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babel-preset-typescript failed to parse optional async method #10525

dreamsinspace opened this issue Oct 3, 2019 · 1 comment


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commented Oct 3, 2019

Bug Report

Current Behavior
Babel throws Unexpected token, expected "(" when encounters this piece of code:

class A extends B {
  async method?(val: string): Promise<void>;

Expected behavior/code
This code should be parsed successfully

Babel Configuration (.babelrc, package.json, cli command)

module.exports = {
  presets: [
        targets: {
          node: 'current',
  ignore: ['node_modules'],


  • Babel version(s): 7.4.0
  • Node/npm version: 10.16.3
  • OS: Windows 10
  • Monorepo: no
  • How you are using Babel: cli

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commented Oct 3, 2019

Hey @dreamsinspace! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite."

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