Misleading error message for `super.instanceProperty`

Take the following code:

export abstract class YaddaBase {
    protected roots = "hi";
}

export class DerivedYadda extends YaddaBase {
    public get rootTests() {
        return super.roots;
    }
}

TypeScript nightly (5.3.0-dev.20230926) reports:

Class field 'roots' defined by the parent class is not accessible in the child class via super.

The error message here is confusing - one might believe that this has to do with accessing a member with a protected modifier, but it is really about accessing an instance field with super. A better error message would be:

'roots' is defined as an instance property and must be accessed through 'this', not 'super'.

We can also provide a quick fix for this error message.

TypeScript のスニペットで診断を再現し、報告されたメッセージがどこで定義されているかを調査します。診断が、インスタンスプロパティには super ではなく this を介してアクセスする必要があることを明確に説明し、提案された quick fix を issue の一部として評価できれば完了です。