FIN INIT

node_modules/sucrase/dist/esm/util/elideImportEquals.js

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+import {TokenType as tt} from "../parser/tokenizer/types";
+
+
+export default function elideImportEquals(tokens) {
+  // import
+  tokens.removeInitialToken();
+  // name
+  tokens.removeToken();
+  // =
+  tokens.removeToken();
+  // name or require
+  tokens.removeToken();
+  // Handle either `import A = require('A')` or `import A = B.C.D`.
+  if (tokens.matches1(tt.parenL)) {
+    // (
+    tokens.removeToken();
+    // path string
+    tokens.removeToken();
+    // )
+    tokens.removeToken();
+  } else {
+    while (tokens.matches1(tt.dot)) {
+      // .
+      tokens.removeToken();
+      // name
+      tokens.removeToken();
+    }
+  }
+}

node_modules/sucrase/dist/esm/util/formatTokens.js

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+import LinesAndColumns from "lines-and-columns";
+
+
+import {formatTokenType} from "../parser/tokenizer/types";
+
+export default function formatTokens(code, tokens) {
+  if (tokens.length === 0) {
+    return "";
+  }
+
+  const tokenKeys = Object.keys(tokens[0]).filter(
+    (k) => k !== "type" && k !== "value" && k !== "start" && k !== "end" && k !== "loc",
+  );
+  const typeKeys = Object.keys(tokens[0].type).filter((k) => k !== "label" && k !== "keyword");
+
+  const headings = ["Location", "Label", "Raw", ...tokenKeys, ...typeKeys];
+
+  const lines = new LinesAndColumns(code);
+  const rows = [headings, ...tokens.map(getTokenComponents)];
+  const padding = headings.map(() => 0);
+  for (const components of rows) {
+    for (let i = 0; i < components.length; i++) {
+      padding[i] = Math.max(padding[i], components[i].length);
+    }
+  }
+  return rows
+    .map((components) => components.map((component, i) => component.padEnd(padding[i])).join(" "))
+    .join("\n");
+
+  function getTokenComponents(token) {
+    const raw = code.slice(token.start, token.end);
+    return [
+      formatRange(token.start, token.end),
+      formatTokenType(token.type),
+      truncate(String(raw), 14),
+      // @ts-ignore: Intentional dynamic access by key.
+      ...tokenKeys.map((key) => formatValue(token[key], key)),
+      // @ts-ignore: Intentional dynamic access by key.
+      ...typeKeys.map((key) => formatValue(token.type[key], key)),
+    ];
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  function formatValue(value, key) {
+    if (value === true) {
+      return key;
+    } else if (value === false || value === null) {
+      return "";
+    } else {
+      return String(value);
+    }
+  }
+
+  function formatRange(start, end) {
+    return `${formatPos(start)}-${formatPos(end)}`;
+  }
+
+  function formatPos(pos) {
+    const location = lines.locationForIndex(pos);
+    if (!location) {
+      return "Unknown";
+    } else {
+      return `${location.line + 1}:${location.column + 1}`;
+    }
+  }
+}
+
+function truncate(s, length) {
+  if (s.length > length) {
+    return `${s.slice(0, length - 3)}...`;
+  } else {
+    return s;
+  }
+}

