Code with Hugo

When testing code with Jest, it can sometimes be useful to fail a test arbitrarily. This post goes through a few scenarios where that might be useful and how to fail a Jest test explicitly/in a forced manner. It also presents more idiomatic Jest patterns that could be used interc ...

There are occasions when running a Python/Ruby/PHP shell script from Node.js is necessary. This post looks at best practices around leveraging child_process.spawn and child_process.exec to encapsulate this call in Node.js/JavaScript. The goal here is to have an interoperability l ...

JavaScript import/require module testing do’s and don’ts with Jest The example repository is available at github.com/HugoDF/mock-spy-module-import. This post goes through how to achieve different types of module mocking scenarios with Jest. From simple Import interce ...

The technical term, “crawling” means accessing websites automatically and obtaining data. Web crawlers, spiders, or search engine bots download and index web content from the Internet. Search engines, like Google, use bots or web crawlers and apply search algorithm to ...

When debugging or writing units tests with Jest it can be useful to specify a single file or test to run or to exclude a specific failing test for the Jest run. This post goes how to skip and exclude a single test, a whole Jest test suite and a whole Jest test file using the CLI ...

Static site generators like Hugo, Jekyll, Hexo, Gatsby or other JAMstack alternative are a great option to run your blog on. One of the earliest and possibly most painful issues you will come across is “How do I schedule content to publish for later?”. In the traditional database ...

Detecting control-click, command-click, meta-click, alt-click and shift-click in JavaScript without listening to keydown events is straightforward. The naive approach is to bind aggressively to key events (keydown, keypress, keyup) and to maintain state of what is currently press ...

micro-analytics-events - A Node.js microservice to record analytics events to SQLite3 with Zeit’s “micro” In order to finally switch off Google Analytics, I need to replace my goal conversion tracking somehow. I’ve got pageview data using Simple Analytics ...

By default Jest runs tests in parallel with a “a worker pool of child processes that run tests” (Jest CLI docs). As per the Jest documentation, running tests in sequence (serially), can be helpful for debugging purposes and for test run performance reasons. ...

How does one identify whether a JavaScript file is being run directly (node file.js) or it’s being import/require-d (require('./file') in another JS file). In Python the pattern leverages the __main__ property in modules like so: if __name__ == '__main__': # do some ...