fix(swift): align snippet initializer with generated wrapper struct

[devin-ai-integration]

Description

Linear ticket: Closes FER-10087

The Swift dynamic-snippet generator emitted .init(body: <SomeRequest>(...)) on the generated request wrapper struct, but the Swift SDK only accepts the referenced type directly as a method parameter — no wrapper struct with an init(body:) is generated. This caused compiled snippet failures for any spec with a body that $refs a top-level schema.

Design choice: Option (b) from the ticket — changed the snippet generator to construct the inner request directly and pass it to the method. This is more idiomatic Swift because the SDK already accepts the referenced type directly (e.g. request: CreateUsernameBody(...) instead of request: .init(body: CreateUsernameBody(...))). Adding an unnecessary wrapper struct would add complexity without benefit.

Changes Made

• Modified generators/swift/dynamic-snippets/src/EndpointSnippetGenerator.ts: When an inlined request body is of type "referenced", the snippet now passes the type literal directly to the request: parameter instead of wrapping it in .init(body:).
• Updated seed fixture outputs across 8 affected fixtures (request-parameters, exhaustive, bytes-upload, trace, path-parameters, nullable-request-body, schemaless-request-body-examples) to reflect the corrected snippets.
• Added changelog entry at generators/swift/sdk/changes/unreleased/fix-snippet-referenced-body.yml.

The existing request-parameters seed fixture already exercises the exact scenario (endpoint createUsernameWithReferencedType with a $ref body + query params).

Testing

• TypeScript compilation passes (tsc)
• Swift dynamic snippet unit tests pass (32/32)
• Full swift-sdk seed test suite passes (126/127 — 1 expected failure on literal fixture)
• No regressions in any existing Swift seed snapshot
• pnpm lint:biome, pnpm format, pnpm check all pass

Link to Devin session: https://app.devin.ai/sessions/7ed05d4d38b74b6e811599106d1f344d

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SDK Generation Benchmark Results

Comparing PR branch against median of 5 nightly run(s) on main (latest: 2026-04-23T04:59:11Z).

Full benchmark table (click to expand)

Generator	Spec	main (generator)	main (E2E)	PR (generator)	Delta
swift-sdk	square	41s (n=5)	290s (n=5)	42s	+1s (+2.4%)

main (generator): generator-only time via --skip-scripts (includes Docker image build, container startup, IR parsing, and code generation — this is the same Docker-based flow customers use via fern generate). main (E2E): full customer-observable time including build/test scripts (nightly baseline, informational). Delta is computed against generator-only baseline.
⚠️ = generation exited with a non-zero exit code (timing may not reflect a successful run).
Baseline from nightly runs on main (latest: 2026-04-23T04:59:11Z). Trigger benchmark-baseline to refresh.
Last updated: 2026-04-25 15:58 UTC