node_modules/sucrase/dist/esm/util/getClassInfo.js

@@ -0,0 +1,352 @@
+
+
+import {ContextualKeyword} from "../parser/tokenizer/keywords";
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
+
+/**
+ * Get information about the class fields for this class, given a token processor pointing to the
+ * open-brace at the start of the class.
+ */
+export default function getClassInfo(
+  rootTransformer,
+  tokens,
+  nameManager,
+  disableESTransforms,
+) {
+  const snapshot = tokens.snapshot();
+
+  const headerInfo = processClassHeader(tokens);
+
+  let constructorInitializerStatements = [];
+  const instanceInitializerNames = [];
+  const staticInitializerNames = [];
+  let constructorInsertPos = null;
+  const fields = [];
+  const rangesToRemove = [];
+
+  const classContextId = tokens.currentToken().contextId;
+  if (classContextId == null) {
+    throw new Error("Expected non-null class context ID on class open-brace.");
+  }
+
+  tokens.nextToken();
+  while (!tokens.matchesContextIdAndLabel(tt.braceR, classContextId)) {
+    if (tokens.matchesContextual(ContextualKeyword._constructor) && !tokens.currentToken().isType) {
+      ({constructorInitializerStatements, constructorInsertPos} = processConstructor(tokens));
+    } else if (tokens.matches1(tt.semi)) {
+      if (!disableESTransforms) {
+        rangesToRemove.push({start: tokens.currentIndex(), end: tokens.currentIndex() + 1});
+      }
+      tokens.nextToken();
+    } else if (tokens.currentToken().isType) {
+      tokens.nextToken();
+    } else {
+      // Either a method or a field. Skip to the identifier part.
+      const statementStartIndex = tokens.currentIndex();
+      let isStatic = false;
+      let isESPrivate = false;
+      let isDeclareOrAbstract = false;
+      while (isAccessModifier(tokens.currentToken())) {
+        if (tokens.matches1(tt._static)) {
+          isStatic = true;
+        }
+        if (tokens.matches1(tt.hash)) {
+          isESPrivate = true;
+        }
+        if (tokens.matches1(tt._declare) || tokens.matches1(tt._abstract)) {
+          isDeclareOrAbstract = true;
+        }
+        tokens.nextToken();
+      }
+      if (isStatic && tokens.matches1(tt.braceL)) {
+        // This is a static block, so don't process it in any special way.
+        skipToNextClassElement(tokens, classContextId);
+        continue;
+      }
+      if (isESPrivate) {
+        // Sucrase doesn't attempt to transpile private fields; just leave them as-is.
+        skipToNextClassElement(tokens, classContextId);
+        continue;
+      }
+      if (
+        tokens.matchesContextual(ContextualKeyword._constructor) &&
+        !tokens.currentToken().isType
+      ) {
+        ({constructorInitializerStatements, constructorInsertPos} = processConstructor(tokens));
+        continue;
+      }
+
+      const nameStartIndex = tokens.currentIndex();
+      skipFieldName(tokens);
+      if (tokens.matches1(tt.lessThan) || tokens.matches1(tt.parenL)) {
+        // This is a method, so nothing to process.
+        skipToNextClassElement(tokens, classContextId);
+        continue;
+      }
+      // There might be a type annotation that we need to skip.
+      while (tokens.currentToken().isType) {
+        tokens.nextToken();
+      }
+      if (tokens.matches1(tt.eq)) {
+        const equalsIndex = tokens.currentIndex();
+        // This is an initializer, so we need to wrap in an initializer method.
+        const valueEnd = tokens.currentToken().rhsEndIndex;
+        if (valueEnd == null) {
+          throw new Error("Expected rhsEndIndex on class field assignment.");
+        }
+        tokens.nextToken();
+        while (tokens.currentIndex() < valueEnd) {
+          rootTransformer.processToken();
+        }
+        let initializerName;
+        if (isStatic) {
+          initializerName = nameManager.claimFreeName("__initStatic");
+          staticInitializerNames.push(initializerName);
+        } else {
+          initializerName = nameManager.claimFreeName("__init");
+          instanceInitializerNames.push(initializerName);
+        }
+        // Fields start at the name, so `static x = 1;` has a field range of `x = 1;`.
+        fields.push({
+          initializerName,
+          equalsIndex,
+          start: nameStartIndex,
+          end: tokens.currentIndex(),
+        });
+      } else if (!disableESTransforms || isDeclareOrAbstract) {
+        // This is a regular field declaration, like `x;`. With the class transform enabled, we just
+        // remove the line so that no output is produced. With the class transform disabled, we
+        // usually want to preserve the declaration (but still strip types), but if the `declare`
+        // or `abstract` keyword is specified, we should remove the line to avoid initializing the
+        // value to undefined.
+        rangesToRemove.push({start: statementStartIndex, end: tokens.currentIndex()});
+      }
+    }
+  }
+
+  tokens.restoreToSnapshot(snapshot);
+  if (disableESTransforms) {
+    // With ES transforms disabled, we don't want to transform regular class
+    // field declarations, and we don't need to do any additional tricks to
+    // reference the constructor for static init, but we still need to transform
+    // TypeScript field initializers defined as constructor parameters and we
+    // still need to remove `declare` fields. For now, we run the same code
+    // path but omit any field information, as if the class had no field
+    // declarations. In the future, when we fully drop the class fields
+    // transform, we can simplify this code significantly.
