TypeError: Cannot read property 'buildError' of undefined

[antoinerousseau]

Description

JS errors in gatsby-node.js#onPostBuild (and maybe in other places too) are obscure.

Steps to reproduce

• run gatsby new gatsby-test
• add this to gatsby-node.js:

exports.onPostBuild = async () => {
    const arr = []
    const arr = []
}

• run gatsby build

Expected result

SyntaxError: Identifier 'arr' has already been declared

Actual result

TypeError: Cannot read property 'buildError' of undefined

Environment

  System:
    OS: macOS 10.14.3
    CPU: (8) x64 Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
    Shell: 5.3 - /bin/zsh
  Binaries:
    Node: 11.6.0 - /usr/local/bin/node
    Yarn: 1.13.0 - /usr/local/bin/yarn
    npm: 6.8.0 - /usr/local/bin/npm
  Languages:
    Python: 2.7.15 - /usr/local/bin/python
  Browsers:
    Chrome: 72.0.3626.109
    Firefox: 65.0.1
    Safari: 12.0.3
  npmPackages:
    gatsby: ^2.1.4 => 2.1.4
    gatsby-image: ^2.0.29 => 2.0.29
    gatsby-plugin-manifest: ^2.0.17 => 2.0.17
    gatsby-plugin-offline: ^2.0.23 => 2.0.23
    gatsby-plugin-react-helmet: ^3.0.6 => 3.0.6
    gatsby-plugin-sharp: ^2.0.20 => 2.0.20
    gatsby-source-filesystem: ^2.0.20 => 2.0.20
    gatsby-transformer-sharp: ^2.1.13 => 2.1.13
  npmGlobalPackages:
    gatsby-cli: 2.4.10

[wardpeet]

You're completely right. Sadly it's an upstream bug on babel's side #8617. I've just subscribed to it and I'll try to help pinpoint the issue there.

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