tsafe

A collection of utilities to take your TypeScript development up a notch





















This module is tree shakable

Documentation

Make sure two types are identical










Playground

A assertion function that typescript understands

Make sure your zod schema exactly matches a given type:





Playground

Make sure you never forget a case in a switch







Playground

Make TypeScript believe whatever you say without having to write const obj2 = obj as Bar.


The more powerfully is to be able to tell TypeScript that obj ist not of type Bar:

Motivations

Powerful TypeScript features like assertion functions or user-defined type guards are only useful if paired with utility functions.

TypeScript, however, only exports type helpers \(e.g. Record, ReturnType, etc.\).

This module provides _«the missing builtins»_ such as the assert function and other utilities that cannot be just type helpers.

Documentation website

Installation

tsafe is both an NPM and a Deno module.
(Achieved with denoify)

Import in deno:

``typescript
import { assert, type Equals, ... } from "https://deno.land/x/tsafe/mod.ts";
`

Install elsewhere:

`bash
$ npm install --save tsafe
``