+    return {
+      headerInfo,
+      constructorInitializerStatements,
+      instanceInitializerNames: [],
+      staticInitializerNames: [],
+      constructorInsertPos,
+      fields: [],
+      rangesToRemove,
+    };
+  } else {
+    return {
+      headerInfo,
+      constructorInitializerStatements,
+      instanceInitializerNames,
+      staticInitializerNames,
+      constructorInsertPos,
+      fields,
+      rangesToRemove,
+    };
+  }
+}
+
+/**
+ * Move the token processor to the next method/field in the class.
+ *
+ * To do that, we seek forward to the next start of a class name (either an open
+ * bracket or an identifier, or the closing curly brace), then seek backward to
+ * include any access modifiers.
+ */
+function skipToNextClassElement(tokens, classContextId) {
+  tokens.nextToken();
+  while (tokens.currentToken().contextId !== classContextId) {
+    tokens.nextToken();
+  }
+  while (isAccessModifier(tokens.tokenAtRelativeIndex(-1))) {
+    tokens.previousToken();
+  }
+}
+
+function processClassHeader(tokens) {
+  const classToken = tokens.currentToken();
+  const contextId = classToken.contextId;
+  if (contextId == null) {
+    throw new Error("Expected context ID on class token.");
+  }
+  const isExpression = classToken.isExpression;
+  if (isExpression == null) {
+    throw new Error("Expected isExpression on class token.");
+  }
+  let className = null;
+  let hasSuperclass = false;
+  tokens.nextToken();
+  if (tokens.matches1(tt.name)) {
+    className = tokens.identifierName();
+  }
+  while (!tokens.matchesContextIdAndLabel(tt.braceL, contextId)) {
+    // If this has a superclass, there will always be an `extends` token. If it doesn't have a
+    // superclass, only type parameters and `implements` clauses can show up here, all of which
+    // consist only of type tokens. A declaration like `class A<B extends C> {` should *not* count
+    // as having a superclass.
+    if (tokens.matches1(tt._extends) && !tokens.currentToken().isType) {
+      hasSuperclass = true;
+    }
+    tokens.nextToken();
+  }
+  return {isExpression, className, hasSuperclass};
+}
+
+/**
+ * Extract useful information out of a constructor, starting at the "constructor" name.
+ */
+function processConstructor(tokens)
+
+
+ {
+  const constructorInitializerStatements = [];
+
+  tokens.nextToken();
+  const constructorContextId = tokens.currentToken().contextId;
+  if (constructorContextId == null) {
+    throw new Error("Expected context ID on open-paren starting constructor params.");
+  }
+  // Advance through parameters looking for access modifiers.
+  while (!tokens.matchesContextIdAndLabel(tt.parenR, constructorContextId)) {
+    if (tokens.currentToken().contextId === constructorContextId) {
+      // Current token is an open paren or comma just before a param, so check
+      // that param for access modifiers.
+      tokens.nextToken();
+      if (isAccessModifier(tokens.currentToken())) {
+        tokens.nextToken();
+        while (isAccessModifier(tokens.currentToken())) {
+          tokens.nextToken();
+        }
+        const token = tokens.currentToken();
+        if (token.type !== tt.name) {
+          throw new Error("Expected identifier after access modifiers in constructor arg.");
+        }
+        const name = tokens.identifierNameForToken(token);
+        constructorInitializerStatements.push(`this.${name} = ${name}`);
+      }
+    } else {
+      tokens.nextToken();
+    }
+  }
+  // )
+  tokens.nextToken();
+  // Constructor type annotations are invalid, but skip them anyway since
+  // they're easy to skip.
+  while (tokens.currentToken().isType) {
+    tokens.nextToken();
+  }
+  let constructorInsertPos = tokens.currentIndex();
+
+  // Advance through body looking for a super call.
+  let foundSuperCall = false;
+  while (!tokens.matchesContextIdAndLabel(tt.braceR, constructorContextId)) {
+    if (!foundSuperCall && tokens.matches2(tt._super, tt.parenL)) {
+      tokens.nextToken();
+      const superCallContextId = tokens.currentToken().contextId;
+      if (superCallContextId == null) {
+        throw new Error("Expected a context ID on the super call");
+      }
+      while (!tokens.matchesContextIdAndLabel(tt.parenR, superCallContextId)) {
+        tokens.nextToken();
+      }
+      constructorInsertPos = tokens.currentIndex();
+      foundSuperCall = true;
+    }
+    tokens.nextToken();
+  }
+  // }
+  tokens.nextToken();
+
+  return {constructorInitializerStatements, constructorInsertPos};
+}
+
+/**
+ * Determine if this is any token that can go before the name in a method/field.
+ */
+function isAccessModifier(token) {
+  return [
+    tt._async,
+    tt._get,
+    tt._set,
+    tt.plus,
+    tt.minus,
+    tt._readonly,
+    tt._static,
+    tt._public,
+    tt._private,
+    tt._protected,
+    tt._override,
+    tt._abstract,
+    tt.star,
+    tt._declare,
+    tt.hash,
+  ].includes(token.type);
+}
+
+/**
+ * The next token or set of tokens is either an identifier or an expression in square brackets, for
+ * a method or field name.
+ */
+function skipFieldName(tokens) {
+  if (tokens.matches1(tt.bracketL)) {
+    const startToken = tokens.currentToken();
+    const classContextId = startToken.contextId;
+    if (classContextId == null) {
+      throw new Error("Expected class context ID on computed name open bracket.");
+    }
+    while (!tokens.matchesContextIdAndLabel(tt.bracketR, classContextId)) {
+      tokens.nextToken();
+    }
+    tokens.nextToken();
+  } else {
+    tokens.nextToken();
+  }
+}

