---
id: 02-migrate-feature-binders
epic: binder-wrap-helper
title: Migrate all five feature binders to wireUseCase
type: technical-story
status: done
feature: auth, blog, media, marketing-pages, navigation
depends-on: [01-wire-use-case-helper]
blocks: []
created: 2026-05-13T19:17:10+02:00
updated: 2026-05-14T19:16:52.691Z
---

## Goal

Replace every inline `withSpan + withCapture (+ withAudit)` block in each feature's `bind-production.ts` and `bind-dev-seed.ts` with a call to `wireUseCase`. Existing binder-level and integration tests must continue to pass unchanged. Each feature migrates in its own commit.

## Why

The five inline wrapping clone groups are the top source of duplication reported by `pnpm fallow`. Moving to `wireUseCase` eliminates all five clone groups and leaves each binder as decision content only (which adapter, which mode, which symbol).

## Done when

- All 10 binder files (`auth ×2`, `blog ×2`, `media ×2`, `marketing-pages ×2`, `navigation ×2`) call `wireUseCase` for every use case binding; no inline `withSpan + withCapture` blocks remain for use cases.
- `assertFeatureConformance` at the tail of each `bind-production.ts` continues to accept all wired use cases (brands present, manifest entries match).
- `pnpm typecheck && pnpm test && pnpm lint && pnpm conformance && pnpm fallow:audit && pnpm coverage:diff` pass after each per-feature commit.
- `pnpm fallow dupes` no longer shows the five binder-pair clone groups in its output.

## In scope

- `packages/auth/src/di/bind-production.ts` + `bind-dev-seed.ts` — 3 use cases (signIn, signUp, signOut).
- `packages/blog/src/di/bind-production.ts` + `bind-dev-seed.ts` — 3 use cases (getArticles, getArticleBySlug, createArticle).
- `packages/media/src/di/bind-production.ts` + `bind-dev-seed.ts` — 3 use cases (getMedia, listMedia, deleteMedia).
- `packages/marketing-pages/src/di/bind-production.ts` + `bind-dev-seed.ts` — 2 use cases (getPageBySlug, getSiteSettings).
- `packages/navigation/src/di/bind-production.ts` + `bind-dev-seed.ts` — 1 use case (getHeader).
- If any binder's existing tests assert on internal wrapping shape rather than observable behaviour, refactor those assertions to test through the helper's contract (same commit as the binder change).

## Out of scope

- Controller bindings — covered by the helper per the PRD but deferred to a follow-up if scope is a concern.
- Repository and service bindings — stay as direct `.toConstantValue()` calls.
- Apps' `bindAll()` dispatcher — untouched.

## Tasks

- [x] Migrate `auth` binders (`bind-production.ts` + `bind-dev-seed.ts`) to `wireUseCase` for all 3 use cases (signIn, signUp, signOut); all gates pass on this commit.
- [x] Migrate `blog` binders to `wireUseCase` for all 3 use cases (getArticles, getArticleBySlug, createArticle); all gates pass on this commit.
- [x] Migrate `media` binders to `wireUseCase` for all 3 use cases (getMedia, listMedia, deleteMedia); all gates pass on this commit.
- [x] Migrate `marketing-pages` binders to `wireUseCase` for both use cases (getPageBySlug, getSiteSettings); all gates pass on this commit.
- [x] Migrate `navigation` binders to `wireUseCase` for the single use case (getHeader); all gates pass on this commit; verify `pnpm fallow dupes` no longer surfaces the five binder-pair clone groups.