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Both playlist detail views rendered every track with a plain `.map()`. Measured at 2 000 tracks: 22 090 elements in the shadow root and 2 000 eager <img>, against 487 and 0 after, with retained heap 5.85 MB -> 0.81 MB and one update pass 5.3 ms -> 0.1 ms. They are virtualized in place rather than rendered through <track-list>, which is what the audit suggested: that works for `genre-details` because a genre list is just tracks, but both playlist views render phantom rows for missing files and `playlist-details` is a drag source and a drop target, and `track-list` has never had either. Virtualizing in place gets the same 45x on the number that matters with none of that risk, and leaves `track-list` alone for its four other callers. Both therefore push `virtualizer.requestUpdate()` on a selection change and on a playing-track change: the virtualize directive runs when one of the *virtualizer's own* properties changes, not when its parent re-renders, so memoising `items` and hoisting `renderItem` together is how you build a list that never repaints. Selection went silently dead the first time, with the controller holding exactly the right keys. And a closed queue panel renders no list at all: `width: 0` and `contain` bounded the damage without stopping the virtualizer inside from measuring its window on every queue change, or `scrollToIndex` from calling `scrollIntoView()` on something invisible.
YellowJacket Frontend
This directory contains the frontend for YellowJacket.
Dependencies
There are a couple of tools that are required to build and use the frontend.
vitefor- transpiling typescript
- bundling the final "package" that is useb by the webview
- running a dev server with hot-reloading
- configured with the
vite.config.tsfile in this directory
pnpmfor managing frontend dependency packages
There are a handful of dependency packages that we use directly in the frontend.
picocssfor basic CSS while developinglitfor a simple but powerful wrapper around Web Components
Lastly, there are some dependencies that only benefit development
tsservercomes bundled with vscode and can be used as an LSP with other editors usingtypescript-language-server- Used for autocomplete, syntax highlighting, etc.
- This can be configured with the
tsconfig.jsonfile in the root of the project- NOTE: your configuration should align with the
viteconfig so you get in-editor feedback that aligns with how the build will be done.
- NOTE: your configuration should align with the
Development
Ideally, you would use the frontend in the wails app as the frontend depends on the Go bindings generated by Wails.
You can do this by running wails dev in the root of the YellowJacket repo.
If you want to run the frontend standalone, make sure the Wails go bindings have been generated with wails generate modules.
Then, you can run pnpm dev to run the vite dev server.
For more information on what commands are available, refer to package.json.
Code
Web Components
Our frontend is based off of Web Components, a standard that provides native browser encapsulation of components that can include HTML, CSS and Javascript all together.
Instead of writing these components manually in Javascript, we utilize lit as a wrapper library.
Typescript
To better integrate with our tooling and to provide a better developer experience with strong typing, we have written all functional frontend code in Typescript. Vite serves as our Typescript transpiler.
Important Files and Directories
NOTE: most of these directories have aliases defined in tsconfig.json and vite.config.ts so that we may refer to them by shorthand when importing.
index.htmlandindex.jsis the entrypoint for the frontend. The first page that loads.wailsjs/goGo code bindings generated by wails reside herewailsjs/runtimethe Wails runtime code needed to use Wails featuressrcall app code resides heresrc/assetsstatic assets like fonts, images and iconssrc/componentslit components that are used to compose the applicationsrc/pagespages that serve as other entrypoints for the application that can be navigated to