What is Downleveling in TypeScript?
Downleveling is the process of converting modern TypeScript code into an older version of JavaScript. This allows developers to target older JavaScript environments that may not support the latest features.
Downleveling is the process of converting modern TypeScript code into an older version of JavaScript. This allows developers to target older JavaScript environments that may not support the latest features.
The `noUncheckedIndexedAccess` compiler option in TypeScript helps catch potential errors when accessing arrays or tuples with undefined or out-of-bounds indices. Enabling this option ensures that developers handle cases where indexed accesses can result in undefined values.
The void operator in TypeScript and JavaScript evaluates an expression and returns `undefined`. It can be used to prevent unintended leakage of return values and handle Promises for side effects. It is useful when you want to suppress the return value of a function or initiate a Promise without handling its resolution.
Branded types in TypeScript can help catch programming errors early by ensuring that values meet certain criteria before they are used. To create a branded type, you add a readonly property to an existing type. Branded types are especially useful when combined with assertion functions, which validate inputs and assert the branded type after successful validation.
Defensive coding is a programming practice that helps make TypeScript applications more reliable and robust. It involves checking input data for errors, handling errors gracefully, respecting data boundaries, enforcing assumptions, and providing fail-safe defaults. By following these principles, developers can reduce the risk of bugs and security vulnerabilities.