node_modules/sucrase/dist/esm/util/getDeclarationInfo.js

@@ -0,0 +1,40 @@
+import {isTopLevelDeclaration} from "../parser/tokenizer";
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+
+
+
+
+
+
+export const EMPTY_DECLARATION_INFO = {
+  typeDeclarations: new Set(),
+  valueDeclarations: new Set(),
+};
+
+/**
+ * Get all top-level identifiers that should be preserved when exported in TypeScript.
+ *
+ * Examples:
+ * - If an identifier is declared as `const x`, then `export {x}` should be preserved.
+ * - If it's declared as `type x`, then `export {x}` should be removed.
+ * - If it's declared as both `const x` and `type x`, then the export should be preserved.
+ * - Classes and enums should be preserved (even though they also introduce types).
+ * - Imported identifiers should be preserved since we don't have enough information to
+ *   rule them out. --isolatedModules disallows re-exports, which catches errors here.
+ */
+export default function getDeclarationInfo(tokens) {
+  const typeDeclarations = new Set();
+  const valueDeclarations = new Set();
+  for (let i = 0; i < tokens.tokens.length; i++) {
+    const token = tokens.tokens[i];
+    if (token.type === tt.name && isTopLevelDeclaration(token)) {
+      if (token.isType) {
+        typeDeclarations.add(tokens.identifierNameForToken(token));
+      } else {
+        valueDeclarations.add(tokens.identifierNameForToken(token));
+      }
+    }
+  }
+  return {typeDeclarations, valueDeclarations};
+}

