Documentation - TypeScript for JavaScript Programmers

TypeScript stands in an unusual relationship to JavaScript. TypeScript offers all of JavaScript’s features, and an additional layer on top of these: TypeScript’s type system. For example, JavaScript provides language primitives like string and number, but it doesn’t check that you’ve consistently assigned these. TypeScript does. This means that your existing working JavaScript code is also TypeScr

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“interface Person { firstName: string; lastName: string; } function greeter(person: Person) { return "Hello, " + person.firstName + " " + person.lastName; } let user = { firstName: "Jane", lastName: "User" };”

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TypeScript入門