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← Discriminated unions are the most important TypeScript feature, and everyone should be using them more.
17 connected korrents · 13 moments on record from 6 Nov 2023 to 6 Sept 2026.
Everything filed under TypeScript
TypeScript
Everything filed under Microsoft
Microsoft
Everything filed under software quality
software quality
Everything filed under JavaScript
JavaScript
Everything filed under Python
Python Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Read this korrent: Discriminated unions are the most important TypeScript feature, and everyone should be using them more. Discriminated unions are the most important TypeScript feature, and everyone should be using them more. Last stated 2 years ago
18 Dec 2024
DM
Dillon Mulroy — holds since 2024-12-18 — tap for who they are
Same subject: A programming language is a ten-year play: version one has issues, version two fixes them, version three is finally good — and only then does adoption start. — tap to centre the map on it A programming language is a ten-year play: version one has issues, version two fixes them, version three is finally good — and only then does adoption start. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: A proprietary language licensed from Microsoft had zero chance in the JavaScript ecosystem: TypeScript had to be open source or nobody would come. — tap to centre the map on it A proprietary language licensed from Microsoft had zero chance in the JavaScript ecosystem: TypeScript had to be open source or nobody would come. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: Because its types are erased before the program runs, TypeScript can afford not to be sound: checking 99% beats the 0% JavaScript checked, and buys features a sound language cannot offer. — tap to centre the map on it Because its types are erased before the program runs, TypeScript can afford not to be sound: checking 99% beats the 0% JavaScript checked, and buys features a sound language cannot offer. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: For a TypeScript team, Rust belongs on the backend — API servers — and not in the front end. — tap to centre the map on it For a TypeScript team, Rust belongs on the backend — API servers — and not in the front end. Last stated 4 months ago
20 May 2026
AR
Alice Ryhl — holds since 2026-05-20 — tap for who they are
Same subject: If you can use Effect for TypeScript, you should -- to the point of not starting a new project without it. — tap to centre the map on it If you can use Effect for TypeScript, you should -- to the point of not starting a new project without it. Last stated 2 weeks ago
1 Sept 2026
DM
Dillon Mulroy — holds since 2026-01-09 — tap for who they are
DM
Dillon Mulroy — holds since 2026-09-01 — tap for who they are
Same subject: People adopted TypeScript for the tooling, not the types: an erasable type system is worth having because of the productivity the tooling built on it delivers. — tap to centre the map on it People adopted TypeScript for the tooling, not the types: an erasable type system is worth having because of the productivity the tooling built on it delivers. Last stated 4 months ago
13 May 2026
AH
Anders Hejlsberg — holds since 2026-05-13 — tap for who they are
Same subject: React and TypeScript developers are infantilized by the ecosystem's thought leaders; anything beyond a simple CRUD app will need generics, mapped types and memoization. — tap to centre the map on it React and TypeScript developers are infantilized by the ecosystem's thought leaders; anything beyond a simple CRUD app will need generics, mapped types and memoization. Last stated 3 years ago
6 Nov 2023
DM
Dillon Mulroy — holds since 2023-11-06 — tap for who they are
Same subject: Rust's least mature area is the front end: write the backend in Rust and the front end in TypeScript rather than shipping Rust to the browser through WebAssembly. — tap to centre the map on it Rust's least mature area is the front end: write the backend in Rust and the front end in TypeScript rather than shipping Rust to the browser through WebAssembly. Last stated 4 months ago
20 May 2026
AR
Alice Ryhl — holds since 2026-05-20 — tap for who they are
Same subject: A language can keep changing without a Python-2-to-3 break, as long as code written under the old and the new rules can be mixed freely in one program. — tap to centre the map on it A language can keep changing without a Python-2-to-3 break, as long as code written under the old and the new rules can be mixed freely in one program. Last stated 4 months ago
20 May 2026
AR
Alice Ryhl — holds since 2026-05-20 — tap for who they are
Same subject: Astra writes weird Python slop when one step removed from normal code, and its unit tests are horrific. — tap to centre the map on it Astra writes weird Python slop when one step removed from normal code, and its unit tests are horrific. Last stated 2 weeks ago
6 Sept 2026
AR
Armin Ronacher — holds since 2026-09-06 — tap for who they are
Same subject: Python is ugly: full of superfluous instructions kept since 1987 for legacy reasons, and its __init__ offends the sensibilities to the core. — tap to centre the map on it Python is ugly: full of superfluous instructions kept since 1987 for legacy reasons, and its __init__ offends the sensibilities to the core. Last stated a year ago
12 Jul 2025
DH
David Heinemeier Hansson — holds since 2025-07-12 — tap for who they are
