Phase A continuation of the ProviderShared dedupe pass. Three more
patterns lifted into ProviderShared so they're written once:
ProviderShared.invalidRequest(message) — replaces six identical
`const invalid = (message) => new InvalidRequestError({ message })`
one-liners across openai-chat, openai-responses, anthropic-messages,
gemini, openai-compatible-chat, and bedrock-converse. Each adapter
keeps a short `const invalid = ProviderShared.invalidRequest` alias
so the 27 callsite `yield* invalid("...")` patterns are unchanged.
Bedrock's SigV4 catch path and the openai-compatible-chat baseURL
guard both go through the helper now too.
ProviderShared.validateWith(decode) — replaces the identical
`(draft) => decode(draft).pipe(Effect.mapError((e) =>
invalid(e.message)))` lambda body in five adapters. Same line count
but shorter, names the pattern, and keeps the `decode → mapError →
InvalidRequestError` translation in one canonical spot.
ProviderShared.jsonPost({ url, body, headers }) — replaces the
five-adapter pattern of `HttpClientRequest.post(url).pipe(setHeaders,
bodyText)` for JSON-body POSTs. Sets `content-type: application/json`
last so caller headers can override everything except the
content-type. Bedrock uses it for both the bearer-auth and SigV4-
signed paths; SigV4 still signs against `baseHeaders` (which already
contained content-type) so the signature matches what the helper
ultimately sends.
Net change: -73 / +86 (+13 in shared.ts mostly JSDoc; -86 across the
six adapters). The `HttpClientRequest` and `InvalidRequestError`
imports are dropped from the five SSE adapters and from Bedrock since
they're no longer referenced directly.
Verified: `bun typecheck` clean, 106 pass / 0 fail / 0 skip
(unchanged).
Kit Langton
c69f2bb15e