thespyder / rescript-nodejs Goto Github PK

How to use childprocess.send and process.on("message")?

main

const child = fork('xxx')
child.send("hi")

child

process.on("message', () => {})

According to Nodejs Document: lstat() is identical to stat(), except that if path is a symbolic link, then the link itself is stat-ed, not the file that it refers to ,The signatures should be same, But actually it is string => Js.Promise.t<Stats.t> = "lstat" for lstat and FileHandle.t => Js.Promise.t<Stats.t> = "stat" for stat

Hi there,

I just started learning ReScript and I would like to use it for a NodeJS application. I'm trying to port this piece of NodeJS code to ReScript using rescript-nodejs but I can't find a way to use Readline module:

const fs = require('fs');
const readline = require('readline');

const rl = readline.createInterface({
  input: fs.createReadStream('sample.txt'),
  crlfDelay: Infinity
});

rl.on('line', (line) => {
  console.log(`Line from file: ${line}`);
});

I couldn't find any documentation on Readline module. Can you give me some hints? I just want to read a text file line by line.

If this is not the right place, where should I ask this kind of question?
Thanks.

First, thank you for taking the time to make these bindings. They are extremely useful.

I see that push is defined with unit return type. It should have bool return type. The return value is needed for back-pressure.

The biggest issue I had with uncurried was a compiler bug: rescript-lang/rescript-compiler#6517. This hasn't been released yet but I've confirmed it with a local compiler build.

However there is a limitation that doesn't seem like it can be fixed: rescript-lang/rescript-compiler#6531

The solution is just to offer multi-arg function types in the Event module.

I get the following error after newly adding this package to a new project:

> [email protected] build /home/jasoons/Documents/code/envio/envio-operator
> rescript build

Dependency on @ryyppy/rescript-promise
rescript: [5/5] src/Promise.cmj
rescript: [7/7] install.stamp
Dependency on rescript-nodejs
rescript: [58/118] src/Module-NodeJs.cmj
FAILED: src/Module-NodeJs.cmj

  We've found a bug for you!
  /home/jasoons/Documents/code/envio/envio-operator/node_modules/.pnpm/[email protected]/node_modules/rescript-nodejs/src/Module.res:1:9-19

  1 │ include Node_module
  2 │ 

  The module or file Node_module can't be found.
  - If it's a third-party dependency:
    - Did you list it in bsconfig.json?
    - Did you run `rescript build` instead of `rescript build -with-deps`
      (latter builds third-parties)?
  - Did you include the file's directory in bsconfig.json?

rescript: [79/118] src/Buffer-NodeJs.cmj
FAILED: src/Buffer-NodeJs.cmj

  We've found a bug for you!
  /home/jasoons/Documents/code/envio/envio-operator/node_modules/.pnpm/[email protected]/node_modules/rescript-nodejs/src/Buffer.res:1:10-20

  1 │ type t = Node.buffer
  2 │ open Js.TypedArray2
  3 │ 

  The module or file Node can't be found.
  - If it's a third-party dependency:
    - Did you list it in bsconfig.json?
    - Did you run `rescript build` instead of `rescript build -with-deps`
      (latter builds third-parties)?
  - Did you include the file's directory in bsconfig.json?

rescript: [97/118] src/Assert-NodeJs.cmj
FAILED: cannot make progress due to previous errors.
Failure: /home/jasoons/Documents/code/envio/envio-operator/node_modules/.pnpm/[email protected]/node_modules/rescript/linux/ninja.exe 
Location: /home/jasoons/Documents/code/envio/envio-operator/node_modules/rescript-nodejs/lib/bs
 ELIFECYCLE  Command failed with exit code 1.

I'll clone locally and investigate a bit - seems strange - but I also don't know what Node_module is.

It looks like timers/promises is the only new API:
https://epnovate.com/blog/whats-new-in-node-v16/

https://nodejs.org/api/timers.html#timers-promises-api

This will be a good chance to release the first of some breaking changes that are long overdue to leverage new ReScript capabilities.

Unless I am not seeing something very obvious, why is everything in Process module typed (t, ...) => ...?

Something as seemingly trivial as NodeJs.Process.exit(0) just wouldn't work.

To support uncurried mode I patched the multi-argument event handler in a test. Turns out it was never actually used, so it triggers a compile failure
rescript-lang/rescript-compiler#6531 (comment)

It needs to be deleted unless someone finds an actual use for this and then I'll figure out how to implement it properly.

I would like to use async/await from the 10.1 version of the compiler.

Can you provide instructions to build it or are you planning on updating the package soon?

Currently, the greatest version is 14.3.0 and the latest version is 14.2.1. Because of this, if a user sets their rescript-nodejs version to "^14.2.1", they will receive the older 14.3.0.

Publishing the current head of main as version 14.3.1 to resolve this issue.

Also, I noticed that the change here isn't backwards-compatible. Publishing the change as 14.3.0 from 14.2.0 violated NPM's semantic versioning convention.