GraphQL issues on v4

[lexisother]

Hello all,
I had recently started a new project with Gatsby after using it multiple times before, but this time, using v4.
Though, now, using GraphQL in my gatsby-node.js is giving me problems, unlike before when using 3.0.0-next.
Before, I could do the following without any problems:
https://github.com/lexisother/GDOS-Website/blob/0b89ee793a20112d92e5acf30b49a78daba9143e/gatsby-node.js#L76-L87

Now, I'm running into the following issue. Could anyone lend me a hand?