Unexpected TS4094 with the build parameter `declaration: true`

TypeScript Version: 2.4.1

Code

var Foo = class Foo {
    private _message = "Hi";
    hi() { return this._message; }
}

tsc test.ts -t es2017 -d

Expected behavior: -d should not cause this message: test.ts(1,5): error TS4094: Property '_message' of exported class expression may not be private or protected.

Actual behavior: It does.

There should at least be a suppression parameter to ignore this error.

[emartinpi]

Anyone knows if there has been any progress with this?

[matthewadams]

@weswigham Well, until it’s addressed, my workaround is to devolve back to using _ (underscore) prefixes to indicate that a method is not public, which seems just dumb given TypeScript’s access modifiers. Further, traits/mixins are, IMHO, the best (read: most practical) way to achieve composability and avoid brittle inheritance hierarchies, which is why I feel that it would do all of us good to have this fixed sooner rather than later.