This blog post provides an overview of how to implement read-only properties in TypeScript using the 'readonly' keyword. It discusses various scenarios, including immutable object properties, read-only index signatures, and class properties. The author notes that while TypeScript enforces these constraints at compile time, it does not affect the emitted JavaScript. Additionally, the post explains how certain types, such as ReadonlyArray, ensure the immutability of arrays. Overall, it emphasizes the importance of read-only features for building more resilient and predictable code in TypeScript.
TypeScript's read-only accessibility is similar to JavaScript's const; however, it is only checked at compile time and does not affect the emitted JavaScript.
Making a property immutable ensures no changes after initialization. If a property is read-only, we cannot modify it but must create a new object instead.
Read-only index signatures can also be created using the keyword readonly, preventing modifications through indexed access to values.
Classes in TypeScript can have read-only properties that must be initialized directly or in the constructor and cannot change afterward.
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