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+# Library Modernization Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Modernize runtime and development dependencies while preserving Discord monitoring, recording, database migration, dashboard, and test behavior.
+
+**Architecture:** Treat modernization as dependency classification plus small source refactors. Remove redundant validation libraries by moving `src/validation.ts` to Zod, replace `fluent-ffmpeg` with a tiny direct `ffmpeg` process wrapper for the muxer scripts, and convert database migration code to ESM-safe imports. Keep high-risk Discord/audio/native packages unless audit proves a safe replacement exists.
+
+**Tech Stack:** Node.js, pnpm, TypeScript, Zod, Drizzle ORM, better-sqlite3, pg, Express, ws, Vite, React, Vitest, Biome, Discord voice/audio packages.
+
+---
+
+## Dependency Audit Baseline
+
+- Usage audit confirms `class-transformer`/`class-validator` are only used by `src/validation.ts`.
+- Usage audit confirms `fluent-ffmpeg` is only used by `src/muxer.ts` and `src/muxer-aup3.ts`.
+- `pnpm outdated --format table` reports `discord.js-selfbot-v13` and `fluent-ffmpeg` as deprecated.
+- Outdated packages reported: `tsx`, `@types/node`, `p-retry`, `pino`, `pino-pretty`, `sodium-native`.
+- Direct dependency classification: remove `class-transformer`, `class-validator`, `fluent-ffmpeg`, `@types/fluent-ffmpeg`; replace validation with Zod and ffmpeg wrapper with `node:child_process`; upgrade outdated packages; keep high-risk voice/audio packages unless a compatible replacement is proven.
+
+## File Structure
+
+- Modify `package.json`: dependency upgrades, removals, and script additions if needed.
+- Modify `pnpm-lock.yaml`: regenerated by `pnpm install`.
+- Modify `src/validation.ts`: replace `class-transformer` and `class-validator` with Zod.
+- Modify `src/database/migrate.ts`: remove dynamic CommonJS `require` and `any` cast.
+- Create `src/audio/ffmpegProcess.ts`: small wrapper around `node:child_process` for direct ffmpeg execution.
+- Modify `src/muxer.ts`: use `runFfmpeg()` instead of `fluent-ffmpeg`.
+- Modify `src/muxer-aup3.ts`: use `runFfmpeg()` instead of `fluent-ffmpeg`.
+- Modify `src/recorder/decoder.ts`: keep `createRequire()` for optional native probing unless a better ESM-safe probe is identified during implementation.
+- Add or modify tests under `tests/`: validation, migration helper behavior, and ffmpeg argument construction.
+
+---
+
+### Task 1: Capture Dependency Audit Baseline
+
+**Files:**
+- Modify: `docs/superpowers/plans/2026-05-14-library-modernization.md`
+- Inspect: `package.json`
+- Inspect: `pnpm-lock.yaml`
+- Inspect: `src/**/*.ts`
+- Inspect: `tests/**/*.ts`
+
+- [x] **Step 1: List direct dependency usage**
+
+Run:
+
+```bash
+grep -R "class-transformer\|class-validator\|fluent-ffmpeg\|@discordjs/opus\|@discordjs/voice\|@snazzah/davey\|discord.js-selfbot-v13\|libsodium-wrappers\|sodium-native\|prism-media\|drizzle-orm\|better-sqlite3\|pg\|express\|helmet\|p-retry\|pino\|pino-http\|prom-client\|react\|react-dom\|vite\|ws\|zod" -n src tests frontend package.json
+```
+
+Expected: output lists every direct package usage. Record the summary in the implementation notes during execution.
+
+- [x] **Step 2: Check outdated dependencies**
+
+Run:
+
+```bash
+pnpm outdated --format table
+```
+
+Expected: command exits non-zero if packages are outdated; use the table as audit input, not as failure.
+
+- [x] **Step 3: Classify direct dependencies**
+
+Use this classification as the starting point, adjusting only if Step 1 proves a package is unused or irreplaceable:
+
+```text
+remove: class-transformer, class-validator, fluent-ffmpeg, @types/fluent-ffmpeg
+replace: class-transformer/class-validator -> zod; fluent-ffmpeg -> node:child_process ffmpeg wrapper
+upgrade: @vitejs/plugin-react, better-sqlite3, discord.js-selfbot-v13, dotenv, drizzle-orm, express, helmet, libsodium-wrappers, p-retry, pg, pino, pino-http, prom-client, react, react-dom, sodium-native, vite, ws, zod, @biomejs/biome, @types/*, drizzle-kit, pino-pretty, tsx, vitest
+keep unless compatible alternative is proven: @discordjs/opus, @discordjs/voice, @snazzah/davey, prism-media
+```
+
+- [x] **Step 4: Commit audit note if this task changes files**
+
+If only commands were run, do not commit. If the plan is updated with audit notes, run:
+
+```bash
+git add docs/superpowers/plans/2026-05-14-library-modernization.md
+git commit -m "docs: record dependency modernization audit"
+```
+
+Expected: commit succeeds only if a file changed.
