babel-loader VS cross-env

babel-loader

Uncaught TypeError: Object.assign is not a function I'm already using babel-loader to transpile ES6 to ES5, so all my other ES6 code is working. Yet, Object.assign() only works after I also import "babel-core/polyfill" in my codebase. I see that I can also fix this by importing babel-runtime, but I'd like to understand why Object.assign() requires more than what babel-loader performs — shouldn't babel-loader preprocess everything, including Object.assign()?

It looks like this may be an old version of webpack according to [this GitHub issue](https://github.com/babel/babel-loader/issues/798).

And babel/webpack seems to get upset at re-exporting things that don't exist at runtime (types and interfaces): https://github.com/babel/babel-loader/issues/603. So, you need to be careful to re-export your types with a different syntax, which is hard to remember when you're writing a file full of export * from 'foo'.

Apparently, this is usually a problem with Babel 7 and plugins but I've upgraded the plugins and still have this issue: https://github.com/babel/babel-loader/issues/560

There are many ways to integrate TypeScript with an existing Webpack configuration. If you use the babel-loader package to transpile JavaScript files, you can add the @babel/preset-typescript preset to generate JavaScript files and the Fork TS Checker Webpack Plugin package to run the TypeScript type checker so that the build fails if there are type errors.

cross-env

or if we care about cross-platform compatibility (i.e. Windows support), we can use cross-env (which I also recommend to install as a dev dependency):

i like to use dotenv-flow and dynamically load it into node process. it's framework agnostic and can be combined with vaious other strategies, like explicitly set NODE_ENV with cross-env. all you need is the right command in your package.json, see a sample here.

Cross-env runs scripts that set and use environment variables across various platforms.

You will also need to disable the url-loader in your Docusaurus build which transforms images into base64 strings, as this will conflict with the plugin. There isn't a first class way to do this in Docusaurus at present. However by setting the environment variable WEBPACK_URL_LOADER_LIMIT to 0 you can disable it. You can see an implementation example in this pull request. It amounts to adding the cross-env package and then adding the following to your package.json:

Using the cross-env library, you'll tell the React Testing Library to skip auto cleanup after each test. More info and ways to configure here: Skipping Auto Cleanup. Now your configuration is enough to start writing tests, let's get started.

Now we need to load the files during the bootup. Windows environments sometimes face issues with loading the environments. To take care of that, let's install a package named cross-env

build; sets and enviroment valiable of NODE_ENV=production using cross-env lib and builds the production bundle, minified and without source-maps as set in the webpack.config.js file.

I'd suggest the cross-env NPM package which is used a lot (4M downlaods/week). Then you can just change it to the following:

Debugging Cypress tests using Visual Studio Code was possible earlier but with the latest version of Cypress, there is no direct way to do so. Even with the latest version of Cypress, a workaround was possible using Debugger for Chrome – a Visual Studio Code Extension and cross-env npm package. However, the Debugger for Chrome Extension for Visual Studio Code is deprecated and the cross-env npm package has gone into maintenance mode.