Concept / DemoCustom module
Quote engine — custom module
Shows a self-contained module with its own config, tests and a small admin UI.
A concept by MS Keys Gate, built to demonstrate capability. It is not a client project and was never commissioned.
Screens
quote-engine.example
Quote form. The customer-facing calculator with a live running total.
What it sets out to prove
- Drop into an existing app without touching its core
- Keep pricing rules in data, editable by a non-developer
- Ship with tests that pin the rules, so changes are safe
Built with
- TypeScript
- Rules as data
- Unit tests
- Adapter interface
Rules are configuration
Base rates, modifiers and discounts live in a validated config object, not in branching code.
One integration seam
The host app talks to a single adapter interface, so the module can be swapped or upgraded in isolation.
A look at the code
Pricing as a pure function over config
export function priceQuote(input: QuoteInput, rules: PricingRules): Quote {
const base = rules.baseRates[input.tier];
const lines = rules.modifiers
.filter((m) => m.applies(input))
.map((m) => ({ label: m.label, amount: m.amount(base, input) }));
const subtotal = lines.reduce((sum, l) => sum + l.amount, base);
const discount = rules.discountFor(input, subtotal);
return { base, lines, discount, total: subtotal - discount };
}Illustrative snippet from the concept (typescript).
Take this further
The thinking here carries straight into a real project. See the Plugin development service, or tell us what you have in mind.
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