Salsa does not support @type annotation in object member

[Jessidhia]

TypeScript Version: 2.2.0-dev.20170102 (--strictNullChecks)

Code

const obj = {
  /** @type {string|undefined} */
  foo: undefined
}
obj.foo = 'string'
obj.foo // type is `undefined`

Expected behavior:

Type of obj.foo to be string | undefined

Current workaround is something like:

const obj = {
  foo: (/** @returns {string|undefined} */() => undefined)()
}
obj.foo // type is `string | undefined`

A @type annotation could also be placed in the obj itself, but that gets unwieldy when the object itself is large.

Putting all these things in an object like this is arguably an anti-pattern (should be a module or class instead), but it's a start when adapting decade-old legacy code :)

Possibly related to #5158 as supporting its "assertion-y" use would make for a simpler workaround that doesn't require an IIFE.

[mohsen1]

Is this issue related? microsoft/vscode#18184

[Jessidhia]

Nope, that seems to be about VS Code 1.8's automatic @types acquisition. The annotation there is also on the variable itself, instead of a member of the object.