@danfrydev

Software engineer in London. TypeScript and AI. VP SWE @jpmorgan @chase_uk

 London
danfry.dev
Joined February 2022
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  • Following1.8K
  • Followers422
I built a Spotify client for the terminal. waxon has vim keys, album art and synced lyrics, and it can play music by itself or drive the Spotify app. Free and open source. Try the demo in your browser 👇
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Replying to @SunWeatherMan
@SunWeatherMan
🤖 Made with AI
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Typo a CSS module class and tsc fails. No codegen, no .d.ts files. typed-css-imports uses content mappers from the TypeScript 7.1 beta, so styles.buttn is an error in your editor and in CI. Completions update as you type in the CSS file. Sass works too. pnpm add -D typed-css-imports [email protected] github.com/danfry1/typed-css…
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building on this: port 65536 is now a compile error. no runtime check, no recursion 🧱
TypeScript code defining a Port type that accepts 1 to 65535, digit by digit, using template literal types. listen(3000) and listen(65535) compile, while listen(65536) and listen(0) are underlined in red as errors.

ALT TypeScript code defining a Port type that accepts 1 to 65535, digit by digit, using template literal types. listen(3000) and listen(65535) compile, while listen(65536) and listen(0) are underlined in red as errors.

Daniel Fry
@danfrydevOct 20
turns out TypeScript types can enforce a min and max string length too
TypeScript code: a Username template literal type built from 3 required one-character placeholders and 5 optional ones, so only strings of 3 to 8 characters are allowed. "dan" and "danfry" compile; "df" (too short) and "danfrydev" (too long) are errors.

ALT TypeScript code: a Username template literal type built from 3 required one-character placeholders and 5 optional ones, so only strings of 3 to 8 characters are allowed. "dan" and "danfry" compile; "df" (too short) and "danfrydev" (too long) are errors.

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turns out TypeScript types can enforce a min and max string length too
TypeScript code: a Username template literal type built from 3 required one-character placeholders and 5 optional ones, so only strings of 3 to 8 characters are allowed. "dan" and "danfry" compile; "df" (too short) and "danfrydev" (too long) are errors.

ALT TypeScript code: a Username template literal type built from 3 required one-character placeholders and 5 optional ones, so only strings of 3 to 8 characters are allowed. "dan" and "danfry" compile; "df" (too short) and "danfrydev" (too long) are errors.

Daniel Fry
@danfrydevSep 27
turns out TypeScript types can enforce an exact string length
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Built an open benchmark off the back of this: 5 typescript checkers, 3 real projects, raw output behind every result Controlled numbers come in under my quick first run. tsc-ts is 4.5x faster than tsgo on type-fest at defaults, 3.4x with both at 10 threads. ts-checker-bench.danfry.dev
Malte Ubl
@cramforceOct 18
TypeScript is 6 times faster than go[*]
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another use: Ethereum addresses vs hashes (the case @MicahZoltu asked for in TypeScript issue #52243). Address = exactly 40 hex chars, Hash = exactly 64, so mixing them up is a compile error. no brands, no runtime code. playground: typescriptlang.org/play/?#co…
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turns out TypeScript types can enforce an exact string length
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love this effect in @opencode
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Built a vim-modal Spotify TUI in Go. Album art rendered with Unicode half-blocks, full vim keybindings, command mode. Powered by @charmcli
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