strictNullChecks does not ensure class properties are initialized in constructor

[Swatinem]

TypeScript Version: 2.1.0-dev.20160909

Code

class A {
    prop: string;
}

const a = new A();
a.prop.length; // TypeError: Cannot read property 'length' of undefined

Expected behavior:

TS should throw a compile time error to ensure that non-nullable class members are initialized inside the constructor and can not lead to runtime errors.

Actual behavior:

No compile time error, rather an exception at runtime

[RyanCavanaugh]

Duplicate #8476.

[Swatinem]

Thanks for reminding me. Default search is set to is: open though -_-