Hello World
Write a .ts file
Save this as hello.ts. Types are optional at first; TypeScript still helps as you grow.
const message: string = "Hello, TypeScript!";
console.log(message);Compile to JavaScript
From the same folder, run the compiler. It creates hello.js.
tsc hello.tsRun the output
Use Node to execute the emitted JavaScript.
node hello.jsFix a type mistake early
If you assign the wrong kind of value, tsc reports it before you run the program.
let count: number = 3;
// count = "three"; // Error: Type 'string' is not assignable to type 'number'
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