value-objects-money-and-units
Enforces a pure-Dart value-object core that stores every quantity canonically — money as integer minor units keyed to each currency's real ISO-4217 exponent (never *100), physical amounts as SI whole units, timestamps as UTC — and converts only at the presentation edge; forbids double/num money, cross-currency arithmetic, and defaulting an unknown currency to two decimals; routes every division of money through one largest-remainder allocate() primitive so parts always sum to the whole to the exact minor unit; derives totals instead of storing them, links entities by stable id, and injects a Clock instead of DateTime.now. Use when defining or changing Money, Currency, or a unit value object; parsing or formatting an amount; splitting, prorating, discounting, tax/tip, or distributing money; adding a currency or FX rate; converting quantities; or fixing float-money, hardcoded-100, cross-currency, off-by-a-cent, or stored-total-drift bugs.
Install
With your agent
Install OMGSkills skill "zakariaf/flutter-skills:skills/value-objects-money-and-units" into this agent's normal skills directory: call the OMGSkills MCP get_install_plan tool for your agent and run the script it returns (it installs only the pinned commit and verifies SKILL.md), and stop if MCP or the pin is unavailable. Do not overwrite or change existing skills without asking me.
Manual command
git clone https://github.com/zakariaf/Flutter-Skills /tmp/Flutter-Skills && ln -s /tmp/Flutter-Skills/skills/value-objects-money-and-units ~/.claude/skills/value-objects-money-and-unitsFrom README
Value objects: money & units Store every quantity once, in one canonical form, and convert only when shown or exported. Money is integer minor units plus a currency; physical quantities are whole SI base units; time is UTC. This is what lets a user flip any display preference (currency symbol, unit system, locale) without corrupting one stored row, and lets "sum of parts == whole" be structural, not hoped-for. This core is pure Dart — no flutter/, no intl, no dart:io, no plugins. Formatting and digit normalization happen upstream/downstream, not here. These value objects live in lib/core/, the sanctioned pure-foundation layer (see project-structure-and-packages) — never a utils//common//shared/ grab-bag. Read the reference for the task at hand: references/allocate-and-splitting.md — the largest-remainder allocate() primitive, its invariants, the two-rounding-sites trap, edge policies, verified test vectors, and the subtotal→tax→tip split pipeline.
More from this repo
accessibility-as-code
Enforces accessibility as a correctness property authored into each widget — Semantics(button/label) or...
adaptive-layout
Enforces adapting layout by available CONSTRAINTS/size, never device or platform checks — LayoutBuilder +...
ads-and-iap-monetization
Enforces opt-in, rewarded-first monetization over the service seam — a rewarded view grants exactly one benefit and...