Runtime type validation generator

Generator of validation script of type defined in Flow or TypeScript.

This tool replace JSON schema or io-ts in user friendly way when you use static typed JavaScript. You can use just your type definition in Flow or Typescript and generate validation functions.

Ideal for API validation using JSON or CSV.

NOTE: This tool use babel-plugin-tcomb. It contains older definition of Flow types. This tool is for basic types checking. Not use unnecessarily complex type definition.

Features

• CLI API to generate Flow typed validation functions
• CLI API to generate TypeScript typed validation functions
• WebPack plugin

Installation

npm install --save-dev runtime-type-validation-generator
npm install --save tcomb

CLI

rtvg ./typesDefinitionFile.js ./validationsFile.js

or

npx rtvg ./typesDefinitionFile.js ./validationsFile.js

Example

Usage

import type { Data } from "./typesDefinitionFile.js";
import { validateData } from "./validationsFile.js";

async function getData(url: string): Data {
    const response = await fetch(url);
    return validateData(await response.json());
}

Types definition file

export type Data = {
    id: string,
    order: number,
    content: Array<Data>,
};

Validations file

export function validateData(data: mixed): Data;