feat(typescript): generate SDKs across worker shards - #17161
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Adds worker-based sharding for TypeScript SDK generation. The core sharding logic, merge routine, and orchestration are reasonable, but there are a few correctness concerns: the validation error message wording doesn't match the tests, a potential unhandled rejection in the CLI entrypoint, and the merge's aggregate-variant single-source shortcut could still leave unmerged content.
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Summary
Add internal worker sharding for TypeScript SDK generation and merge each worker's output into one SDK.
Benchmark
Cloudflare's canonical TypeScript IR, three alternating runs:
Both modes generated 22,573 files. After the workflow's formatting step, there were zero normalized content differences.
Testing