Web Reference: In this tutorial, you will learn how to use the TypeScript readonly access modifier to mark class properties as immutable properties. In this chapter, we look at how can make things “read-only” in TypeScript – mainly via the keyword readonly. In JavaScript, if a variable is declared via const, the binding becomes immutable but not the bound value: Sep 11, 2025 · In TypeScript, the readonly modifier ensures that a property can be assigned a value only once during initialization and cannot be changed thereafter. This immutability helps prevent accidental modifications to object properties, enhancing code reliability.
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