Uninitialized readonly property is not reported

[dobrakmato]

TypeScript Version: 2.5.2

Code

class Connection {
    public query(sql) {
        return null;
    }
}

class Database {
    private readonly property: string = 'This is initialized';
    private readonly thisToo: number;
    private readonly connection: Connection;

    constructor() {
        this.thisToo = 42;
    }

    public importantMethod() {
        return this.connection.query('SELECT * FROM users');
    }
}

Expected behavior:
I expect the property connection to be reported as "Not initialized read-only property" error because it is

1. not initialized in constructor
2. also marked as readonly so it can't be initialized anywhere else.

Actual behavior:
Compiler generates broken / not working code.

var Database = /** @class */ (function () {
    function Database() {
        this.property = 'This is initialized';
        this.thisToo = 42;
    }
    Database.prototype.importantMethod = function () {
        return this.connection.query('SELECT * FROM users');
    };
    return Database;
}());

[mhegazy]

This should be done along with #8476. basically same analysis required in both cases.

[mhegazy]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.