node_modules/sucrase/dist/esm/util/getIdentifierNames.js

@@ -0,0 +1,15 @@
+
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+/**
+ * Get all identifier names in the code, in order, including duplicates.
+ */
+export default function getIdentifierNames(code, tokens) {
+  const names = [];
+  for (const token of tokens) {
+    if (token.type === tt.name) {
+      names.push(code.slice(token.start, token.end));
+    }
+  }
+  return names;
+}

node_modules/sucrase/dist/esm/util/getImportExportSpecifierInfo.js

@@ -0,0 +1,92 @@
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+
+ 
+
+
+
+
+
+
+
+
+
+
+
+
+
+/**
+ * Determine information about this named import or named export specifier.
+ *
+ * This syntax is the `a` from statements like these:
+ * import {A} from "./foo";
+ * export {A};
+ * export {A} from "./foo";
+ *
+ * As it turns out, we can exactly characterize the syntax meaning by simply
+ * counting the number of tokens, which can be from 1 to 4:
+ * {A}
+ * {type A}
+ * {A as B}
+ * {type A as B}
+ *
+ * In the type case, we never actually need the names in practice, so don't get
+ * them.
+ *
+ * TODO: There's some redundancy with the type detection here and the isType
+ * flag that's already present on tokens in TS mode. This function could
+ * potentially be simplified and/or pushed to the call sites to avoid the object
+ * allocation.
+ */
+export default function getImportExportSpecifierInfo(
+  tokens,
+  index = tokens.currentIndex(),
+) {
+  let endIndex = index + 1;
+  if (isSpecifierEnd(tokens, endIndex)) {
+    // import {A}
+    const name = tokens.identifierNameAtIndex(index);
+    return {
+      isType: false,
+      leftName: name,
+      rightName: name,
+      endIndex,
+    };
+  }
+  endIndex++;
+  if (isSpecifierEnd(tokens, endIndex)) {
+    // import {type A}
+    return {
+      isType: true,
+      leftName: null,
+      rightName: null,
+      endIndex,
+    };
+  }
+  endIndex++;
+  if (isSpecifierEnd(tokens, endIndex)) {
+    // import {A as B}
+    return {
+      isType: false,
+      leftName: tokens.identifierNameAtIndex(index),
+      rightName: tokens.identifierNameAtIndex(index + 2),
+      endIndex,
+    };
+  }
+  endIndex++;
+  if (isSpecifierEnd(tokens, endIndex)) {
+    // import {type A as B}
+    return {
+      isType: true,
+      leftName: null,
+      rightName: null,
+      endIndex,
+    };
+  }
+  throw new Error(`Unexpected import/export specifier at ${index}`);
+}
+
+function isSpecifierEnd(tokens, index) {
+  const token = tokens.tokens[index];
+  return token.type === tt.braceR || token.type === tt.comma;
+}

node_modules/sucrase/dist/esm/util/getJSXPragmaInfo.js

@@ -0,0 +1,22 @@
+
+
+
+
+
+
+
+
+
+export default function getJSXPragmaInfo(options) {
+  const [base, suffix] = splitPragma(options.jsxPragma || "React.createElement");
+  const [fragmentBase, fragmentSuffix] = splitPragma(options.jsxFragmentPragma || "React.Fragment");
+  return {base, suffix, fragmentBase, fragmentSuffix};
+}
+
+function splitPragma(pragma) {
+  let dotIndex = pragma.indexOf(".");
+  if (dotIndex === -1) {
+    dotIndex = pragma.length;
+  }
+  return [pragma.slice(0, dotIndex), pragma.slice(dotIndex)];
+}

