typed-function

import typed from 'typed-function'; // Create a typed function with a single signature const greet = typed({ 'string, string': function (firstName, lastName) { return `Hello, ${firstName} ${lastName}!`; } }); console.log(greet('John', 'Doe')); // Expected output: "Hello, John Doe!" // Create a typed function with multiple signatures (overloading) // and a union type for one argument const calculate = typed({ 'number, number': function (a, b) { return a + b; }, 'string, string': function (a, b) { return a + b; // string concatenation }, 'number, number | string': function (a, b) { // This signature allows a number and a number or string for the second argument. // 'typed-function' will attempt type conversion if possible based on registered types. return `Result: ${a + b}`; } }); console.log(calculate(5, 3)); // Expected output: 8 console.log(calculate('Hello', ' World')); // Expected output: "Hello World" try { console.log(calculate(10, '20')); // Matches 'number, number | string' } catch (e) { console.error("Error calling calculate with number and string:", e.message); } // Example of a function designed to throw an error for unsupported types const processDate = typed({ 'Date': function(date) { return `It's a date: ${date.toDateString()}`; } }); try { console.log(processDate('not a date')); } catch (e) { console.error("Error calling processDate:", e.message); } // Expected: Error calling processDate: TypeError: Unexpected type of argument 1 (expected Date, got string) in function processDate