How to simultaneously check for both null and undefined in TypeScript?

Hello, colleagues! I'm new to TypeScript and have encountered a problem that seems simple but is causing confusion. I need to write a check that filters out both `null` and `undefined`. In JavaScript, I'm used to just writing `if (value)`, but in TypeScript this is not always correct, since an empty string or 0 are also considered falsy values, and I could lose data. Here's an example of my code: ```typescript function processUser(user: { name: string | null | undefined; age?: number }) { // How to correctly check that user.name is not null and not undefined? if (user.name) { console.log(user.name.toUpperCase()); // Works, but what if name = ""? } // I tried this: if (user.name !== null && user.name !== undefined) { console.log(user.name.length); // Works, but