inital

node_modules/sucrase/dist/esm/parser/traverser/base.js

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+import State from "../tokenizer/state";
+import {charCodes} from "../util/charcodes";
+
+export let isJSXEnabled;
+export let isTypeScriptEnabled;
+export let isFlowEnabled;
+export let state;
+export let input;
+export let nextContextId;
+
+export function getNextContextId() {
+  return nextContextId++;
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function augmentError(error) {
+  if ("pos" in error) {
+    const loc = locationForIndex(error.pos);
+    error.message += ` (${loc.line}:${loc.column})`;
+    error.loc = loc;
+  }
+  return error;
+}
+
+export class Loc {
+  
+  
+  constructor(line, column) {
+    this.line = line;
+    this.column = column;
+  }
+}
+
+export function locationForIndex(pos) {
+  let line = 1;
+  let column = 1;
+  for (let i = 0; i < pos; i++) {
+    if (input.charCodeAt(i) === charCodes.lineFeed) {
+      line++;
+      column = 1;
+    } else {
+      column++;
+    }
+  }
+  return new Loc(line, column);
+}
+
+export function initParser(
+  inputCode,
+  isJSXEnabledArg,
+  isTypeScriptEnabledArg,
+  isFlowEnabledArg,
+) {
+  input = inputCode;
+  state = new State();
+  nextContextId = 1;
+  isJSXEnabled = isJSXEnabledArg;
+  isTypeScriptEnabled = isTypeScriptEnabledArg;
+  isFlowEnabled = isFlowEnabledArg;
+}

node_modules/sucrase/dist/esm/parser/traverser/index.js

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+
+import {nextToken, skipLineComment} from "../tokenizer/index";
+import {charCodes} from "../util/charcodes";
+import {input, state} from "./base";
+import {parseTopLevel} from "./statement";
+
+export function parseFile() {
+  // If enabled, skip leading hashbang line.
+  if (
+    state.pos === 0 &&
+    input.charCodeAt(0) === charCodes.numberSign &&
+    input.charCodeAt(1) === charCodes.exclamationMark
+  ) {
+    skipLineComment(2);
+  }
+  nextToken();
+  return parseTopLevel();
+}

node_modules/sucrase/dist/esm/parser/traverser/lval.js

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+import {flowParseAssignableListItemTypes} from "../plugins/flow";
+import {tsParseAssignableListItemTypes, tsParseModifiers} from "../plugins/typescript";
+import {
+  eat,
+  IdentifierRole,
+  match,
+  next,
+  popTypeContext,
+  pushTypeContext,
+} from "../tokenizer/index";
+import {ContextualKeyword} from "../tokenizer/keywords";
+import {TokenType, TokenType as tt} from "../tokenizer/types";
+import {isFlowEnabled, isTypeScriptEnabled, state} from "./base";
+import {parseIdentifier, parseMaybeAssign, parseObj} from "./expression";
+import {expect, unexpected} from "./util";
+
+export function parseSpread() {
+  next();
+  parseMaybeAssign(false);
+}
+
+export function parseRest(isBlockScope) {
+  next();
+  parseBindingAtom(isBlockScope);
+}
+
+export function parseBindingIdentifier(isBlockScope) {
+  parseIdentifier();
+  markPriorBindingIdentifier(isBlockScope);
+}
+
+export function parseImportedIdentifier() {
+  parseIdentifier();
+  state.tokens[state.tokens.length - 1].identifierRole = IdentifierRole.ImportDeclaration;
+}
+
+export function markPriorBindingIdentifier(isBlockScope) {
+  let identifierRole;
+  if (state.scopeDepth === 0) {
+    identifierRole = IdentifierRole.TopLevelDeclaration;
+  } else if (isBlockScope) {
+    identifierRole = IdentifierRole.BlockScopedDeclaration;
+  } else {
+    identifierRole = IdentifierRole.FunctionScopedDeclaration;
+  }
+  state.tokens[state.tokens.length - 1].identifierRole = identifierRole;
+}
+
+// Parses lvalue (assignable) atom.
+export function parseBindingAtom(isBlockScope) {
+  switch (state.type) {
+    case tt._this: {
+      // In TypeScript, "this" may be the name of a parameter, so allow it.
+      const oldIsType = pushTypeContext(0);
+      next();
+      popTypeContext(oldIsType);
+      return;
+    }
+
+    case tt._yield:
+    case tt.name: {
+      state.type = tt.name;
+      parseBindingIdentifier(isBlockScope);
+      return;
+    }
+
+    case tt.bracketL: {
+      next();
+      parseBindingList(tt.bracketR, isBlockScope, true /* allowEmpty */);
+      return;
+    }
+
+    case tt.braceL:
+      parseObj(true, isBlockScope);
+      return;
+
+    default:
+      unexpected();
+  }
+}
+
+export function parseBindingList(
+  close,
+  isBlockScope,
+  allowEmpty = false,
+  allowModifiers = false,
+  contextId = 0,
+) {
+  let first = true;
+
+  let hasRemovedComma = false;
+  const firstItemTokenIndex = state.tokens.length;
+
+  while (!eat(close) && !state.error) {
+    if (first) {
+      first = false;
+    } else {
+      expect(tt.comma);
+      state.tokens[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 && state.tokens[firstItemTokenIndex].isType) {
+        state.tokens[state.tokens.length - 1].isType = true;
+        hasRemovedComma = true;
+      }
+    }
+    if (allowEmpty && match(tt.comma)) {
+      // Empty item; nothing further to parse for this item.
+    } else if (eat(close)) {
+      break;
+    } else if (match(tt.ellipsis)) {
+      parseRest(isBlockScope);
+      parseAssignableListItemTypes();
+      // Support rest element trailing commas allowed by TypeScript <2.9.
+      eat(TokenType.comma);
+      expect(close);
+      break;
+    } else {
+      parseAssignableListItem(allowModifiers, isBlockScope);
+    }
+  }
+}
+
+function parseAssignableListItem(allowModifiers, isBlockScope) {
+  if (allowModifiers) {
+    tsParseModifiers([
+      ContextualKeyword._public,
+      ContextualKeyword._protected,
+      ContextualKeyword._private,
+      ContextualKeyword._readonly,
+      ContextualKeyword._override,
+    ]);
+  }
+
+  parseMaybeDefault(isBlockScope);
+  parseAssignableListItemTypes();
+  parseMaybeDefault(isBlockScope, true /* leftAlreadyParsed */);
+}
+
+function parseAssignableListItemTypes() {
+  if (isFlowEnabled) {
+    flowParseAssignableListItemTypes();
+  } else if (isTypeScriptEnabled) {
+    tsParseAssignableListItemTypes();
+  }
+}
+
+// Parses assignment pattern around given atom if possible.
+export function parseMaybeDefault(isBlockScope, leftAlreadyParsed = false) {
+  if (!leftAlreadyParsed) {
+    parseBindingAtom(isBlockScope);
+  }
+  if (!eat(tt.eq)) {
+    return;
+  }
+  const eqIndex = state.tokens.length - 1;
+  parseMaybeAssign();
+  state.tokens[eqIndex].rhsEndIndex = state.tokens.length;
+}

