How does TypeScript Handle Private Members and JavaScript Interoperability?

TypeScript Private Member Accessibility

TypeScript implements private members as regular JavaScript properties. As such, they are accessible from outside the class in pure JavaScript code. This can be confusing, as IntelliSense will prevent access to private members from within TypeScript code, leading to the question of whether TypeScript implements private members correctly.

The answer lies in the enforcement of privacy. TypeScript only enforces the privacy of members within the compiler. In other words, if you attempt to access a private member from within a TypeScript script, the compiler will prevent you from doing so. However, accessing a private member from outside the class in pure JavaScript code is not restricted by the compiler.

This behavior makes sense when consider that the TypeScript compiler is an optional tool. Developers have the freedom to write pure JavaScript code or a mix of TypeScript and JavaScript code. Enforcing private member privacy in all cases would hinder developers who need to interact with private members from external JavaScript code.

To create a truly private property within a class, developers must use a local variable within a function scope. This prevents the property from being accessible as a member of the class.

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