes like `with {type: "json"}`, or the legacy form
+ * `assert {type: "json"}`.
+ *
+ * Import attributes technically have their own syntax, but are always parseable
+ * as a plain JS object, so just do that for simplicity.
+ */
+function maybeParseImportAttributes() {
+  if (_tokenizer.match.call(void 0, _types.TokenType._with) || (_util.isContextual.call(void 0, _keywords.ContextualKeyword._assert) && !_util.hasPrecedingLineBreak.call(void 0, ))) {
+    _tokenizer.next.call(void 0, );
+    _expression.parseObj.call(void 0, false, false);
+  }
+}
diff --git a/node_modules/sucrase/dist/parser/traverser/util.js b/node_modules/sucrase/dist/parser/traverser/util.js
new file mode 100644
index 0000000..8ade800
--- /dev/null
+++ b/node_modules/sucrase/dist/parser/traverser/util.js
@@ -0,0 +1,104 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true});var _index = require('../tokenizer/index');
+
+var _types = require('../tokenizer/types');
+var _charcodes = require('../util/charcodes');
+var _base = require('./base');
+
+// ## Parser utilities
+
+// Tests whether parsed token is a contextual keyword.
+ function isContextual(contextualKeyword) {
+  return _base.state.contextualKeyword === contextualKeyword;
+} exports.isContextual = isContextual;
+
+ function isLookaheadContextual(contextualKeyword) {
+  const l = _index.lookaheadTypeAndKeyword.call(void 0, );
+  return l.type === _types.TokenType.name && l.contextualKeyword === contextualKeyword;
+} exports.isLookaheadContextual = isLookaheadContextual;
+
+// Consumes contextual keyword if possible.
+ function eatContextual(contextualKeyword) {
+  return _base.state.contextualKeyword === contextualKeyword && _index.eat.call(void 0, _types.TokenType.name);
+} exports.eatContextual = eatContextual;
+
+// Asserts that following token is given contextual keyword.
+ function expectContextual(contextualKeyword) {
+  if (!eatContextual(contextualKeyword)) {
+    unexpected();
+  }
+} exports.expectContextual = expectContextual;
+
+// Test whether a semicolon can be inserted at the current position.
+ function canInsertSemicolon() {
+  return _index.match.call(void 0, _types.TokenType.eof) || _index.match.call(void 0, _types.TokenType.braceR) || hasPrecedingLineBreak();
+} exports.canInsertSemicolon = canInsertSemicolon;
+
+ function hasPrecedingLineBreak() {
+  const prevToken = _base.state.tokens[_base.state.tokens.length - 1];
+  const lastTokEnd = prevToken ? prevToken.end : 0;
+  for (let i = lastTokEnd; i < _base.state.start; i++) {
+    const code = _base.input.charCodeAt(i);
+    if (
+      code === _charcodes.charCodes.lineFeed ||
+      code === _charcodes.charCodes.carriageReturn ||
+      code === 0x2028 ||
+      code === 0x2029
+    ) {
+      return true;
+    }
+  }
+  return false;
+} exports.hasPrecedingLineBreak = hasPrecedingLineBreak;
+
+ function hasFollowingLineBreak() {
+  const nextStart = _index.nextTokenStart.call(void 0, );
+  for (let i = _base.state.end; i < nextStart; i++) {
+    const code = _base.input.charCodeAt(i);
+    if (
+      code === _charcodes.charCodes.lineFeed ||
+      code === _charcodes.charCodes.carriageReturn ||
+      code === 0x2028 ||
+      code === 0x2029
+    ) {
+      return true;
+    }
+  }
+  return false;
+} exports.hasFollowingLineBreak = hasFollowingLineBreak;
+
+ function isLineTerminator() {
+  return _index.eat.call(void 0, _types.TokenType.semi) || canInsertSemicolon();
+} exports.isLineTerminator = isLineTerminator;
+
+// Consume a semicolon, or, failing that, see if we are allowed to
+// pretend that there is a semicolon at this position.
+ function semicolon() {
+  if (!isLineTerminator()) {
+    unexpected('Unexpected token, expected ";"');
+  }
+} exports.semicolon = semicolon;
+
+// Expect a token of a given type. If found, consume it, otherwise,
+// raise an unexpected token error at given pos.
+ function expect(type) {
+  const matched = _index.eat.call(void 0, type);
+  if (!matched) {
+    unexpected(`Unexpected token, expected "${_types.formatTokenType.call(void 0, type)}"`);
+  }
+} exports.expect = expect;
+
+/**
+ * Transition the parser to an error state. All code needs to be written to naturally unwind in this
+ * state, which allows us to backtrack without exceptions and without error plumbing everywhere.
+ */
+ function unexpected(message = "Unexpected token", pos = _base.state.start) {
+  if (_base.state.error) {
+    return;
+  }
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const err = new SyntaxError(message);
+  err.pos = pos;
+  _base.state.error = err;
+  _base.state.pos = _base.input.length;
+  _index.finishToken.call(void 0, _types.TokenType.eof);
+} exports.unexpected = unexpected;