trx-rs/docs/ts-migration-baseline.md

TypeScript migration baseline

This baseline records the browser architecture at the start of the migration. It is intentionally historical; generated output sizes are tracked separately by the deterministic frontend build.

Startup order

The initial document loads these scripts in order:

1. /vendor/opus-decoder-0.7.11.min.js
2. /vendor/leaflet.js
3. /leaflet-ais-tracksymbol.js
4. /webgl-renderer.js
5. /ui-core.js
6. /app.js

Decoder and feature scripts are then loaded lazily by the inline loader in index.html. The frontend smoke test locks the core ordering and rejects remote script or stylesheet URLs.

Source measurements

At baseline, first-party JavaScript comprised 23 files and approximately 776 KiB. The largest sources were:

Source	Bytes
app.js	337,111
map-core.js	131,899
plugins/scheduler.js	60,883
plugins/bookmarks.js	30,543
plugins/sat.js	22,541
plugins/vchan.js	20,195
webgl-renderer.js	18,993

The migrated source snapshot contained 123 distinct direct window.* assignments. These are compatibility callbacks, shared state, and plugin entry points. New TypeScript code must not add to that set; the typed plugin registry and explicit services replace it over the course of the migration.

All production scripts, stylesheets, fonts, icons, and map assets were already served from local embedded routes. The automated startup test ensures no remote runtime script or stylesheet dependency is introduced.