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fix(anthropic): accept stable and beta SDK events - #99
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Kinfe123
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Oct 30, 2026
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lgtm, stable and beta anthropic streams typecheck directly.
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Problem
With streamfold 0.1.14 and @anthropic-ai/sdk 1.3.0, passing
client.messages.create({ model, messages, max_tokens, stream: true })toreadStructured(events, { integration: anthropic })fails TypeScript compilation. The beta message stream and manual push methods fail the same way.Root cause
The adapter's fallback event shape requires a string index signature. Anthropic declares its events as interfaces without that signature, so non-tool block starts cannot satisfy the union even though the runtime ignores them.
Change
Accept a discriminator-only fallback alongside the existing event shapes. Preserve the existing index-signature branch for raw provider event literals with extra fields. No runtime behavior changes or SDK runtime dependencies are introduced.
Verification
readStructured, both manual push methods, and an unknown raw event literal.pnpm typecheckfails before the declaration change with TS2322/TS2345 on both SDK stream surfaces and passes afterward.pnpm release:checkpasses: 197 JavaScript tests, 11 Rust tests, type/syntax checks, WASM build, formatting, Clippy, and package checks.Public surface
Widens
AnthropicToolInputEventwithout removing an existing shape. Updates API documentation and the unreleased changelog. The SDK is a development-only dependency for the consumer type check.