ReScript is a language and compiler toolchain for building performant, easy-to-maintain JavaScript and ReactJS applications. It is a strongly typed language with many interoperability features to integrate nicely in existing JavaScript codebases.
Questions tagged [rescript]
78 questions
2
votes
1 answer
How to force a function to return 'unit' in Rescript?
I am trying to simulate a side effect of writing to DB with rescript.
So I want to push the data in an array when calling repository.add. Js.Array.push returns an int, which I do not care about. I would like to force to return unit so that my…
JeromeBu
- 1,099
- 7
- 13
2
votes
1 answer
Rescript and using ReProcessing
I've had a lot of trouble trying to install Reprocessing, a kind of basic graphics library that can be used from ReasonML or ReScript, and which has been updated in various ways, but the documentation/README is a bit incomplete, and various sources…
John
- 509
- 1
- 6
- 18
2
votes
1 answer
How to read JSON with unknown key in ReasonML?
I am writing a simple application that display dog images from Dog API. I used bs-json to make it a record and use it later. The list of breeds can be obtained by the API. The response looks like this.
{
"message": {
"breed": ["array of…
Pontakorn Paesaeng
- 135
- 2
- 8
2
votes
1 answer
How would I write a generic function to handle multiple record types in ReScript?
Given the following contrived example, is it possible to write a get function that can handle any record with an a property?
type type_one = {a: int}
type type_two = {a: int, b: int}
let example_one = {a: 1}
let example_two = {a: 1, b: 2}
let get…
nickbreaton
- 65
- 1
- 7
2
votes
1 answer
How to write short local open in ReScript?
This compiles in ReasonML:
let testFn = who => Js.(log("Hello " ++ who ++ "!"));
but not in ReScript:
FAILED: src/test.ast
Syntax error!
/xxx/src/test.res:1:25-27
1 │ let testFn = who => Js.(log("Hello " ++ who ++ "!"));
2 │
I'm not…
menfon
- 1,587
- 1
- 11
- 28
2
votes
1 answer
Infinite Lists / Streams in ReScript
I can't seem to find the correct typing for an infinite list in ReScript.
I first tried:
type rec stream<'a> = ('a, () => ('a, stream<'a>))
Which was incorrect because ReScript thought the type was cyclic. So instead I tried:
type rec stream<'a> =…
Ryan Schaefer
- 3,047
- 1
- 26
- 46
2
votes
3 answers
How do you call an uncurried function with unit in ReScript/ReasonML?
Say that I have an uncurried function like:
let echo(. a) = a;
I can call this funcition fine with most literals like:
echo(. 1)
echo(. "Hello")
but when I am trying to call it with void, I get an error:
echo(. ()) //This function has arity1 but…
namesis
- 157
- 10
2
votes
1 answer
How to get away from Non-capitalized key value for Record construction?
I am using graphql, nexus-plugin-prisma, prisma to build a backend application using ReScript. The problem I face is that there are some columns starting with capital letter, and I want to set types for such schemas using records instead of objects.…
Sanghyun Kim
- 161
- 1
- 12
1
vote
1 answer
ReScript React how to import CSS files?
I am working on porting an existing React App to ReScript React, however I am running into a few issues. Namely I can't for the life of me figure out how to import CSS in ReScript, for example, In React to import Bootstrap all I would have to do…
Rawley Fowler
- 1,366
- 7
- 15
1
vote
1 answer
npm build failing due to rescript cannot handle multiple files error
Error:
rescript: [32/234] src/C...ts/Common/Transition.cmj
FAILED: src/Components/Common/Transition.cmj
can not handle multiple files
Caused when I ran:
npm start
or
yarn start
bsconfig.json contents [name doesn't have any spaces]
{
"name":…
Pragati Bhattad
- 43
- 1
- 6
1
vote
1 answer
I tried to install Pupilfirst LMS
I tried to install Pupilfirst LMS, I had difficulty in step
Compile Rescript Code: yarn run re: build
Output: Usage Error: could't find a script named "re: build".
And I also have difficulty in step
Run Webpack Dev Server: yarn run wds
Output:…
Neo Fiii
- 11
- 1
1
vote
1 answer
How can I use react-datepicker in the ReScript app
I`m trying to use an external library such as react-datepicker.
My code and usage:
module DatePicker = {
@react.component @module("react-datepicker")
external make: () => React.element = "default";
}
@react.component
let make = () => {
…
Grigoryev
- 47
- 1
- 5
1
vote
2 answers
Trouble translating JavaScript to ReScript
I wanted to implement an interactive slider using ReScript, so I wanted to translate this JavaScript to ReScript (courtesy: https://www.w3schools.com/howto/howto_js_rangeslider.asp):
var slider = document.getElementById("myRange");
var output =…
Namudon'tdie
- 306
- 1
- 10
1
vote
1 answer
Rescript-react: Creating a hidden canvas element
I am creating a simple react app (HTML) that allows a user to browse to an image on their local pc, and then displays it in an image tag. I want to take a data-url and dynamically create a hidden canvas tag (open to a different approach, but I want…
akaphenom
- 6,728
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1
vote
0 answers
Add mouselistener on children
I'm using ReasonML.
I would like to create a tooltip element. It should wrap a React.element and provide tooltip functionality, triggered by mouseevents.
But I would not like it to appear in the DOM at all, because that can disrupt the layout. I've…
user3189932
- 11
- 1