[gatsby-plugin-mdx 4.1.1] Example of extending the GraphQL "headings" nodes would't work.

[FoundTheWOUT]

Preliminary Checks

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Description

The example of creating "headings" GraphQL node seem like missing some thing when calling the compileMDXWithCustomOptions.
The resolver yield "TypeError: Cannot read properties of undefined (reading 'getState')".
And i found the secend parameters of the compileMDXWithCustomOptions, which is a object owning "store" attribute. This object would be passed down to enhanceMdxOptions, which would call the getState from the store.

gatsby/packages/gatsby-plugin-mdx/src/compile-mdx.ts

Line 83 in e174fbb

store: NodePluginArgs["store"]

gatsby/packages/gatsby-plugin-mdx/src/plugin-options.ts

Line 55 in e174fbb

const { config } = helpers.store.getState()

Therefore, at the example, the object is missing the "store" attribute, undefined has no getState, and that causing the error.
But i have no idea what is the "store" meaning for, and what to pass in.

Reproduction Link

https://codesandbox.io/s/damp-sea-e242s4?file=/gatsby-node.js

Steps to Reproduce

Just follow the gatsby-plugin-mdx doc.

Expected Result

GraphQL resolve the heading properly.

Actual Result

GraphlQL yield "TypeError: Cannot read properties of undefined (reading 'getState')"

Environment

System: win11
Gatsby:4.22.1
gatsby-plugin-mdx:4.1.1

Config Flags

No response

[LekoArts]

Thanks! Between writing the README and publishing the new version the store arg was added and the example wasn't updated. store refers to the internal Redux store that Gatsby uses.

You can check #36593 to see what you'll need to change.