Function processTopLevelAwait

lib/internal/repl/await.js:154–258

(src)

}

function processTopLevelAwait(src) {
  const wrapPrefix = '(async () => { ';
  const wrapped = `${wrapPrefix}${src} })()`;
  const wrappedArray = StringPrototypeSplit(wrapped, '');
  let root;
  try {
    root = parser.parse(wrapped, { ecmaVersion: 'latest' });
  } catch (e) {
    if (StringPrototypeStartsWith(e.message, 'Unterminated '))
      throw new Recoverable(e);
    // If the parse error is before the first "await", then use the execution
    // error. Otherwise we must emit this parse error, making it look like a
    // proper syntax error.
    const awaitPos = StringPrototypeIndexOf(src, 'await');
    const errPos = e.pos - wrapPrefix.length;
    if (awaitPos > errPos)
      return null;
    // Convert keyword parse errors on await into their original errors when
    // possible.
    if (errPos === awaitPos + 6 &&
        StringPrototypeIncludes(e.message, 'Expecting Unicode escape sequence'))
      return null;
    if (errPos === awaitPos + 7 &&
        StringPrototypeIncludes(e.message, 'Unexpected token'))
      return null;
    const line = e.loc.line;
    const column = line === 1 ? e.loc.column - wrapPrefix.length : e.loc.column;
    let message = '\n' + StringPrototypeSplit(src, '\n', line)[line - 1] + '\n' +
        StringPrototypeRepeat(' ', column) +
        '^\n\n' + RegExpPrototypeSymbolReplace(/ \([^)]+\)/, e.message, '');
    // V8 unexpected token errors include the token string.
    if (StringPrototypeEndsWith(message, 'Unexpected token'))
      message += " '" +
        // Wrapper end may cause acorn to report error position after the source
        (src[e.pos - wrapPrefix.length] ?? src[src.length - 1]) +
        "'";
    // eslint-disable-next-line no-restricted-syntax
    throw new SyntaxError(message);
  }
  const body = root.body[0].expression.callee.body;
  const state = {
    body,
    ancestors: [],
    hoistedDeclarationStatements: [],
    replace(from, to, str) {
      for (let i = from; i < to; i++) {
        wrappedArray[i] = '';
      }
      if (from === to) str += wrappedArray[from];
      wrappedArray[from] = str;
    },
    prepend(node, str) {
      wrappedArray[node.start] = str + wrappedArray[node.start];
    },
    append(node, str) {
      wrappedArray[node.end - 1] += str;
    },
    containsAwait: false,