Property assignment in functions called from constructor

[Ionaru]

TypeScript Version: 3.0.0-dev.20180526

Search Terms:
Initializer nested function

Code

class Initializer {
    public testValue: string;

    constructor() {
        this.setValue();
    }

    public setValue() {
        this.testValue = 'A value';
    }
}

(Compile with strictNullChecks and strictPropertyInitialization enabled)

Expected behavior:
Code compiles because the testvalue property is always defined in a class instance. Even though it's not directly in the constructor.

Actual behavior:
Compiler gives the error:

src/initializer.ts:2:12 - error TS2564: Property 'testValue' has no initializer and is not definitely assigned in the constructor.

2     public testValue: string;
             ~~~~~~~~~

Playground Link:
Link to the playground
Enable strictNullChecks and strictPropertyInitialization

Related Issues:
I did not find any related issues.

[s-ve]

Seems to be a duplicate of #21132

[Ionaru]

I'd like to know if this is still a "design limitation" in Typescript 3

[RyanCavanaugh]

Yes; we have no immediate plans to do aggressive function inlining analysis to prevent/catch more class property initialization issues.