Recommended to use Rescript yet for production?

[loganmac]

Hi! Splitting my previous post up in hopes that it’s a bit less scary to restrain it to a single question.

I’m starting two new projects recently, and I’d like to use Rescript (was going to use Reason until I caught up to the announcement). One project is a web app, the other is a NodeJS CLI parsing tool.

Is Rescript (the syntax and tooling) ready for general use? I saw a post a while ago that said to use Reason for now because the editor tooling is more mature, and there are more tutorials/guides available.

[frustak]

About the tooling, as far as I know, syntax highlighting, formatting, and error diagnosis work with vscode extension. I hope type diagnosis and autocomplete would also be released soon as I’m not confident(or maybe just comfortable) enough to code without them because of unfamiliarity with the language.

[ryyppy]

We are currently working on the type-on-hover / goto-definition functionality, but this is still pretty experimental.

[danielo515]

I think this topic deserves an update? I am having quite nice experience with VSCode extension

[ryyppy]

Yeah. So to get back to the original question: Yes, ReScript (the syntax and platform) is ready for production. VSCode and Vim are supported out of the box and come with types-on-hover, autocompletion, jump-to-definition, etc.

We currently use the newest ReScript version within our product (React webapp), together with existing Flow + JS code. Pretty seamless experience, but I am also biased

[danielo515]

@ryyppy

React webapp

Do you mean the official react docs?

[peterh]

Are there any plans for live type-check/diagnostics while editing (without having to save the file) with the official VS Code plugin? I got used to this behaviour with Java and Haskell plugins, so I wondered if it is a design choice or just not implemented yet. It is not really bothering me that much, but would be convenient nonetheless.

[ryyppy]

@danielo515

Do you mean the official react docs?

No, I mean an actual product that is being used by paying customers. It is designed as a React based SPA.

@peterh

Are there any plans for live type-check/diagnostics while editing (without having to save the file) with the official VS Code plugin?

No plans at least what I am aware of. The current design allows us to keep the plugin state 100% reliable and memory footprint low. We know it’s not perfect, but at least it’s reliable and doesn’t break down on bigger codebases .

[fham]

It relies on a saved file, so you can’t.

But if it is too annoying for you, you can at least turn on autosave to have a more seamless experience:

Easy workaround in rescript-vscode for instant error reporting

As it bothered me that rescript-vscode requires a manual save to update error reporting, I found out a little workaround. Just use autosave by adding this to your settings.json: "files.autoSave": "afterDelay", "files.autoSaveDelay": 200, It seems that autosave does not include formatting, so you do not need to disable formatOnSave. NOTE: I only tested it in smaller files. If it affects performance too much, you could tweak the delay a bit.

[danielo515]

@ryyppy

No, I mean an actual product that is being used by paying customers. It is designed as a React based SPA.

OK, because you said react webapp I though you were referring directly to react library web app. I guess you mean a web app made using react of your company. I’m curious what the app is about