fstoerkle / ReasonablyTyped

:diamond_shape_with_a_dot_inside: Converts Flow and TypeScript definitions to Reason interfaces

  $ npm install --global reasonably-typed

Converts TypeScript and Flow definitions to Reason interfaces

---

Take your Flow or TypeScript definition

// class.js
declare module 'classes' {
  declare type State = {
    id: number,
    storeName: string
  };

  declare export class Store {
    constructor(initialState: State): Store;
    state: State;
    update(nextState: State): void;
  }
}

Run retyped

$ retyped compile class.js

Get Reason

/* Module classes */

type state = Js.t {. id : float, storeName : string};

type store = Js.t {. state : state, update : nextState::state => unit [@bs.meth]};

external create_store : initialState::state => store =
  "Store" [@@bs.new] [@@bs.module "classes"];

Docs

Examples

TypeScript

TypeScript has a similar workflow. Compile your TypeScript file with:

$ retyped compile my-definition.d.ts

FlowTyped

ReasonablyTyped can automatically compile all FlowTyped definitions in your repo. Run

$ retyped compile --flow-typed

Command-line Usage

retyped

Commands:
  compile [files...]  Generate BuckleScript interfaces from a file

Options:
  --version     Show version number                                    [boolean]
  --help        Show help                                              [boolean]

Usage as a library

ReasonablyTyped also exports a library for use! See the example below:

// lib-usage.js
import * as ReasonablyTyped from 'reasonably-typed'

const libSrc = fs.readFileSync('lib.js').toString()
const bsInterface = ReasonablyTyped.compile(libSrc)

format (code: string) => string

Formats a block of code using refmt

compile (code: string, filename?: string) => string

Compiles a libdef, formats the result, and handles errors cleanly

Status

Roadmap

• Basic types like string
• Function types
• Record types
• Literals as types
• Union types
• Instersection types
• Named types
• Optional parameters
• Classes
• Generics
• Built-ins like Promises
• React components