The highlight of this release is the new function util.parseArgs():

import { parseArgs } from 'node:util';
const args = ['-f', '--bar', 'b'];
const options = {
  foo: {
    type: 'boolean',
    short: 'f'
  },
  bar: {
    type: 'string'
  }
};
const {
  values,
  positionals
} = parseArgs({ args, options });
console.log(values, positionals);
// Prints: [Object: null prototype] { foo: true, bar: 'b' } []

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

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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.