TypeScript 6 Enterprise Setup

Set up a strict TypeScript baseline that catches production bugs without slowing teams down.

28 min

4 sections

typescript

tsconfig

strict

tooling

01. Why Enterprise Teams Use TypeScript

Section 1 of 4

TypeScript is not just syntax. In large applications it becomes an executable design contract between API clients, UI screens, background jobs, shared packages, and tests. The goal is to make invalid states hard to represent, keep refactors safe, and document domain behavior directly in code.

typescript

// JavaScript lets this bug ship until runtime.
function applyDiscount(invoice, discount) {
  return invoice.total - discount.amount;
}

applyDiscount({ total: 1200 }, { percent: 10 });

// TypeScript forces the contract to be explicit.
type Money = { cents: number; currency: "USD" | "EUR" };
type FixedDiscount = { kind: "fixed"; amount: Money };

function applyFixedDiscount(invoiceTotal: Money, discount: FixedDiscount): Money {
  return {
    cents: invoiceTotal.cents - discount.amount.cents,
    currency: invoiceTotal.currency,
  };
}

Everyday Types for Enterprise Data

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