typecheck.yml

# The type gate. There is no test suite in this repo to run.
#
# Until MX-222 this repo's only CI job was `managed-install`, which proves the
# plugin BUILDS from a git install and says nothing about whether it works:
# `bb plugin build` bundles WITHOUT typechecking, so a type error anywhere in
# server.ts (34k) or app.tsx still produced a green check.
#
# This is a SEPARATE job rather than more steps on managed-install, because
# that job installs `--omit=dev` — typescript and @types/* are absent by the
# time it ends.
#
# What a green run here covers: `tsc --noEmit` under `strict` with
# `skipLibCheck: false`, over server.ts, app.tsx, components, lib, hooks and
# types. What it does NOT cover: whether any of it WORKS. Green means it
# compiles — MX-835 was a type-correct `undefined` that bb's RPC serialiser
# refused at runtime, and it passed this job. Execution lives in the sibling
# `Test` job (.github/workflows/test.yml), which covers lib/ only.
name: Typecheck

on:
  pull_request:
  push:
    branches: [main, main-public]
  workflow_dispatch:

jobs:
  typecheck:
    name: tsc --noEmit
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: "22"
      # `npm ci` rather than `npm install`: it installs the lockfile exactly and
      # fails when package.json and package-lock.json disagree, so CI checks the
      # tree a fresh clone would get.
      - run: npm ci --no-audit --no-fund
      - run: npm run typecheck