Completes the JS→TS server migration. server.js → server.cts (Node
type-stripping, no build step), and every launch/config reference now
points at it: package.json (main/dev:api/start/check:server) and the
Docker CMD.
scripts/seedDemoData.js is required at runtime by routes/user.cts, so it
crosses into the server runtime — migrated to .cts and its require of
db/database updated to the .cts path. The remaining scripts/*.js are
standalone dev/ops tooling (outside the runtime and the check:server
boundary); their stale extensionless requires of now-.cts modules were
repaired so they still run, and the PM2 ecosystem config entry point was
updated to server.cts.
Verified: 0 runtime .js remain in the server tree; typecheck:server and
check:server clean; 226/226 tests pass; `node server.cts` boots and
/api/health returns 200.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Establishes the server-TypeScript foundation and migrates utils/money →
utils/money.mts with branded Cents/Dollars (mirroring the client), so the
cents↔dollars boundary — the origin of the reconciliation bug class — is a
compile error for any typed server caller.
Approach (no build step): Node 25 runs .ts natively (type-stripping).
Migrated modules use the explicit-ESM .mts extension (the project is
"type":"commonjs", which disables .ts ESM auto-detection) and are required
from the CJS callers via Node's require(esm) — verified working. Infra:
tsconfig.server.json (allowJs + checkJs:false → incremental like the
client), npm run typecheck:server, check:server extended to .mts, wired
into ci. 28 require sites repointed to money.mts.
typecheck:server clean; full server suite 225 + e2e probe 17/17 green.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
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