@typeonly/validator

TypeOnly aims to be the pure typing part of TypeScript. This package provides an API to validate JSON and JavaScript objects with TypeScript definitions, using the TypeOnly parser.

Tutorial: How to programmatically validate JSON data

At first, it is necessary to follow the tutorial of TypeOnly in order to generate a .to.json file based on your TypeScript definitions. After this step, you have the following file: dist/types.to.json.

Now, add @typeonly/validator to the project:

npm install @typeonly/validator

Create a file src/validate-main.js with the following content:

// src/validate-main.js
const { createValidator } = require("@typeonly/validator");

const data = {
  color: "green",
  shape: {
    kind: "circle",
    x: 100,
    y: 100,
    radius: 50
  }
};

const validator = createValidator({
  bundle: require("./types.to.json")
});
const result = validator.validate("./drawing", "Drawing", data);
console.log(result);

This code validates the data object using RTO files generated by the TypeOnly parser.

Execute it:

$ node src/validate-main.js
{ valid: true }

Contribute

With VS Code, our recommanded plugin is:

• TSLint from Microsoft (ms-vscode.vscode-typescript-tslint-plugin)