Web Reference: We can get this functionality in TypeScript by adding a ? to the end of parameters we want to be optional. For example, let’s say we want the last name parameter from above to be optional: Comprehensive reference for TypeScript error codes. Find explanations, common causes, and fixes for every TS compiler error with real code examples. Nov 18, 2025 · Learn how TypeScript's optional properties and strict null checks prevent null reference errors at compile time. Master null handling patterns with optional chaining, nullish coalescing, and type narrowing techniques.
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