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Optional static type-checking for JavaScript.

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Our copy audit read 56,462 words and found no exclamation marks. The 161 strings it could not see have two.

Our copy audit read 56,462 words and found no exclamation marks. The 161 strings it could not see have two.

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6 min read
Validating Chinese Business License Codes (USCC) in TypeScript

Validating Chinese Business License Codes (USCC) in TypeScript

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4 min read
Our test suite has no DOM: 266 tests in 603 milliseconds, and the two components it checks are rendered to a string

Our test suite has no DOM: 266 tests in 603 milliseconds, and the two components it checks are rendered to a string

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6 min read
The only string in our alert email that nobody on our side wrote, and the four characters standing in front of it

The only string in our alert email that nobody on our side wrote, and the four characters standing in front of it

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6 min read
What the Gamepad API actually tells you about stick drift (with a working verdict

What the Gamepad API actually tells you about stick drift (with a working verdict

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3 min read
An AI agent read a Japanese novel as 208,953 replacement characters

An AI agent read a Japanese novel as 208,953 replacement characters

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3 min read
Our workspace runs 1,129 tests and the app people actually hold has 67 of them

Our workspace runs 1,129 tests and the app people actually hold has 67 of them

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7 min read
Twelve links chosen alphabetically on all 461 of our generated pages, and the 128 pages nothing else points to

Twelve links chosen alphabetically on all 461 of our generated pages, and the 128 pages nothing else points to

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6 min read
Building hldays #6: Names are harder than dates

Building hldays #6: Names are harder than dates

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7 min read
tanstack-fetch 2.0.0: A Smaller Core, WebSockets, WebTransport, and Type-Safe Streams

tanstack-fetch 2.0.0: A Smaller Core, WebSockets, WebTransport, and Type-Safe Streams

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6 min read
Type-safe, scalable WebSockets in Python: a FastAPI tutorial

Type-safe, scalable WebSockets in Python: a FastAPI tutorial

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9 min read
How we deliver voice only to people nearby in a 2D virtual office (SFU subscription permissions, not mixing)

How we deliver voice only to people nearby in a 2D virtual office (SFU subscription permissions, not mixing)

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7 min read
Prompt Caching: Your Prompt's Prefix Is a Cache Key

Prompt Caching: Your Prompt's Prefix Is a Cache Key

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4 min read
The browser doesn't trust the server: a Solana frontend that checks its own backend

The browser doesn't trust the server: a Solana frontend that checks its own backend

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10 min read
What Gemma 4 vision gets right about circuit sketches, and the validator that fixes the rest

What Gemma 4 vision gets right about circuit sketches, and the validator that fixes the rest

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6 min read
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