Lucas WintherandClaude Opus 5
ed1667f8a0
Fixes the three findings from the final whole-branch review:
- SnapshotStore.mutate/replace now serialize behind a promise queue, so
concurrent mutate() calls (e.g. two independent onChange handlers firing
before either write resolves) each clone from the previous commit instead
of racing on a stale snapshot and silently losing an edit. Preserves
write-before-move-snapshot, caller-visible rejections, structuredClone
identity, and non-wedging on a failed write. Adds tests for concurrent
mutations and a failing write mid-queue.
- DataSection's exportJson/exportOds are wrapped in try/catch and report
failures through the existing import error state/rendering, since a throw
(e.g. MissingRateError from buildOds) inside a plain onClick is invisible
to the error boundary. The pre-import JSON backup now explicitly aborts
the destructive replace if the backup export fails, rather than relying on
an uncaught throw to prevent it.
- PlanEditor no longer calls monthOf()/withPlan() with an empty or partial
date from a native <input type="date">, and requires an integer month
count (with step={1}) before calling withPlan/equalSlices, preventing
both domain throws from firing inside plain event handlers.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Budget 2.0
A personal budgeting PWA. Envelope-style monthly budgets with rollover, split purchases, finance plans, multi-currency, and JSON/ODS export. All data lives in your browser — there is no server and no account.
Development
bun install
bun --hot src/index.ts # dev server with hot reload
bun test # run the test suite
bun run build # production build into dist/
Self-hosting with Docker
docker build -t budget2 .
docker run --rm -p 3000:3000 budget2
To serve from a subpath, build and run with BUN_PUBLIC_BASE_PATH:
docker build -t budget2 --build-arg BUN_PUBLIC_BASE_PATH=/budget/ .
docker run --rm -p 3000:3000 -e BUN_PUBLIC_BASE_PATH=/budget/ budget2
GitHub Pages
Pushing to main builds and deploys to Pages automatically, using
/<repository-name>/ as the base path. Enable Pages with "GitHub Actions" as
the source in the repository settings.
Your data
Everything is stored in this browser's IndexedDB. Export regularly from Settings → Your data: the JSON export is both your backup and how you move your budget to another device. Import replaces everything and downloads a backup of your current data first.
Known limitations
- Data is per-browser. There is no account and no sync. If you clear this browser's site data, or move to a different browser or device, your budget is gone unless you exported it first. The JSON export is not just a nice-to-have backup — it is the only way to move a budget between devices.
- The install prompt is incomplete.
manifest.webmanifestcurrently only ships an SVG icon. Chrome requires PNG icons at 192×192 and 512×512 to offer the "Install app" prompt; until those are added, the app works fine as a regular tab but won't be installable on Chrome/Chromium.
Documentation
- Design:
docs/superpowers/specs/2026-09-01-budget-app-design.md - Implementation plan:
docs/superpowers/plans/2026-09-01-budget-app.md