Provides a standard way of performing type and schema validation across 0x projects

Usage no npm install needed!

<script type="module">
  import 0xKlaytnAssert from 'https://cdn.skypack.dev/@0x-klaytn/assert';



Standard type and schema assertions to be used across all 0x projects and packages


yarn add @0x-klaytn/assert


import { assert } from '@0x-klaytn/assert';

assert.isValidBaseUnitAmount('baseUnitAmount', baseUnitAmount);

If your project is in TypeScript, add the following to your tsconfig.json:

"compilerOptions": {
    "typeRoots": ["node_modules/@0x-klaytn/typescript-typings/types", "node_modules/@types"],


We welcome improvements and fixes from the wider community! To report bugs within this package, please create an issue in this repository.

Please read our contribution guidelines before getting started.

Install dependencies

If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:

yarn config set workspaces-experimental true

Then install dependencies

yarn install


To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:

PKG=@0x-klaytn/assert yarn build

Or continuously rebuild on change:

PKG=@0x-klaytn/assert yarn watch


yarn clean


yarn lint

Run Tests

yarn test