Web Reference: TypeScript has no dedicated functions to do anything. It's a typing system and a transpiler, not a library. As you say it is bad to just check if () {} since that will also be true for 0. Using a juggling-check, you can test both null and undefined in one hit: Oct 19, 2025 · Understanding the difference between null and undefined is crucial for writing robust and error-free TypeScript code. This blog post will dive deep into these two concepts, covering their fundamental ideas, usage methods, common practices, and best practices. null and undefined are primitive types and can be used like other types, such as string. When strictNullChecks is enabled, TypeScript requires values to be set unless undefined is explicitly added to the type. Optional chaining is a JavaScript feature that works well with TypeScript's null handling.
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