Deno Newsletter #36 - v0.20.0

Welcome to Deno Newsletter issue #36!

Every week we serve you with a bunch of useful information and links for every Deno enthusiast.

Useful links:


v0.20.0 released with JSX support, Top-Level-Await typescript support, window.onunload, and many other features, bug fixes, and performance enhancements.

— Deno (@deno_land) October 7, 2019

This week Deno v0.20.0 was released, including many improvements:

  • feat: JSX support (#3038)

かつてここまでコピペで動くwebサーバーがあっただろうか #denoland

— keroxp (@keroxp) October 8, 2019

  • feat: window.onunload (#3023)
  • feat: New ops API - Isolate::register_op (#3002, #3039, #3041)
  • fix: Async compiler processing (#3043)
  • fix: Support top-level-await in TypeScript (#3024)
  • upgrade: V8 to 7.9.218 (#3067)
  • upgrade: rust to 1.38.0 (#3030)
  • chore: Migrate CI to GitHub actions (#3052#3056#3049#3071#3076#3070, #3066#3061#3010)

The deno repo has successfully moved to Github Actions! On every push, we build all the code in V8 and Deno on Mac, Linux, and Windows in about 10 minutes! GHA's 20 concurrent builds quota is a dramatic improvement over our previous Travis/Appveyor CI setup.

— Deno (@deno_land) October 4, 2019

Important changes to standard library

Full list of changes can be found here


There are Japanese and English
Denobook2!#denoland #技術書典7

— sasurau4 (@sasurau4) October 6, 2019

Read more and get your Denobook at


The YouTube video at no longer exists.


Can you Deno? Deno programming is a sought after job skill. 🦕

— deno (@deno_community) October 9, 2019

Thanks for reading and stay tuned for more news next week!

- Bartek

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