The owner's first report: a cost's post was fixed at creation and could not be
changed. RecurringCost has carried splits and splitMode with the same shape as
Purchase since the first version, so this wires up a capability the data model
already had rather than adding one — and a bill can now span envelopes.
SplitEditor is narrowed from PurchaseDraft to the four fields it actually
reads. PurchaseDraft satisfies that structurally, so the dialog's call site
does not change at all.
The anchoring control is disabled once a cost has charges, matching the store's
refusal rather than offering an action that would fail on save.
Also fixes a carried item: the anchoring handler now expands a month-only
startDate in the same mutate call that switches to lastCharge anchoring,
matching the normalisation the recurrence-kind handler already had — an
everyNMonths cost anchored to lastCharge needs a day-granular startDate, and
the store validates that pairing on every write.
Two requests. The second is small; the first changed the money layer.
TYPING THE CURRENCY. The purchase total field now reads "30$" as thirty
dollars, "€25,50" as EUR 25.50, "250 kr" as DKK, "1.234,56 usd" as USD
1234.56, and sets the currency selector from what was typed. Entry speed is a
stated product feature and a second control per amount works against it.
The field is type="text", not type="number": a number input silently discards
anything non-numeric, so "30$" would never reach the parser. It keeps its own
text so a half-typed "30." stays as typed and only commits when it parses.
Separator handling is where parseMoneyInput earns its 26 tests. With both "."
and "," present the LAST is the decimal point, which covers "1.234,56" and
"1,234.56" without knowing a locale. With one, it groups thousands if exactly
three digits follow and is a decimal point otherwise — so "1,500" is fifteen
hundred and "1,5" is one and a half. Spaces group thousands only in
three-digit groups, because "30 40" is two amounts typed by mistake and
committing it as 3040 would be worse than rejecting it. An unrecognised
currency returns null rather than falling back: reading "30 GBP" as 30 DKK
would book money at the wrong currency.
USER-DEFINED CURRENCIES. `Currency` was a closed union and decimal places were
a module constant, so "add a currency" was a code change. Both now live in the
dataset: `Dataset.currencies` is the authority on which codes are valid, what
they are called, their symbol, and how many decimals they round to. Settings
grows a table to add, edit and remove them.
That forced the money layer open. `roundMoney` takes a DIGIT COUNT, not a
currency code, and every one of its ~29 call sites resolves digits from the
dataset via `digitsFor`. Making digits a required number rather than an
optional one with a default of 2 is the whole safety argument: every site
became a compile error the type checker enumerated for me, where a default
would have left each one silently correct for DKK/USD/EUR and silently wrong
for the first zero-decimal currency the owner adds.
Because every existing currency uses two decimals, a broken version of this
refactor would still pass all 356 previous tests. src/domain/currencyDigits.test.ts
is the oracle that cannot lie: a JPY-style zero-decimal currency driven through
roundMoney, both FX directions, both split modes, finance-plan division, the
fold, and the month view, asserting no figure has a fractional yen in it.
Guards that come with it, all tested:
- Codes are identity — they key the FX table and every stored Money — so they
are normalised (" jpy " -> "JPY") and cannot be edited, only added/removed.
- A currency in use cannot be removed, and the refusal names what refers to
it. The same reasoning as posts being archived rather than deleted: stored
Money carries the code, and dangling references would make the import
validator refuse the owner's own exported file. Removing an unused one takes
its exchange rate with it, leaving no orphan row.
- The import validator now checks the currency table itself — codes, duplicate
codes, integer decimals 0-4 — and validates every Money against it. That
boundary check replaces the compile-time safety the closed union provided.
- parseFxResponse takes the accepted codes instead of a global constant, so a
rate service returning dozens cannot put unreachable rows in the table.
Migration v2 -> v3 seeds the currency table. Behaviour-preserving by
construction: every currency that existed had two decimal places and the
seeded table records two, so not one stored amount can round differently than
it did before. An existing `currencies` field is kept rather than overwritten,
since a hand-edited file could already carry currencies the owner added.
Verified in the browser, not just in tests: JPY added through the real Settings
form with 0 decimals, and the five inputs above typed into the real purchase
field, each setting the right currency.
Two obsolete test helpers went away. plans.test.ts and actions.test.ts used to
monkey-patch the CURRENCY_DIGITS constant to prove the table was consulted;
digits are an argument now, so those tests just ask for zero decimals.
types.test.ts no longer asserts "the supported currencies are exactly DKK,
USD, EUR" — that stopped being a property of the code.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Implements docs/superpowers/specs/2026-09-02-fast-entry-refinements-design.md.
Three changes shipped together because they share one tab order.
Bulk rows are description -> amount -> note, and nothing else is a tab stop.
The list always ends in exactly one blank row, appended as soon as the last
row is filled, so Tab flows into a new line with no special case and new rows
appear on touch too. The Add-line button is gone; the per-row remove button is
now a hover/focus x with tabIndex={-1}, and Backspace in an empty description
removes the row and lands on the previous row's note.
Purchases no longer demand a day. `date` accepts "2026-09" as well as
"2026-09-14"; entry defaults to the month, with an opt-in "set exact date"
link. No migration: monthOf() already parsed both shapes, verified before
choosing this over splitting the field into month + optional day, which would
have meant a schema migration in the browser against the user's only copy of
their data for an identical outcome.
Notes are an optional field on Purchase, in both entry forms and shown beside
the description in the month lists. Empty notes are omitted rather than stored
as "", so absent stays absent.
Also closes a pre-existing gap the spec surfaced: the JSON importer never
validated purchase.date, so a malformed date passed import and threw later
inside the balance fold. It is now rejected at the boundary, with out-of-range
months and days covered.
A row holding only a note is deliberately NOT blank: it asks for the missing
description and amount rather than being silently discarded.
Keyboard behaviour - tab traversal, Backspace-to-remove, focus after append -
cannot be verified in this environment and needs confirming in a browser.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Plans default to an equal split, each slice is individually editable, and
plans compose with splits. Cancelling keeps past slices.
planBalance delegates to domain slicesBalance rather than recomputing the
same total-minus-slices arithmetic, per the project's one-implementation
rule for shared math.
Validation lives in purchaseForm.ts as pure functions. Unbalanced splits
and over-budget purchases are deliberately not errors.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Lucas Winther