Comments on inner properties are stripped

TS: 2.0.0

// code.ts
/**
 * Some foo
 */
export const foo = {
  /**
   * Some boo
   */
  boo = 0
}

expect:

// code.d.ts
/**
 * Some foo
 */
export declare foo: {
  /**
   * Some boo
   */
  boo: number;
}

actual:

// code.d.ts
/**
 * Some foo
 */
export declare foo: {
  boo: number;
}

By the way, is there a way to separately control whether comment should be kept in *.d.ts and *.js?

Currently when tsconfig.json/compilerOptions/removeComments = true, comments are removed from both of them.

Would it be nice to keep the comments in *.d.ts but not *.js?