TypeScript is a programming language developed by Microsoft that is a superset of JavaScript. It adds static typing and other features to JavaScript, making it more robust and scalable for large-scale applications. TypeScript code needs to be transpiled into JavaScript before it can be executed in a browser.
To convert TypeScript code to JavaScript, the exports/require statements are used. These statements are part of the CommonJS module system, which is a module format used in Node.js and supported by most bundlers and build tools.
The exports statement is used to define what parts of a module should be accessible to other modules. It allows you to export functions, objects, or values from a module. For example:
// math.ts
export function add(a: number, b: number): number {
return a + b;
}
// main.ts
import { add } from './math';
console.log(add(2, 3)); // Output: 5
In this example, the add function is exported from the math module using the exports statement. It can then be imported and used in the main module using the import statement.
The require statement is used to import modules in CommonJS. It is typically used in Node.js environments or with bundlers like Webpack. For example:
const math = require('./math');
console.log(math.add(2, 3)); // Output: 5
In this example, the math module is imported using the require statement. The add function can then be accessed using the math object.
When converting TypeScript code to JavaScript, the TypeScript compiler (tsc) automatically transpiles the exports/require statements into the appropriate JavaScript module syntax based on the target module system specified in the tsconfig.json file.
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