node_modules/sucrase/dist/esm/util/getNonTypeIdentifiers.js

@@ -0,0 +1,43 @@
+
+import {IdentifierRole} from "../parser/tokenizer";
+import {TokenType, TokenType as tt} from "../parser/tokenizer/types";
+
+import {startsWithLowerCase} from "../transformers/JSXTransformer";
+import getJSXPragmaInfo from "./getJSXPragmaInfo";
+
+export function getNonTypeIdentifiers(tokens, options) {
+  const jsxPragmaInfo = getJSXPragmaInfo(options);
+  const nonTypeIdentifiers = new Set();
+  for (let i = 0; i < tokens.tokens.length; i++) {
+    const token = tokens.tokens[i];
+    if (
+      token.type === tt.name &&
+      !token.isType &&
+      (token.identifierRole === IdentifierRole.Access ||
+        token.identifierRole === IdentifierRole.ObjectShorthand ||
+        token.identifierRole === IdentifierRole.ExportAccess) &&
+      !token.shadowsGlobal
+    ) {
+      nonTypeIdentifiers.add(tokens.identifierNameForToken(token));
+    }
+    if (token.type === tt.jsxTagStart) {
+      nonTypeIdentifiers.add(jsxPragmaInfo.base);
+    }
+    if (
+      token.type === tt.jsxTagStart &&
+      i + 1 < tokens.tokens.length &&
+      tokens.tokens[i + 1].type === tt.jsxTagEnd
+    ) {
+      nonTypeIdentifiers.add(jsxPragmaInfo.base);
+      nonTypeIdentifiers.add(jsxPragmaInfo.fragmentBase);
+    }
+    if (token.type === tt.jsxName && token.identifierRole === IdentifierRole.Access) {
+      const identifierName = tokens.identifierNameForToken(token);
+      // Lower-case single-component tag names like "div" don't count.
+      if (!startsWithLowerCase(identifierName) || tokens.tokens[i + 1].type === TokenType.dot) {
+        nonTypeIdentifiers.add(tokens.identifierNameForToken(token));
+      }
+    }
+  }
+  return nonTypeIdentifiers;
+}

node_modules/sucrase/dist/esm/util/getTSImportedNames.js

@@ -0,0 +1,84 @@
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+import getImportExportSpecifierInfo from "./getImportExportSpecifierInfo";
+
+/**
+ * Special case code to scan for imported names in ESM TypeScript. We need to do this so we can
+ * properly get globals so we can compute shadowed globals.
+ *
+ * This is similar to logic in CJSImportProcessor, but trimmed down to avoid logic with CJS
+ * replacement and flow type imports.
+ */
+export default function getTSImportedNames(tokens) {
+  const importedNames = new Set();
+  for (let i = 0; i < tokens.tokens.length; i++) {
+    if (
+      tokens.matches1AtIndex(i, tt._import) &&
+      !tokens.matches3AtIndex(i, tt._import, tt.name, tt.eq)
+    ) {
+      collectNamesForImport(tokens, i, importedNames);
+    }
+  }
+  return importedNames;
+}
+
+function collectNamesForImport(
+  tokens,
+  index,
+  importedNames,
+) {
+  index++;
+
+  if (tokens.matches1AtIndex(index, tt.parenL)) {
+    // Dynamic import, so nothing to do
+    return;
+  }
+
+  if (tokens.matches1AtIndex(index, tt.name)) {
+    importedNames.add(tokens.identifierNameAtIndex(index));
+    index++;
+    if (tokens.matches1AtIndex(index, tt.comma)) {
+      index++;
+    }
+  }
+
+  if (tokens.matches1AtIndex(index, tt.star)) {
+    // * as
+    index += 2;
+    importedNames.add(tokens.identifierNameAtIndex(index));
+    index++;
+  }
+
+  if (tokens.matches1AtIndex(index, tt.braceL)) {
+    index++;
+    collectNamesForNamedImport(tokens, index, importedNames);
+  }
+}
+
+function collectNamesForNamedImport(
+  tokens,
+  index,
+  importedNames,
+) {
+  while (true) {
+    if (tokens.matches1AtIndex(index, tt.braceR)) {
+      return;
+    }
+
+    const specifierInfo = getImportExportSpecifierInfo(tokens, index);
+    index = specifierInfo.endIndex;
+    if (!specifierInfo.isType) {
+      importedNames.add(specifierInfo.rightName);
+    }
+
+    if (tokens.matches2AtIndex(index, tt.comma, tt.braceR)) {
+      return;
+    } else if (tokens.matches1AtIndex(index, tt.braceR)) {
+      return;
+    } else if (tokens.matches1AtIndex(index, tt.comma)) {
+      index++;
+    } else {
+      throw new Error(`Unexpected token: ${JSON.stringify(tokens.tokens[index])}`);
+    }
+  }
+}

