CLAUDE.md@deno/core/dsl/operation/oas git:20260515.f0453aeA

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# core/dsl/operation/oas — directory guide

This directory contains the OAS-operation half of the projection
machinery. Files:

- `OasOperationProjectionBase.ts` — runtime base class. Subclasses
  extend it. Carries `settings: ContentSettings<E>` (including
  `settings.variant`) and `generatorKey`.
- `toOasOperationProjectionBase.ts` — factory. Builds a class with
  static `toIdentifier` / `toExportPath` / `toEnrichments` /
  `isSupported` / `id` / `type`. The constructor reads
  `args.settings.variant` and threads it into the
  `toOasOperationGeneratorKey` call so the resulting Definition's
  `generatorKey` carries the variant.
- `toOasOperationEntry.ts` — pipeline-side factory. Wraps user's
  `isSupported` / `transform` etc. in a config object. The
  `isSupported` wrapper does its own enrichment-path walk via
  `lodash-es/get(..., \`enrichments.${id}.${path}.${method}.${variant}\`)`
  before calling the user's predicate.
- `OasOperationDriver.ts` — the insertion lifecycle (compose
  `ContentSettings`, look up via `findDefinition`, integrity-check
  via `affirmDefinition`, register the Definition, register the
  import). Variant-related entry points:
  - Constructor takes a `variant: string` arg and stores it on the
    instance.
  - `assertPeerVariantExists` runs before `toOperationContentSettings`
    — throws if the caller asked for a non-`'main'` variant the peer
    doesn't declare.
  - `affirmDefinition` builds the call's `generatorKey` with variant
    in the 4th segment; the cache key uniqueness invariant is
    enforced here.
- `types.ts` — arg shapes. Every `To*Args` and `Transform*Args`
  carries `variant: string`.

**Variants-aware vs unaware:**

- *Unaware*: destructure `variant` in `toExportPath` (since the body
  calls `this.toIdentifier({…, variant})`), ignore it in
  `toIdentifier`. Engine still dispatches with `variant: 'main'` for
  every operation.
- *Aware*: `toIdentifier` folds variant into the name via
  `withVariant(base, variant)` from `@/helpers/withVariant.ts`.
  `toExportPath` inherits the suffix through the
  `this.toIdentifier({…, variant})` call.

Tests pinning variant invariants: `OasOperationDriver.test.ts` →
"Variant validation"; cross-package tests in `core/context/`.

Concept doc: `docs/concepts/variants.md`. Skill: `docs/skills/skmtc-generator/SKILL.md`.

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# Recent Activity

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### May 6, 2026

| ID | Time | T | Title | Read |
|----|------|---|-------|------|
| #19181 | 9:27 PM | 🔵 | Generator registration architecture separates artifact definitions from import statements | ~461 |

### May 11, 2026

| ID | Time | T | Title | Read |
|----|------|---|-------|------|
| #20459 | 7:04 PM | 🔄 | OasOperationDriver simplified using Identifier.toImport pattern | ~540 |
| #20457 | " | 🔄 | Completed task 3 updating driver implementations | ~373 |
| #20430 | 7:01 PM | ⚖️ | Add toImport method to Identifier class for consistent ImportNameArg construction | ~494 |
| #20428 | 7:00 PM | 🔵 | OasOperationDriver automatically registers imports with isType flag based on identifier entity type | ~537 |
| #20419 | 6:59 PM | 🔵 | isType flag implementation across core DSL import system | ~592 |

### May 12, 2026

| ID | Time | T | Title | Read |
|----|------|---|-------|------|
| #20928 | 2:20 PM | 🔵 | Critical enrichment routing path discrepancy discovered in documentation | ~940 |
| #20654 | 8:47 AM | 🔵 | SKMTC driver pattern for projection lifecycle and definition caching | ~680 |
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