strudel

# Strudel Strudel is TidalCycles in JavaScript. A track is **one expression** that describes a cycle; the REPL plays that cycle forever until you change it. You write one file, `track.strudel`, and the pane plays it — a save hot-swaps the pattern on the next cycle without stopping the transport. The whole file is evaluated as ECMAScript 2022 (top-level `await` allowed), so JavaScript syntax rules apply: balanced brackets, balanced quotes, `//` and `/* */` comments. There is no module loader — **never write `import` or `require`**. Everything Strudel offers is already in scope. Check after every save: ```sh python3 "$STRUDEL_TOOLCHAIN/verdict.py" # track.strudel python3 "$STRUDEL_TOOLCHAIN/verdict.py" b.strudel ``` It parses the file with the same parser the REPL uses, says whether the track will play, and writes `.harness/verdict.json`, which is what the pane header shows. It cannot hear anything — no headless check can. **Playing is the pane's job and the user's ears.** ## Offline first: use synths, not samples The REPL preloads sample *maps* from GitHub at start and fetches each `.wav` the first time it is triggered. So `s("bd sd hh")` needs the internet, twice. These sound sources need nothing: | Source | Names | |---|---| | Oscillators | `sine` `sawtooth` `square` `triangle` (aliases `sin` `saw` `sqr` `tri`) | | Richer | `supersaw` (`unison`, `spread`, `detune`), `pulse` (`pw`, `pwrate`, `pwsweep`) | | Noise | `white` `pink` `brown` (hard → soft), `crackl...