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A list pays per row, and only while scrolling — and none of this is visible to any test tier: nothing renders differently and nothing fails, the app is just slower. - The track list's Art column rendered `CoverArtPath`, the original artwork, into a 24 px box while `CoverArtSmall` sat unused on the same model, with no `loading="lazy"`. 26 of 26 image requests asked for the full-size tier; now 0. - `artists-view`'s avatar fallback linear-scanned every cached album per card per frame, lowercasing two strings per comparison, inside the virtualizer's renderItem — the common case, since a locally tagged library has no artist images at all. Measured at 5 000 albums and 24 visible cards: 1.46 ms/frame -> 0.01 ms/frame. - Five components resolved selected file paths back to tracks with `tracks.find(...)`; they share `utils/track-index.ts` now. "Select all -> Edit tags" at 50 000 tracks: 3 051-6 298 ms -> 68 ms. - "Play this artist", "play these albums" and the album drag cache resolve paths in one call instead of one per album. - The column-resize drag registers its document listeners on mousedown. Two things here are load-bearing and read as sloppiness. The per-render arrow functions in `artists-view` and `genres-view` are the *only* thing changing a property of their virtualizer on a host update, and therefore the only thing repainting the cards: hoisting them to stable fields takes a selection from 1 highlighted card to 0. And a row inside a virtualizer needs `width: 100%`, because the virtualizer positions its children absolutely and a grid row otherwise shrinks to fit its content and stops lining up with the header above it.
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