Moving from Flow to TypeScript for static typing

#420 — January 18, 2019
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Exploring JavaScript Modules: From IIFEs to CommonJS to ES6 Modules — A commonly ‘under-learned’ aspect of JavaScript is the module system, but given its unusual and varied history, that might not be a surprise. In this post (which also comes in video form), Tyler McGinnis provides a useful refresher of module approaches, both past and present.
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Porting 30K Lines of Code From Flow to TypeScript — The story of how MemSQL ported 30 thousand lines of JavaScript from using the Flow static type checker to TypeScript. In related news, the Jest project (which is owned by Facebook, as is Flow) is also planning a switch to TypeScript.
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Why I’ve Stopped Exporting Defaults From My Modules — The creator of ESLint says that after years of fighting with default exports, he’s taking a different approach. He makes a compelling argument.
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Animating URLs with JavaScript and Emojis — Half fantastic and half terrifying, this is a cute look at a technique to make your location bar a lot more memorable in a variety of ways..
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How to Start a Node Project — Short and sweet but there are a few neat tidbits here I wasn’t familiar with.
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Being Type Strict Without Writing TypeScript — Explains how you can write typed JSDoc annotations in comments and have type safety checked in the IDE. An interesting compromise that may suit some setups or if you want to ‘try out’ static typing without going all in.
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🔧 Code and Tools

Code to Graph: Visualize JavaScript Code as a Network Diagram — Certainly an interesting idea and fun to play with. Source here.
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NS:IDE: A JS IDE for Accessing a Phone/Tablet’s Native Runtime — Uses NativeScript’s bindings to access native functionality.
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✅ ZingGrid: Web Component-Based JavaScript Data Grid & Table Library — Make responsive data grids and tables with CRUD functionality, built-in layout modes, column types and more with ZingGrid.
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wpk: A Friendly, Intuitive, and Unofficial CLI for webpack
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jsdiff: A JavaScript Text Diffing Implementation — Can compare strings for differences in various ways including creating patches for such changes. The library is quite mature but just reached version 4.0.
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AlaSQL: A JavaScript SQL Database for Browser and Node.js — Handles both traditional relational tables and nested JSON data (NoSQL). Export, store, and import data from localStorage, IndexedDB, or Excel.
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Shiny: Shiny Reflections for Mobile Websites — Add shiny reflections to page elements on devices that support DeviceMotion.
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SurveyJS: A JavaScript Survey and Form Builder — Can integrate with Angular, jQuery, Knockout, React and Vue.js. Live demo here.
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Sockette: A Tiny WebSocket Wrapper — A 348 byte wrapper around WebSocket that auto reconnects when necessary.
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P.S. Next Tuesday (22nd), a long-time reader and friend of JavaScript Weekly, Brian Rinaldi, is hosting two great talks in an online event called JavaScript for Enterprise Development. It’s free and no strings attached so check it out.

Link: https://javascriptweekly.com/issues/420