node_modules/sucrase/dist/esm/util/isAsyncOperation.js

@@ -0,0 +1,38 @@
+import {ContextualKeyword} from "../parser/tokenizer/keywords";
+
+
+/**
+ * Determine whether this optional chain or nullish coalescing operation has any await statements in
+ * it. If so, we'll need to transpile to an async operation.
+ *
+ * We compute this by walking the length of the operation and returning true if we see an await
+ * keyword used as a real await (rather than an object key or property access). Nested optional
+ * chain/nullish operations need to be tracked but don't silence await, but a nested async function
+ * (or any other nested scope) will make the await not count.
+ */
+export default function isAsyncOperation(tokens) {
+  let index = tokens.currentIndex();
+  let depth = 0;
+  const startToken = tokens.currentToken();
+  do {
+    const token = tokens.tokens[index];
+    if (token.isOptionalChainStart) {
+      depth++;
+    }
+    if (token.isOptionalChainEnd) {
+      depth--;
+    }
+    depth += token.numNullishCoalesceStarts;
+    depth -= token.numNullishCoalesceEnds;
+
+    if (
+      token.contextualKeyword === ContextualKeyword._await &&
+      token.identifierRole == null &&
+      token.scopeDepth === startToken.scopeDepth
+    ) {
+      return true;
+    }
+    index += 1;
+  } while (depth > 0 && index < tokens.tokens.length);
+  return false;
+}

node_modules/sucrase/dist/esm/util/isExportFrom.js

@@ -0,0 +1,18 @@
+import {ContextualKeyword} from "../parser/tokenizer/keywords";
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+
+/**
+ * Starting at `export {`, look ahead and return `true` if this is an
+ * `export {...} from` statement and `false` if this is a plain multi-export.
+ */
+export default function isExportFrom(tokens) {
+  let closeBraceIndex = tokens.currentIndex();
+  while (!tokens.matches1AtIndex(closeBraceIndex, tt.braceR)) {
+    closeBraceIndex++;
+  }
+  return (
+    tokens.matchesContextualAtIndex(closeBraceIndex + 1, ContextualKeyword._from) &&
+    tokens.matches1AtIndex(closeBraceIndex + 2, tt.string)
+  );
+}

