Pages config is not injected when generators using with typescript

[bicstone]

Pages config is not injected when using gatsby-config.ts.
Gatsby will ignore pathPrefix and build the site as if hosted from the root domain.

To Reproduce

1. Create Gatsby Project with TypeScript
2. Add deploy action from template
3. Run Workflow

Run actions/configure-pages@v2

Using default blank configuration
Injecting property=pathPrefix and value=/temp-gatsby-starter-ts/ in:
// Default Pages configuration for Gatsby
module.exports = {}

Found configuration object in direct module export
Injection successful, new configuration:
// Default Pages configuration for Gatsby
module.exports = {pathPrefix: "/temp-gatsby-starter-ts/"}

Injecting property=siteMetadata.siteUrl and value=https://bicstone.github.io/ in:
// Default Pages configuration for Gatsby
module.exports = {pathPrefix: "/temp-gatsby-starter-ts/"}

Found configuration object in direct module export
Injection successful, new configuration:
// Default Pages configuration for Gatsby
module.exports = {siteMetadata: {siteUrl: "https://bicstone.github.io/"},pathPrefix: "/temp-gatsby-starter-ts/"}

https://bicstone.github.io/temp-gatsby-starter-ts/

[bicstone]

I tried adding the generator_config_file: './gatsby-config.ts' option but it did not work.

Run actions/configure-pages@v2

Injecting property=pathPrefix and value=/temp-gatsby-starter-ts/ in:
import type { GatsbyConfig } from 'gatsby';

const config: GatsbyConfig = {
  // Since `gatsby-plugin-typescript` is automatically included in Gatsby you
  // don't need to define it here (just if you need to change the options)
  plugins: [],
  jsxRuntime: `automatic`,
};

export default config;

Warning: We were unable to determine how to inject the site metadata into your config. Generated URLs may be incorrect. The base URL for this site should be [https://bicstone.github.io/temp-gatsby-starter-ts/.](https://bicstone.github.io/temp-gatsby-starter-ts/) Please ensure your framework is configured to generate relative links appropriately.

[yoannchaudet]

👋 actions/configure-pages does not support or understand TypeScript today. And it is really hard to support all the things when a language parser is required.

You probably want to configure Pages manually yourself in this case since you are a bit out of the "default" paths.

[bicstone]

Thank you for your reply!
gatsby-config.ts is configured in the Gatsby official starter, although it is out of the default.
https://github.com/gatsbyjs/gatsby/tree/gatsby%404.24.0/starters/gatsby-starter-minimal-ts

It would be nice if you could be able to warn that extensions other than .js, .cjs, .mjs are not supported if specified in generator_config_file.