TypeScript Version: 2.7.0-dev.20180110

Code

export class Test { private _foo: string; constructor() { this._init(); } private _init() { this._foo = 'test'; } }

https://github.com/berickson1/Playground/blob/master/strictPropertyInitError.ts

Expected behavior:
Code compiles with strict flags on

Actual behavior:
strictPropertyInitError.ts(4,13): error TS2564: Property '_foo' has no initializer and is not definitely assigned in the constructor.