node_modules/sucrase/dist/esm/util/isIdentifier.js

@@ -0,0 +1,81 @@
+import {IS_IDENTIFIER_CHAR, IS_IDENTIFIER_START} from "../parser/util/identifier";
+
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar
+// Hard-code a list of reserved words rather than trying to use keywords or contextual keywords
+// from the parser, since currently there are various exceptions, like `package` being reserved
+// but unused and various contextual keywords being reserved. Note that we assume that all code
+// compiled by Sucrase is in a module, so strict mode words and await are all considered reserved
+// here.
+const RESERVED_WORDS = new Set([
+  // Reserved keywords as of ECMAScript 2015
+  "break",
+  "case",
+  "catch",
+  "class",
+  "const",
+  "continue",
+  "debugger",
+  "default",
+  "delete",
+  "do",
+  "else",
+  "export",
+  "extends",
+  "finally",
+  "for",
+  "function",
+  "if",
+  "import",
+  "in",
+  "instanceof",
+  "new",
+  "return",
+  "super",
+  "switch",
+  "this",
+  "throw",
+  "try",
+  "typeof",
+  "var",
+  "void",
+  "while",
+  "with",
+  "yield",
+  // Future reserved keywords
+  "enum",
+  "implements",
+  "interface",
+  "let",
+  "package",
+  "private",
+  "protected",
+  "public",
+  "static",
+  "await",
+  // Literals that cannot be used as identifiers
+  "false",
+  "null",
+  "true",
+]);
+
+/**
+ * Determine if the given name is a legal variable name.
+ *
+ * This is needed when transforming TypeScript enums; if an enum key is a valid
+ * variable name, it might be referenced later in the enum, so we need to
+ * declare a variable.
+ */
+export default function isIdentifier(name) {
+  if (name.length === 0) {
+    return false;
+  }
+  if (!IS_IDENTIFIER_START[name.charCodeAt(0)]) {
+    return false;
+  }
+  for (let i = 1; i < name.length; i++) {
+    if (!IS_IDENTIFIER_CHAR[name.charCodeAt(i)]) {
+      return false;
+    }
+  }
+  return !RESERVED_WORDS.has(name);
+}

node_modules/sucrase/dist/esm/util/removeMaybeImportAttributes.js

@@ -0,0 +1,22 @@
+import {ContextualKeyword} from "../parser/tokenizer/keywords";
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+
+/**
+ * Starting at a potential `with` or (legacy) `assert` token, remove the import
+ * attributes if they exist.
+ */
+export function removeMaybeImportAttributes(tokens) {
+  if (
+    tokens.matches2(tt._with, tt.braceL) ||
+    (tokens.matches2(tt.name, tt.braceL) && tokens.matchesContextual(ContextualKeyword._assert))
+  ) {
+    // assert
+    tokens.removeToken();
+    // {
+    tokens.removeToken();
+    tokens.removeBalancedCode();
+    // }
+    tokens.removeToken();
+  }
+}

node_modules/sucrase/dist/esm/util/shouldElideDefaultExport.js

@@ -0,0 +1,38 @@
+import {TokenType as tt} from "../parser/tokenizer/types";
+
+
+
+/**
+ * Common method sharing code between CJS and ESM cases, since they're the same here.
+ */
+export default function shouldElideDefaultExport(
+  isTypeScriptTransformEnabled,
+  keepUnusedImports,
+  tokens,
+  declarationInfo,
+) {
+  if (!isTypeScriptTransformEnabled || keepUnusedImports) {
+    return false;
+  }
+  const exportToken = tokens.currentToken();
+  if (exportToken.rhsEndIndex == null) {
+    throw new Error("Expected non-null rhsEndIndex on export token.");
+  }
+  // The export must be of the form `export default a` or `export default a;`.
+  const numTokens = exportToken.rhsEndIndex - tokens.currentIndex();
+  if (
+    numTokens !== 3 &&
+    !(numTokens === 4 && tokens.matches1AtIndex(exportToken.rhsEndIndex - 1, tt.semi))
+  ) {
+    return false;
+  }
+  const identifierToken = tokens.tokenAtRelativeIndex(2);
+  if (identifierToken.type !== tt.name) {
+    return false;
+  }
+  const exportedName = tokens.identifierNameForToken(identifierToken);
+  return (
+    declarationInfo.typeDeclarations.has(exportedName) &&
+    !declarationInfo.valueDeclarations.has(exportedName)
+  );
+}