Highlights:

• Error overlay for React
• Support for source maps in Hot Module Reloading
• Locally scoped variables in CSS modules

Main changes:

• Outdated packages were updated.
• Support for Node.js v10 and v12 was deprecated.
• Publishing the Lerna repo locally was improved.

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This blog post compares three JavaScript constructs for processing Arrays non-destructively: for-of loops, the Array method .reduce(), and the Array method .flatMap(). It explains how the latter two work. To get a feeling for how these constructs differ, the following functionality is implemented with each of them (if possible):

• Filtering an input Array to produce an output Array
• Mapping each input Array element to one output Array element
• Expanding each input Array element to zero or more output Array elements
• Filter-mapping (filtering and mapping in one step)
• Computing a summary for an Array
• Finding an Array element
• Checking a condition for all Array elements

This library “installs dependencies from a local checkout, and keeps them in sync, without the limitations of npm/yarn link”.

“At EdgeDB, we built and maintain a first-party client library for Node.js that’s available as the edgedb module on NPM. However, Deno uses a totally different set of practices to handle dependencies, namely direct URL imports from public package registries like deno.land/x. We set out to find a simple way to “Denoify” our codebase; that is, generate a Deno-compatible module from our existing Node.js implementation with minimal refactoring.”

They used Deno’s Node.js compatibility library and wrote a codemod to add the filename extension .ts to imports, change usages of global Node.js variables such as process and Buffer to Deno-specific imports, etc.