Object destructuring with default values and string literals.

[denis-mludek]

TypeScript Version: 2.0

Code

interface Foo {
  bar?: 'baz' | 'boz'
}

function x(params: Foo) {
  // doesn't work
  const { bar = 'baz' } = params
}

function y(params: Foo) {
  // works
  const { bar = 'baz' as 'baz' } = params
}

Expected behavior:
To compile

Actual behavior:
error TS2322: Type 'string' is not assignable to type '"baz" | "boz"'. Type 'string' is not assignable to type '"boz"'.

[mhegazy]

This should be working as expected in latest.