The payment-input gate (well-tested by Phase 1) migrates to TypeScript as
a .cts (CommonJS) module: keeps require/module.exports, imports the branded
Cents type from money.mts, and casts the require(esm) result so toCents/
fromCents keep their branded signatures. This proves the low-churn path for
the ~90 remaining CJS services/routes (no require→import rewrite needed).
Both server-TS patterns now proven end-to-end: .mts (ESM, type-source) +
.cts (CJS). typecheck:server clean; suite 225 + probe 17/17.
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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