# TypeScript migration — baseline

The state of this repository **immediately before** the first source file was
renamed, measured rather than assumed. Everything the migration does is checked
against these numbers; a figure that moves without a phase claiming it is a
regression.

Measured on 2026-09-11, on `main` with a clean tree, before any change in
Milestone 1.

## The numbers

| Check | Command | Baseline |
|---|---|---|
| Types | `npm run typecheck` | **FAILS — 71 errors across 27 files** |
| Lint | `npm run lint` | **PASSES**, exit 0 |
| Lint (with warnings) | `npx eslint .` | 289 problems — 0 errors, 289 warnings |
| Files linted | `npx eslint . --format json` | 302 |
| Behaviour | `npm test` | **1641 / 1642 checks passed** |
| Build | `npm run build` | succeeds |
| Owliver, via the suite | `npm test` section 21 | **all green** — schema, skills, routes, and per-context skills, suggestions, prompts and intent routing |
| Owliver, standalone | `node scripts/owliver-baseline.mjs` | **FAILS — pre-existing, see below** |

### The 71 type errors, by code

| Code | Count | What it is |
|---|---|---|
| TS2339 | 38 | Property does not exist on an inferred type |
| TS2741 | 9 | Missing required prop in JSX |
| TS2353 | 9 | Unknown property in an object literal |
| TS2345 | 6 | Argument type mismatch |
| TS2554 | 2 | Wrong argument count |
| TS2362 / TS2363 | 4 | Arithmetic on a non-number |
| TS2739 / TS2559 / TS2349 | 3 | Missing props / no common props / not callable |

These are **pre-existing**. They were not introduced by the migration and the
migration is not obliged to fix them; they are the backlog it has to avoid
adding to. Six of them are `import.meta` errors that Phase 1 resolves as a side
effect of configuring `vite/client`.

Note that `npm run typecheck` **is not run by CI** (`.github/workflows/ci.yml`
runs lint, test, build and the seed check). That is how 71 errors accumulated
without anyone seeing them. Wiring it in is the last phase of the migration, not
the first — it cannot be a gate until it is green.

## The standalone Owliver script is already broken

`node scripts/owliver-baseline.mjs` fails before any of this began — verified by
stashing every change and running it on a clean `main`, where it fails
identically. It is **not** caused by the migration.

```
Failed to scan for dependencies from entries:
  index.html
  scripts/__baseline__/activity-page.pre-migration.html
  … the other seven snapshots …
  ✘ [ERROR] The server is being restarted or closed. Request is outdated [plugin vite:dep-scan]
Owliver behaviour has DRIFTED from the baseline.
```

Two things are going on, and neither is a real drift. Vite's dependency scanner
treats every `*.html` under the project root as an entry point, so the eight
captured SSR snapshots in `scripts/__baseline__/` are scanned as if they were
pages of the app. The script then calls `server.close()` as soon as
`captureBaseline` returns, while that scan is still running, and the scan
reports that it was cancelled. The capture comes back incomplete and the
comparison calls it drift.

**The coverage itself is not lost.** `skill-check.mjs` imports the same
`captureBaseline` and the same `BASELINE_PATH` and asserts against them in
section 21, and it does enough other work afterwards that the scan finishes. Run
`npm test` and the whole section is green:

```
── Owliver behaviour baseline ──
[  ok  ] baseline schema matches — expected 1, got 1
[  ok  ] every skill that existed before the agent layer still registers — 23 kept, 1 added since
[  ok  ] every route that resolved before resolves the same way — 18 unchanged
[  ok  ] controlCenter: keeps every skill it had — 7 skill(s), unchanged
…per context: page key, skills, suggestions, prompts, intent routing
```

So **`npm test` is the Owliver drift check for the duration of the migration**,
and the standalone script is a convenience wrapper that needs repairing on its
own terms — excluding `scripts/__baseline__` from the scan, or awaiting the
optimizer before closing. That repair is not part of the migration: it changes
a script's behaviour, and this milestone's whole claim is that it changed none.

## The one failing check

```
1641/1642 checks passed

Failed:
  - the backend fixture is in step with this seed (stale — run `npm run seed:fixture`)
```

`scripts/__baseline__` is intact and `owliver-baseline.mjs` matches; this is not
an Owliver failure. `seed/fixtures/seed.json` in the sibling `krow-backend`
checkout has drifted from `src/api/seed.js`.

**This failure predates the migration and is unrelated to it. It is recorded
here so that it is never mistaken for something the migration caused, and it is
deliberately left alone** — regenerating the fixture would write into another
repository and change what the backend seeds, which is a product change wearing
a migration's clothes. Fix it separately, on its own terms.

## What "unchanged" means for the Owliver / agent flow

The agent flow is ~112 files and 38% of the codebase, and it is converted last,
by rename and type annotation only. The evidence that it still behaves
identically is already in the repository and needs nothing new:

- `npm test` — 1642 checks covering skill discovery, routing, context
  resolution and SSR-rendered markup.
- `scripts/__baseline__/owliver-baseline.json` — contexts, skill ids and routes.
- `scripts/__baseline__/*.pre-migration.html` — eight pages of byte-level SSR
  output.
- `node scripts/owliver-baseline.mjs` — the drift check.
- CI's `FLOOR = 900` — fails if the suite silently shrinks.

**These artifacts are read-only for the duration of the migration.** If the
baseline drifts, revert the change. Regenerating it to clear a red check records
the regression instead of catching it, which is worse than having no baseline —
`owliver-baseline.mjs` says as much in its own header.

`src/agents/**/*.md` and `src/skills/**/*.md` are likewise untouched throughout:
they are the definitions the flow is built from, not code being migrated.

## How to re-measure

```bash
npm run typecheck; echo "exit=$?"
npm run typecheck 2>&1 | grep -c "error TS"
npm run lint; echo "exit=$?"
npx eslint . --format json | python3 -c "import json,sys;print(len(json.load(sys.stdin)))"
npm test
node scripts/owliver-baseline.mjs
npm run build
git diff --stat -M
```