A readonly interface property can be implmented as writeonly class property?

[jamesfancy]

TypeScript Version: 4.0.0-Beta

Search Terms:

• getter setter
• writeonly property
• readonly property

Code

interface ITest {
    readonly name: string;
}

class Test implements ITest {
    #_name: string = "";
    set name(value: string) { this.#_name = value; }
}

const test = new Test();
test.name = "James";

const it = test;
console.log(it.name);

Expected behavior:

TSC can report a error since Test does not implment get name accessor.

ITest declare name property is readonly, that means name is readable. But name property of Test is not readable. It's against the interface.

Actual behavior:

No Error.

Playground Link: Provided

Related Issues:

maybe related to #12, but they are different.

[yw662]

#21759 might be another way to think of this

[RyanCavanaugh]

TS doesn't have a notion of a "writeonly" property (see prior comment) so a property is always assumed to have a read side.

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.