typescript-register

{ // bar.js process.env.TYPESCRIPT_REGISTER_EMIT_ERROR = 'true'; process.env.TYPESCRIPT_REGISTER_USE_CACHE = 'true'; // Optional: Configure TypeScript compiler options. This example targets ES2018 // and uses CommonJS modules, with strict type checking enabled. process.env.TYPESCRIPT_REGISTER_COMPILER_OPTIONS = JSON.stringify({ target: 'es2018', module: 'commonjs', strict: true, esModuleInterop: true // Often needed for better interop with CommonJS }); // Activate the TypeScript require hook. All subsequent `require` calls for .ts files // will be transpiled on the fly. require('typescript-register'); // Attempt to require a TypeScript file. try { // Ensure 'foo.ts' exists in the same directory as 'bar.js' // Example content for 'foo.ts': `export var foo = 3; export const greeting = "Hello";` const fooModule = require('./foo.ts'); console.log('Value from foo.ts:', fooModule.foo); // Expected: 3 console.log('Greeting from foo.ts:', fooModule.greeting); // Expected: "Hello" } catch (e) { console.error('Error requiring TypeScript file:', e.message); if (e.stack) { console.error(e.stack); } } // Additional example: a type-checked function in TypeScript /* // In a file named 'calculator.ts' export function add(a: number, b: number): number { return a + b; } */ try { const calculator = require('./calculator.ts'); console.log('2 + 3 =', calculator.add(2, 3)); // Expected: 5 // This would typically cause a TypeScript error during compilation if type-checked: // console.log('2 + "3" =', calculator.add(2, "3")); } catch (e) { console.error('Error requiring calculator.ts:', e.message); }}