Rutypi a runtime type information and verify library

Rutypi is a library which allows you to automatically export type information for runtime usage.
Additionally, it provides a mechanism to check if an object matches it's declared type out of the box.

Requirements

In order to use rutypi you will need

1. Webpack version 5
2. Typescript version 4

Setup

The setup is done by adding RutypiWebpackPlugin to your webpack plugins.
That's it, you're ready to start!

Minimal Webpack example (webpack.config.js):

const { RutypiWebpackPlugin } = require("rutypi/webpack");

module.exports = {
    entry: './src/index.ts',
    plugins: [
        new RutypiWebpackPlugin(),
    ],
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                exclude: /node_modules/,
                loader: "ts-loader"
            },
        ],
    },
    resolve: {
        extensions: ['.tsx', '.ts', '.js'],
    },
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist'),
    },
};

Usage

The following methods are offered by the runtime library:

• typeInfo
• validateType
• lookupReference

typeInfo

Retrieve type information at runtime about the given type. Example:

import { typeInfo, lookupReference } from "rutypi";

type MyType = {
    key: string,
    value: number,
    ref: MyType | undefined
};

/* Value: { type: 'object-reference', target: 'T43_MyType' } */
let info = typeInfo<MyType>();
if(info.type === "object-reference") {
    /*
     * Will print:
     *  {
     *    type: 'object',
     *    members: {
     *      key: { type: 'string' },
     *      value: { type: 'number' },
     *      ref: {
     *        type: 'union',
     *        types: [
     *          { type: 'object-reference', target: 'T43_MyType' },
     *          { type: 'undefined' },
     *          { type: 'null' },
     *        ]
     *      }
     *    },
     *  }
     */
    console.log("Reference output: %o", lookupReference(info));
}

validateType

Validate the given object according to the type specification of the given template argument.
If the object doesn't match the type declaration an error will be thrown or returned. Example:

import { validateType } from "rutypi";

type MyType = {
    key: string,
    value: number,
    ref?: MyType
};

let validatedObject = validateType<MyType>({ key: "a", value: 123 });

lookupReference

Lookup type references to other types.
A type reference in this manner will most likely be a named type or interface.
An example could be found here.

Examples

Fully functionally examples can be found within the examples folder.

Limitations

This plugin can not be used with transpileOnly setting enabled for ts-loader. When enabled, the TypeScript compiler will not gather any type information nor index any .d.ts files.