Next.js: Flow type Next.js

[steida]

After several years, https://flow.org/ seems to be stable without surprises. Is Next.js team interested in Flow typing the source code? With exported types of course.

Flow supports comment types https://flow.org/en/docs/types/comments, so there is no need to add any additional transpilation step.

[jthegedus]

@steida Would this method also allow outputting .d.ts files too?

[timneutkens]

@steida we're planning to add flow with the transpilation step very soon 👍

@jthegedus I saw https://github.com/bcherny/flow-to-typescript

[jthegedus]

@timneutkens I'll keep the conversation here as to not create more issues.

I've been using Next.js with TS lately and found that the DefinitelyTyped @types/next types to not have 100% coverage and in addition, the repo has a lot of traffic and so it can take an indeterminate amount of time to get fixes merged. If a tool did exist to simply and reliably generate a .d.ts file from Flow types, would the team and yourself be open to maintaining the .d.ts file within this repo? Or would you defer that responsibility to the @types/next package?

Thanks for that link too :smiley:

[timneutkens]

I'm not sure yet, if it's easy to transpile from flow to typescript typings it'd be okay to keep them in the repository I guess 👍