[sxlijin]

Summary

• replace the process-wide bridge_cffi runtime singleton with a keyed runtime registry on native and WASM targets
• return runtime keys from initialization and route calls through the selected runtime across Python, TypeScript, Web, and the C ABI
• reserve runtime key 0 for generated SDK initialization and generated function calls while dynamically allocating independent nonzero keys
• update C++, C#, Go, Java, Rust, and Swift CFFI consumers for the expanded ABI
• add Python and TypeScript SDK regression coverage proving multiple runtime instances remain independent

Why

The singleton bridge made dynamically constructed BAML runtimes overwrite one another. Runtime handles now carry a stable u32 registry key, allowing calls to remain bound to the runtime instance that created them while generated SDKs continue using the well-known key 0.

Validation

• cargo check --workspace
• cargo test -p bridge_cffi
• cargo test -p sdkgen_python_pydantic2 -p sdkgen_typescript_shared
• cargo check -p bridge_cffi -p bridge_typescript_web --target wasm32-unknown-unknown
• Python SDK function_calls::pytest
• TypeScript Node SDK function_calls::vitest_node
• TypeScript Web browser and Workers function-call suites
• pnpm build:debug for bridge_typescript
• go test ./... for sdks/go/baml_go
• C ABI fixture compilation with warnings treated as errors

C# validation was unavailable because dotnet is not installed in the development environment. Swift tests require the local BamlBridgeFFI.xcframework binary artifact, which is not present.

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[github-actions]

⏭️ Performance benchmarks were skipped

Perf benchmarks (CodSpeed) are opt-in on pull requests — they no longer run on every push. They always run automatically after merge to canary/main.

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[github-actions]

Binary size checks passed

✅ 7 passed

	Artifact	Platform	File	Gzip	Gated on	Baseline	Delta	Status
✅	baml-cli	Linux	🔒 27.3 MB	11.6 MB	file	27.3 MB	+4.4 KB (+0.0%)	OK
✅	packed-program	Linux	🔒 17.7 MB	7.3 MB	file	17.7 MB	+4.1 KB (+0.0%)	OK
✅	baml-cli	macOS	🔒 21.2 MB	10.1 MB	file	21.2 MB	+16 B (+0.0%)	OK
✅	packed-program	macOS	🔒 13.8 MB	6.4 MB	file	13.8 MB	+0 B (+0.0%)	OK
✅	baml-cli	Windows	🔒 22.8 MB	10.3 MB	file	22.8 MB	+4.6 KB (+0.0%)	OK
✅	packed-program	Windows	🔒 14.7 MB	6.5 MB	file	14.7 MB	+7.2 KB (+0.0%)	OK
✅	bridge_wasm	WASM	16.5 MB	🔒 4.5 MB	gzip	4.5 MB	+1.6 KB (+0.0%)	OK

🔒 = the size this artifact is GATED on (ceiling + delta). Binaries gate on file size (installed binary); WASM gates on gzip (download size). The other size is shown for information only.

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Generated by cargo size-gate · workflow run

[sxlijin]

Superseded by #4754, which implements uint64 registrations for distinct generated SDKs and independent dynamic runtimes, with Python and TypeScript coexistence regressions.