Same subject: A big switch to desktop Linux is coming, at least among developers, because there is enough dissatisfaction with both Apple and Microsoft. — tap to centre the map on it A big switch to desktop Linux is coming, at least among developers, because there is enough dissatisfaction with both Apple and Microsoft. Last stated a year ago
26 Jun 2025
DH
David Heinemeier Hansson — holds since 2025-06-26 — tap for who they are
Same subject: A company that handed its engineers Copilot and thinks it is now moving faster will be destroyed by the people using frontier models. — tap to centre the map on it A company that handed its engineers Copilot and thinks it is now moving faster will be destroyed by the people using frontier models. Last stated 6 months ago
11 Mar 2026
SY
Steve Yegge — holds since 2026-03-11 — tap for who they are
Same subject: A hired chief executive can become the author of a company's culture by giving it a re-founding event, as Satya Nadella and Jamie Dimon did. — tap to centre the map on it A hired chief executive can become the author of a company's culture by giving it a re-founding event, as Satya Nadella and Jamie Dimon did. Last stated 12 months ago
18 Sept 2025
TL
Tobias Lütke — holds since 2025-09-18 — tap for who they are
Same subject: A language-agnostic conformance suite is the most powerful thing you can hand a coding agent, because the whole instruction becomes: write code until these tests pass. — tap to centre the map on it A language-agnostic conformance suite is the most powerful thing you can hand a coding agent, because the whole instruction becomes: write code until these tests pass. Last stated 6 months ago
19 Mar 2026
SW
Simon Willison — holds since 2026-03-19 — tap for who they are
Same subject: A passing test suite is not evidence that the software works, so an agent must also be made to start the thing and exercise it the way a person would. — tap to centre the map on it A passing test suite is not evidence that the software works, so an agent must also be made to start the thing and exercise it the way a person would. Last stated 6 months ago
19 Mar 2026
SW
Simon Willison — holds since 2026-03-19 — tap for who they are
Same subject: A team that slows down and reads every pull request and every line of code should expect only a 30 to 50 percent productivity lift from AI. — tap to centre the map on it A team that slows down and reads every pull request and every line of code should expect only a 30 to 50 percent productivity lift from AI. Last stated 2 months ago
15 Jul 2026
DH
Dex Horthy — holds since 2026-07-15 — tap for who they are
At the centre
Discriminated unions are the most important TypeScript feature, and everyone should be using them more.
Holds Read this korrent →
A programming language is a ten-year play: version one has issues, version two fixes them, version three is finally good — and only then does adoption start.
Holds AH Anders Hejlsberg
A proprietary language licensed from Microsoft had zero chance in the JavaScript ecosystem: TypeScript had to be open source or nobody would come.
Holds AH Anders Hejlsberg
Because its types are erased before the program runs, TypeScript can afford not to be sound: checking 99% beats the 0% JavaScript checked, and buys features a sound language cannot offer.
Holds AH Anders Hejlsberg
For a TypeScript team, Rust belongs on the backend — API servers — and not in the front end.
Holds AR Alice Ryhl
If you can use Effect for TypeScript, you should -- to the point of not starting a new project without it.
Holds
People adopted TypeScript for the tooling, not the types: an erasable type system is worth having because of the productivity the tooling built on it delivers.
Holds AH Anders Hejlsberg
React and TypeScript developers are infantilized by the ecosystem's thought leaders; anything beyond a simple CRUD app will need generics, mapped types and memoization.
Holds
Rust's least mature area is the front end: write the backend in Rust and the front end in TypeScript rather than shipping Rust to the browser through WebAssembly.
Holds AR Alice Ryhl
A language can keep changing without a Python-2-to-3 break, as long as code written under the old and the new rules can be mixed freely in one program.
Holds AR Alice Ryhl
Astra writes weird Python slop when one step removed from normal code, and its unit tests are horrific.
Holds
Python is ugly: full of superfluous instructions kept since 1987 for legacy reasons, and its __init__ offends the sensibilities to the core.
Holds
A big switch to desktop Linux is coming, at least among developers, because there is enough dissatisfaction with both Apple and Microsoft.
Holds
A company that handed its engineers Copilot and thinks it is now moving faster will be destroyed by the people using frontier models.
Holds SY Steve Yegge
A hired chief executive can become the author of a company's culture by giving it a re-founding event, as Satya Nadella and Jamie Dimon did.
Holds
A language-agnostic conformance suite is the most powerful thing you can hand a coding agent, because the whole instruction becomes: write code until these tests pass.
Holds
A passing test suite is not evidence that the software works, so an agent must also be made to start the thing and exercise it the way a person would.
Holds
A team that slows down and reads every pull request and every line of code should expect only a 30 to 50 percent productivity lift from AI.
Holds DH Dex Horthy