Creator of TypeScript: 10x Faster Typescript, Why AI Won't Replace SWEs | Anders Hejlsberg

Anders Hejlsberg is the creator of TypeScript and C#, and I asked him about how the TypeScript compiler got 10x faster through a rewrite in Go and his thoughts on how AI has impacted software engineering.

• My ergonomic keyboard project I mentioned, you can follow along here: read.compose.llc
• The Kickstarter page for it: kickstarter.com/projects/ryanlpeterman/compose…

Podcast links:

• YouTube: youtube.com/watch?v=cywK3XYYJ2o
• Apple: podcasts.apple.com/us/podcast/the-peterman-pod…
• Transcript: developing.dev/p/creator-of-typescript-10x-fas…

Thank you to this episode's sponsors for supporting my work:

• WorkOS: makes your app Enterprise Ready with easy to use APIs to add SSO, SCIM, RBAC, and more in just a few lines of code, check them out at workos.com
• Jira by Atlassian: Get more work done with your favorite agents and models all in one place, check them out at jira.dev

Timestamps:

(00:00) Intro
(00:48) Why write a compiler in JavaScript
(07:29) Why rewrite the compiler in Go
(14:49) LLMs for large migrations
(20:12) Why Javascript is so popular
(26:32) Why ever use Javascript on the backend
(32:59) What it takes to build a programming language
(37:06) Will there be fewer languages in 10 years
(42:57) Hands on engineering vs delegation
(49:14) Why fast tooling matters more now
(51:16) AI software engineering predictions
(58:52) The most technically challenging work
(01:02:04) Top book recommendation
(01:03:50) Advice for his younger self
(01:05:00) Outro

Where to find Anders:

• GitHub: github.com/ahejlsberg
• X/Twitter: x.com/ahejlsberg
• Wikipedia: en.wikipedia.org/wiki/Anders_Hejlsberg
• LinkedIn: linkedin.com/in/ahejlsberg

Where to find Ryan:

• Newsletter: developing.dev
• X/Twitter: x.com/ryanlpeterman
• LinkedIn: linkedin.com/in/ryanlpeterman
• Threads: threads.com/@ryanlpeterman
• Instagram: instagram.com/ryanlpeterman
• TikTok: tiktok.com/@ryanlpeterman

Referenced in this episode:

• Flow type checker repository: github.com/facebook/flow
• TypeScript compiler repository: github.com/microsoft/TypeScript
• Algorithms + Data Structures = Programs (book): en.wikipedia.org/wiki/Algorithms_%2B_Data_Stru…
• TypeScript native rewrite: devblogs.microsoft.com/typescript/announcing-t…