node_modules/sucrase/dist/esm/parser/traverser/util.js

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+import {eat, finishToken, lookaheadTypeAndKeyword, match, nextTokenStart} from "../tokenizer/index";
+
+import {formatTokenType, TokenType as tt} from "../tokenizer/types";
+import {charCodes} from "../util/charcodes";
+import {input, state} from "./base";
+
+// ## Parser utilities
+
+// Tests whether parsed token is a contextual keyword.
+export function isContextual(contextualKeyword) {
+  return state.contextualKeyword === contextualKeyword;
+}
+
+export function isLookaheadContextual(contextualKeyword) {
+  const l = lookaheadTypeAndKeyword();
+  return l.type === tt.name && l.contextualKeyword === contextualKeyword;
+}
+
+// Consumes contextual keyword if possible.
+export function eatContextual(contextualKeyword) {
+  return state.contextualKeyword === contextualKeyword && eat(tt.name);
+}
+
+// Asserts that following token is given contextual keyword.
+export function expectContextual(contextualKeyword) {
+  if (!eatContextual(contextualKeyword)) {
+    unexpected();
+  }
+}
+
+// Test whether a semicolon can be inserted at the current position.
+export function canInsertSemicolon() {
+  return match(tt.eof) || match(tt.braceR) || hasPrecedingLineBreak();
+}
+
+export function hasPrecedingLineBreak() {
+  const prevToken = state.tokens[state.tokens.length - 1];
+  const lastTokEnd = prevToken ? prevToken.end : 0;
+  for (let i = lastTokEnd; i < state.start; i++) {
+    const code = input.charCodeAt(i);
+    if (
+      code === charCodes.lineFeed ||
+      code === charCodes.carriageReturn ||
+      code === 0x2028 ||
+      code === 0x2029
+    ) {
+      return true;
+    }
+  }
+  return false;
+}
+
+export function hasFollowingLineBreak() {
+  const nextStart = nextTokenStart();
+  for (let i = state.end; i < nextStart; i++) {
+    const code = input.charCodeAt(i);
+    if (
+      code === charCodes.lineFeed ||
+      code === charCodes.carriageReturn ||
+      code === 0x2028 ||
+      code === 0x2029
+    ) {
+      return true;
+    }
+  }
+  return false;
+}
+
+export function isLineTerminator() {
+  return eat(tt.semi) || canInsertSemicolon();
+}
+
+// Consume a semicolon, or, failing that, see if we are allowed to
+// pretend that there is a semicolon at this position.
+export function semicolon() {
+  if (!isLineTerminator()) {
+    unexpected('Unexpected token, expected ";"');
+  }
+}
+
+// Expect a token of a given type. If found, consume it, otherwise,
+// raise an unexpected token error at given pos.
+export function expect(type) {
+  const matched = eat(type);
+  if (!matched) {
+    unexpected(`Unexpected token, expected "${formatTokenType(type)}"`);
+  }
+}
+
+/**
+ * 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.
+ */
+export function unexpected(message = "Unexpected token", pos = state.start) {
+  if (state.error) {
+    return;
+  }
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const err = new SyntaxError(message);
+  err.pos = pos;
+  state.error = err;
+  state.pos = input.length;
+  finishToken(tt.eof);
+}