Change-detectors, tautologies, source-reading tests, redundant duplicates,
mock-echo tests and dead/unrunnable tests. Per-test rationale in the lane
ledger (category + reason for every removal).
Widen the salvaged guard from a hand-maintained four-package floor to the
class it stands for: every `dependencies` + `devDependencies` entry in the
desktop workspace manifest. Live probe on this box: a tree holding vite,
katex, electron and electron-builder but missing `@rolldown/plugin-babel`
still passed the floor-only guard, and `vite build` died loading
`vite.config.ts` after `prebuild` had already run. The floor stays as an
unconditional fallback for an unreadable manifest; optionalDependencies
are skipped because npm legitimately omits them (get-windows).
Five new vitest cases (12 total); the two class tests fail when the
manifest union is removed. Refs #86443.
Follow-up to the salvaged #87980: the test kept its own copy of the
build-critical package list (drift hazard) and the module's default
export had no consumer.
Refs #86443
assert-root-install.mjs exists to turn an incomplete root install into one
actionable line instead of a failure deep inside the build. It only ever
checked that vite resolved, so an install covering part of the workspace
graph passed the guard and died later on something else. That is the shape
reported in #86443: the updater's npm install brought in 521 of the 769
packages a full install gives, root node_modules had vite but not katex, and
the build failed on an unresolved katex/dist/katex.min.css with nothing
pointing at the install as the cause. apps/desktop/src/styles.css imports
that stylesheet, so katex is as load-bearing for the renderer bundle as vite
is, and electron / electron-builder are the same for packaging.
Check all four and name every missing one, so a partial install is reported
once and completely rather than one package per build attempt.
Resolution walks node_modules upward the way Node's own lookup does, rather
than going through require.resolve: a package whose exports map does not
expose ./package.json is not resolvable by path even when correctly
installed, and that must not read as missing. It also keeps a dependency
that landed in the app workspace instead of the hoisted root passing.
The guard now runs from prebuild, ahead of npm run clean, so a tree that
cannot build is rejected before the build deletes its own outputs. On this
checkout clean removes build/electron-types and the tsbuildinfo files, not
release/, so this ordering is not by itself what saves a packaged app; it is
the narrow correctness point that a doomed build should not destroy anything
first. build keeps its own call for anyone invoking the build steps directly,
and the check is pure filesystem lookups, so running it twice costs nothing.
The check is extracted as a pure checkRootInstall() returning {ok, error},
matching assert-dist-built.mjs, so it is unit testable without spawning a
process.
