Class expose private methods

[sosoba]

TypeScript Version: 2.7.0-dev.20171215

Code

class ServerService {

    public getData(){
        this.privateGetData() + 2;
    };

    private privateGetData(){
        return 2;
    };

}

abstract class Client implements ServerService {

    getData():void;

}

Expected behavior:
.d.ts

declare class ServerService {
    getData(): void;
}

Compile success

Actual behavior:
TS2420: Class 'Client' incorrectly implements interface 'ServerService'.
Property 'privateGetData' is missing in type 'Client'.

.d.ts

declare class ServerService {
    getData(): void;
    private privateGetData();
}

[RyanCavanaugh]

See e.g. #10516, or ask a question on Stack Overflow if you would like more explanation as to why this works the way it does