When working with TypeScript, achieving the same level of accessibility as Java's protected members is possible by using certain techniques. For example, you can have a class Foo and a class Foo2 that are able to access each other's "protected" members while remaining inaccessible to classes outside of their defined scope such as Bar.
At the moment, TypeScript does not have a built-in internal access modifier. One workaround is to utilize an escape hatch for accessing protected/private class members:
class Foo {
protected f1 = "f1"
}
class Foo2 {
protected f2 = "f2"
public doSomething(foo: Foo) {
foo["f1"] // this works
}
}
You can access a protected member from another class using bracket notation.
This workaround effectively conceals protected members from external classes in most cases. If classes like Foo and Foo2 are closely related within the same package, they might need to know certain implementation details of each other, such as the name of a protected property. Therefore, this approach can be considered architecturally sound.
To enhance security further, you could create separate types for Foo and Foo2 that define only the public API accessible to clients:
class Foo implements FooPublic {
publicProp = 42
protected foo = "foo"
}
interface FooPublic {
publicProp: number // only publicProp is exposed to clients
}
Additionally, there is an ESLint rule named import/no-internal-modules, which prohibits clients from directly importing your actual class from a sub-module.
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