gatsby starter failed Building development bundle

[def-not-ys]

Description

I am using this gatsby-ghost-starter. I successfully installed the app, and ran yarn to installed all dependencies. But when I ran gatsby develop I kept getting this error:

 ERROR #98124  WEBPACK

Generating development JavaScript bundle failed

Can't resolve 'core-js/modules/es.array.flat' in <file path>

If you're trying to use a package make sure that 'core-js/modules/es.array.flat' is installed. If you're trying to use a local file make sure that the path is correct.

File: .cache\error-overlay-handler.js


 ERROR #98124  WEBPACK

Generating development JavaScript bundle failed

Can't resolve 'core-js/modules/es.array.unscopables.flat' in <file path>

If you're trying to use a package make sure that 'core-js/modules/es.array.unscopables.flat' is installed. If you're trying to use a local file make sure that the path is correct.

File: .cache\error-overlay-handler.js

failed Building development bundle - 3.868s

I tried adding the react tool tip mentioned in this post #25453 and still getting the same error.

Steps to reproduce

npm install -g gatsby-cli

gatsby new gatsby-starter-ghost https://github.com/TryGhost/gatsby-starter-ghost

```bash
yarn

```bash
gatsby develop

```bash
ERROR #98124 WEBPACK (error message above)

### Expected result

Should develop successfully 

### Actual result

not able to complete building development bundle

```bash 
failed Building development bundle

Environment

System:
    OS: Windows 10 10.0.18362
    CPU: (8) x64 Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz  
  Binaries:
    Node: 12.16.3 - C:\Program Files\nodejs\node.EXE       
    Yarn: 1.22.4 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 6.14.4 - C:\Program Files\nodejs\npm.CMD
  Languages:
    Python: 3.8.2
  Browsers:
    Edge: 44.18362.449.0
  npmPackages:
    gatsby: 2.23.20 => 2.23.20
    gatsby-awesome-pagination: 0.3.6 => 0.3.6
    gatsby-image: 2.4.12 => 2.4.12
    gatsby-plugin-advanced-sitemap: 1.5.5 => 1.5.5
    gatsby-plugin-catch-links: 2.3.10 => 2.3.10
    gatsby-plugin-feed: 2.5.10 => 2.5.10
    gatsby-plugin-force-trailing-slashes: 1.0.4 => 1.0.4   
    gatsby-plugin-manifest: 2.4.17 => 2.4.17
    gatsby-plugin-offline: 3.2.16 => 3.2.16
    gatsby-plugin-react-helmet: 3.3.9 => 3.3.9
    gatsby-plugin-sharp: 2.6.17 => 2.6.17
    gatsby-source-filesystem: 2.3.18 => 2.3.18
    gatsby-source-ghost: 4.0.5 => 4.0.5
    gatsby-transformer-sharp: 2.5.10 => 2.5.10
  npmGlobalPackages:
    gatsby-cli: 2.12.60

[mattfelten]

I'm getting this too with my project. I'm not seeing it locally though which is weird. But my Netlify build is giving me the same error.

[AndrejGajdos]

I have the same issue from today.

[danielmacuare]

+1 Here. I'm having the same issue while doing the following:

gatsby new damt-blog https://github.com/TryGhost/gatsby-starter-ghost
gatsby develop

[andyhmltn]

Also seeing this locally on an existing gatsby installation

[andyhmltn]

I upgraded gatsby to 2.24.18 and this appears to be fixed

[AndrejGajdos]

Thanks @andyhmltn. I don't see an error with that version.

[def-not-ys]

@andyhmltn would you mind explaining how to upgrade gatsby? (I am new to web development). thanks

[andyhmltn]

@def-not-ys If you're using yarn:yarn upgrade [email protected] or if you're using npm: npm install [email protected] --save

Let me know if that doesn't work. I haven't tested as I already upgraded this morning :)

[def-not-ys]

@andyhmltn Thanks! Yes upgrading gatsby fixed the error on building development.
I did not see the option of [email protected] so I upgraded it up [email protected].
however now I am getting a bunch of errors on GraphQL. but it successfully built the development bundle.
Upgrading seems to the fix to this issue. Thank you so much!
will close this issue now.

[andyhmltn]

@def-not-ys Great news 👍

[sunshine940326]

I have the same issue from today.