+
+---
+
+### Task 2: Replace Class Validator Stack With Zod
+
+**Files:**
+- Modify: `src/validation.ts`
+- Test: `tests/validation.test.ts`
+- Modify later: `package.json`
+
+- [ ] **Step 1: Write failing validation tests**
+- [ ] **Step 2: Run validation tests to establish baseline**
+- [ ] **Step 3: Replace implementation with Zod**
+- [ ] **Step 4: Run validation tests**
+- [ ] **Step 5: Commit validation refactor**
+
+---
+
+### Task 3: Convert Migration Code to ESM-Safe Drizzle Imports
+
+**Files:**
+- Modify: `src/database/migrate.ts`
+- Test: `tests/database/migrate.test.ts`
+
+- [ ] **Step 1: Extract SQLite database creation for testing**
+- [ ] **Step 2: Add migration helper test**
+- [ ] **Step 3: Run migration test**
+- [ ] **Step 4: Run typecheck for migration typing**
+- [ ] **Step 5: Commit migration refactor**
+
+---
+
+### Task 4: Replace Fluent FFmpeg With Direct Process Wrapper
+
+**Files:**
+- Create: `src/audio/ffmpegProcess.ts`
+- Modify: `src/muxer.ts`
+- Modify: `src/muxer-aup3.ts`
+- Test: `tests/audio/ffmpegProcess.test.ts`
+
+- [ ] **Step 1: Add ffmpeg wrapper tests**
+- [ ] **Step 2: Run ffmpeg wrapper test to verify it fails**
+- [ ] **Step 3: Implement ffmpeg process wrapper**
+- [ ] **Step 4: Refactor `src/muxer.ts`**
+- [ ] **Step 5: Refactor `src/muxer-aup3.ts`**
+- [ ] **Step 6: Run ffmpeg wrapper tests**
+- [ ] **Step 7: Run typecheck**
+- [ ] **Step 8: Commit ffmpeg refactor**
+
+---
+
+### Task 5: Update Package Manifest and Lockfile
+
+**Files:**
+- Modify: `package.json`
+- Modify: `pnpm-lock.yaml`
+
+- [ ] **Step 1: Remove replaced packages**
+- [ ] **Step 2: Upgrade dependencies interactively-free**
+- [ ] **Step 3: Ensure package manager remains pnpm 10**
+- [ ] **Step 4: Run install to verify lockfile**
+- [ ] **Step 5: Commit dependency manifest changes**
+
+---
+
+### Task 6: Fix Upgrade Breakages
+
+**Files:**
+- Modify as needed: `src/**/*.ts`
+- Modify as needed: `frontend/**/*.ts`
+- Modify as needed: `frontend/**/*.tsx`
+- Modify as needed: `tests/**/*.ts`
+- Modify as needed: config files touched by upgraded tools
+
+- [ ] **Step 1: Run typecheck**
+- [ ] **Step 2: Run lint**
+- [ ] **Step 3: Run tests**
+- [ ] **Step 4: Run build**
+- [ ] **Step 5: Commit breakage fixes**
+
+---
+
+### Task 7: Final Verification and Manual Dashboard Check
+
+**Files:**
+- No planned source changes
+
+- [ ] **Step 1: Run full verification**
+- [ ] **Step 2: Start dev server for dashboard check**
+- [ ] **Step 3: Manually verify frontend build path if browser access is available**
+- [ ] **Step 4: Check git status**
+
+---
+
+## Self-Review
+
+- Spec coverage: audit, dependency classification, replacement/removal, ESM migration, lockfile regeneration, verification, and dashboard manual check are covered.
+- Placeholder scan: no `TBD`, `TODO`, or unspecified implementation steps remain.
+- Type consistency: helper names are consistent across tasks: `validateUserStateUpdate`, `initializeMigrationSqliteDatabase`, `buildMuxFfmpegArgs`, and `runFfmpeg`.