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    0.0.6 • Public • Published

    Lazy VIN Library

    styled with prettier

    A very quick and very dirty library for getting random VINs.

    StackBlitz Demo App Using the Library


    Importing library

    Install via yarn/npm

    yarn add lazy-vin-lib

    You can import the generated bundle to use the whole library generated by this starter:

    import LazyVin from 'lazy-vin-lib'
    class MyClass {
      private lazyVin;
      constructor() {
        this.lazyVin = new LazyVin();
      someSlightlyBetterMethod(): string {
        return this.lazyVin.getRandomValidVin();
      someMethod(): string {
        return this.lazyVin.getRandomCleanVin();
      someRiskierMethod(): string {
        return this.lazyVin.getRandomDirtyVin();


    This library exposes the following methods:


    Returns a quick and dirty 'random' VIN, complete with a North American valid Check Digit.


    A simple, quick and dirty 'random' VIN. It is not guaranteed to be valid. ...did I mention it's quick and dirty?


    A simple, quick and 'clean' 'random' VIN. It is not guaranteed to be valid. ...did I mention it's quick and clean?

    What makes the return value more 'clean' is a randomly generated six digit unique identifier at the end of a given VIN. The aim is to lower the chances of getting a repeat VIN--not eliminate it.

    Features Offered by Seed Project

    NPM scripts

    • npm t: Run test suite
    • npm start: Run npm run build in watch mode
    • npm run test:watch: Run test suite in interactive watch mode
    • npm run test:prod: Run linting and generate coverage
    • npm run build: Generate bundles and typings, create docs
    • npm run lint: Lints code
    • npm run commit: Commit using conventional commit style (husky will tell you to use it if you haven't 😉)

    Excluding peerDependencies

    On library development, one might want to set some peer dependencies, and thus remove those from the final bundle. You can see in Rollup docs how to do that.

    Good news: the setup is here for you, you must only include the dependency name in external property within rollup.config.js. For example, if you want to exclude lodash, just write there external: ['lodash'].

    Automatic releases

    Prerequisites: you need to create/login accounts and add your project to:

    Prerequisite for Windows: Semantic-release uses node-gyp so you will need to install Microsoft's windows-build-tools using this command:

    npm install --global --production windows-build-tools

    Setup steps

    Follow the console instructions to install semantic release and run it (answer NO to "Do you want a .travis.yml file with semantic-release setup?").

    Note: make sure you've setup repository.url in your package.json file

    npm install -g semantic-release-cli
    semantic-release-cli setup
    # IMPORTANT!! Answer NO to "Do you want a `.travis.yml` file with semantic-release setup?" question. It is already prepared for you :P 

    From now on, you'll need to use npm run commit, which is a convenient way to create conventional commits.

    Automatic releases are possible thanks to semantic release, which publishes your code automatically on github and npm, plus generates automatically a changelog. This setup is highly influenced by Kent C. Dodds course on

    Git Hooks

    There is already set a precommit hook for formatting your code with Prettier 💅

    By default, there are two disabled git hooks. They're set up when you run the npm run semantic-release-prepare script. They make sure:

    This makes more sense in combination with automatic releases


    Array.prototype.from, Promise, Map... is undefined?

    TypeScript or Babel only provides down-emits on syntactical features (class, let, async/await...), but not on functional features (Array.prototype.find, Set, Promise...), . For that, you need Polyfills, such as core-js or babel-polyfill (which extends core-js).

    For a library, core-js plays very nicely, since you can import just the polyfills you need:

    import "core-js/fn/array/find"
    import "core-js/fn/string/includes"
    import "core-js/fn/promise"

    What if I don't want git-hooks, automatic releases or semantic-release?

    Then you may want to:

    • Remove commitmsg, postinstall scripts from package.json. That will not use those git hooks to make sure you make a conventional commit
    • Remove npm run semantic-release from .travis.yml

    What if I don't want to use coveralls or report my coverage?

    Remove npm run report-coverage from .travis.yml



    Check It Out

    Made with ❤️ by @alexjoverm and all these wonderful contributors (emoji key):



    npm i lazy-vin-lib

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