fix: inject WASM ONNX runtime for Bun to prevent NAPI fatal crash

[Suknna]

Problem

opencode crashes with NAPI FATAL ERROR: Error::New napi_create_error when @cortexkit/opencode-magic-context is enabled on macOS arm64 (issue #95). The crash is triggered by onnxruntime-node (native N-API addon) hitting an incomplete N-API code path in Bun.

Root cause

@huggingface/transformers@4.x statically imports onnxruntime-node. Under Bun, the native N-API binding calls napi_create_error which triggers Bun's fatal panic, crashing the entire host process. The crash is intermittent (happens "after running for a while") and depends on specific N-API error paths.

Fix

Extend the existing WASM ONNX injection (injectWasmOrtForElectron, added for issue #78) to also activate under Bun. Both runtimes now get onnxruntime-web (WASM backend) instead of the native onnxruntime-node, while plain Node continues using the faster native backend.

Detection: process.versions.bun (Bun) || process.versions.electron (Electron) → inject WASM. Neither set (plain Node) → no-op.

Verification

• ✅ onnxruntime-web loads and runs inference under Bun
• ✅ Symbol.for("onnxruntime") injection makes transformers.js use WASM backend
• ✅ Concurrent model loading works (5 parallel sessions)
• ✅ TypeScript typecheck passes
• ✅ Lint passes
• ✅ Build passes

Trade-off

WASM backend is slower than native CPU, but it's the only reliable path under Bun. The native onnxruntime-node cannot safely load due to Bun's N-API limitations.

Closes #95

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Summary by cubic

Switch Bun and Electron to onnxruntime-web (WASM) for embeddings to avoid onnxruntime-node N-API crashes. Plain Node keeps the native backend; closes #95.

• Bug Fixes
  • Injects WASM via Symbol.for("onnxruntime") when process.versions.bun or process.versions.electron is set; no-op on plain Node.
  • Prevents Bun panic (NAPI FATAL ERROR: Error::New napi_create_error) and Electron native load issues; falls back to native if injection fails.

^{Written for commit 2f58845. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

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