npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@builder.io/ts-transform-optional-chaining

v0.0.4

Published

Optional chaining (aka existential operator, safe navigation) support in TypeScript via the non-null assertion operator

Downloads

34

Readme

ts-transform-optional-chaining

A TypeScript custom transformer that enables optional chaining (aka existential operator, safe navigation) support in TypeScript via the non-null assertion operator.

npm version

Usage

With this plugin

foo!.bar!.baz

compiles to

foo && foo.bar && foo.bar.baz

so you can get that madness out of your code!

Requirement

TypeScript >= 2.4.1

How to use the custom transformer

Unfortunately, TypeScript itself does not currently provide any easy way to use custom transformers (See https://github.com/Microsoft/TypeScript/issues/14419). The followings are the example usage of the custom transformer.

webpack (with ts-loader or awesome-typescript-loader)

// webpack.config.js
const optionalChainingTransformer = require('@builder.io/ts-transform-optional-chaining/transformer').default;

module.exports = {
  // ...
  module: {
    rules: [
      {
        test: /\.ts$/,
        loader: 'ts-loader', // or 'awesome-typescript-loader'
        options: {
          getCustomTransformers: program => ({
              before: [
                  optionalChainingTransformer(program)
              ]
          })
        }
      }
    ]
  }
};

Rollup (with rollup-plugin-typescript2)

// rollup.config.js
import typescript from 'rollup-plugin-typescript2';
import optionalChainingTransformer from '@builder.io/ts-transform-optional-chaining/transformer';

export default {
  // ...
  plugins: [
    typescript({ transformers: [service => ({
      before: [ optionalChainingTransformer(service.getProgram()) ],
      after: []
    })] })
  ]
};

ttypescript

See ttypescript's README for how to use this with module bundlers such as webpack or Rollup.

// tsconfig.json
{
  "compilerOptions": {
    // ...
    "plugins": [
      { "transform": "@builder.io/ts-transform-optional-chaining/transformer" }
    ]
  },
  // ...
}

TypeScript API

See test for detail. You can try it with $ npm test.

const ts = require('typescript');
const optionalChainingTransformer = require('@builder.io/ts-transform-optional-chaining/transformer').default;

const program = ts.createProgram([/* your files to compile */], {
  strict: true,
  noEmitOnError: true,
  target: ts.ScriptTarget.ES5
});

const transformers = {
  before: [optionalChainingTransformer(program)],
  after: []
};
const { emitSkipped, diagnostics } = program.emit(undefined, undefined, undefined, false, transformers);

if (emitSkipped) {
  throw new Error(diagnostics.map(diagnostic => diagnostic.messageText).join('\n'));
}

License

MIT