WaSHIMathematical Optimization Modeler in TypeScript

import { Model, expr, maximize } from "@ohtaman/washi";

// 1. Create a model
const m = new Model("WoodworkingProfit");

// 2. Define decision variables with realistic bounds
const desks = m.integer("desks", { lb: 0, ub: 100 });
const chairs = m.integer("chairs", { lb: 0, ub: 100 });

// 3. Set objective function ($30/desk, $50/chair)
m.objective(maximize(expr`30 * ${desks} + 50 * ${chairs}`));

// 4. Add constraints (material and labor limits)
m.constraint(expr`${desks} + 2 * ${chairs} <= 40`, "wood_limit");
m.constraint(expr`2 * ${desks} + ${chairs} <= 50`, "labor_limit");

// 5. Solve via WebAssembly (HiGHS)
await m.solve();

if (m.hasPrimalSolution) {
  console.log(`Produce: ${desks.value} desks, ${chairs.value} chairs`);
  console.log(`Maximum Profit: $${m.objectiveValue}`);
}