rescript-intl

rescript-intl helps you with date, number and currency formatting in ReScript. Everything is built on top of Intl which comes built-in with browsers >= IE11 as well as Node.

Get started

npm install @opendevtools/rescript-intl

Add rescript-intl in bsconfig.json

{
  "dependencies": ["@opendevtools/rescript-intl"]
}

Examples

DateTime

let today = Intl.DateTime.make(~locale=Some("sv"), ());
// today: string = "2020-03-18"

with custom date

let date = Js.Date.makeWithYMD(~year=2020., ~month=11., ~date=12., ());

let futureDate = Intl.DateTime.make(~date, ~locale=Some("sv"), ());
// futureDate: string = "2020-12-12"

with date as string

let futureDate = Intl.DateTime.makeFromString(~date="2020-11-12", ~locale=Some("sv"), ());
// futureDate: string = "2020-11-12"

and with some options

let today =
  Intl.DateTime.make(
    ~locale=Some("sv"),
    ~options=
      Options.make(
        ~year=Some(#numeric),
        ~weekday=Some(#long),
        ~day=Some(#"2-digit"),
        ~era=Some(#narrow),
        ~month=Some(#long),
        (),
      ),
    (),
  );
// today: string = "onsdag 18 mars 2020 e.Kr".

NumberFormat

Currency

let krona =
  Intl.NumberFormat.Currency.make(
    ~value=1000.,
    ~currency="SEK",
    ~locale=Some("sv"),
    (),
  );
// krona: string = "1 000,00 kr"

Decimal

let parsedNumber =
  Intl.NumberFormat.Decimal.make(~value=1000., ~locale=Some("sv"), ());
// parsedNumber: string = "1 000,00"

Percent

let percent =
  Intl.NumberFormat.Percent.make(~value=0.3456., ~locale=Some("sv"), ());
// percent: string = "34,56 %"

ListFormat

// And based lists (default, #type = #conjunction) in Swedish
let data =
  Intl.ListFormat.make(["Cat", "Tiger", "Lion"], ~locale=Some("sv"), ());
// data: string = "Cat, Tiger och Lion"

// Or based lists
let data =
  Intl.ListFormat.make(["Cat", "Tiger", "Lion"],
  ~options=Options.make(~type_=Some(#disjunction), ()), ());
// data: string = "Cat, Tiger, or Lion"

// Unit based lists
let data =
  Intl.ListFormat.make(["Cat", "Tiger", "Lion"],
  ~options=Options.make(~type_=Some(#unit), ()), ());
// data: string = "Cat, Tiger, Lion"

let data =
  Intl.ListFormat.make(["Cat", "Tiger", "Lion"],
  ~options=Options.make(~type_=Some(#unit), ~style=Some(#narrow), ()), ());
// data: string = "Cat Tiger Lion"

Short, #short, and narrow, #narrow, styles are only available for #unit type. If you pass in any other type than #unit with those styles, the library takes care of it and changes the type to #unit.

Node

Node 13 added full ICU support and there should be no issues with wrong formatting. If you need to run a Node version before 13 it only has support for en-US locale by default. If your code is failing with wrong formatting you'll need to install full locale support using:

npm install -g full-icu

The installer will print out what you need to set the environment variable NODE_ICU_DATA to in order to get full support.