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b50a5c9ac7
Two issues hit while loading Gemma 4 E2B in /llm-test for the first
time on a local dev server.
1. CSP script-src blocked cdn.jsdelivr.net.
@huggingface/transformers v4 lazy-loads the onnxruntime-web WASM
loader shim via a runtime dynamic `import()` from
cdn.jsdelivr.net/npm/onnxruntime-web@... at backend selection time
(the package itself is bundled, but the WASM-loader is fetched on
demand so the static bundle stays small). With the previous CSP the
import was blocked and "no available backend found" was the only
downstream error. Allowlist cdn.jsdelivr.net in the shared CSP
script-src so every Mana web app picks this up automatically.
2. Loading bar oscillated wildly during the model download.
transformers.js downloads many shards in parallel (config.json,
tokenizer.json, generation_config.json, model.onnx, model_data.bin,
…) and fires the progress callback per file. The previous engine
code reported the latest event verbatim, so the bar bounced
between whichever file happened to be progressing fastest.
Replace per-file reporting with a Map<file, {loaded, total}>
accumulator and emit an aggregated total on every event. The
denominator can grow as new files are discovered (causing brief
small dips), but both numerator and denominator are individually
monotonic, so the aggregate is much smoother. Also include a
human-readable byte count and file count in the status text:
Downloading model (47%, 240 MB / 510 MB, 8 files)
Pin completed files to 100% on the 'done' event so the final
aggregate visibly hits 100% before the loading→ready transition.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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