[Salsa] Type completions not available for @param annotations

[Jessidhia]

TypeScript Version: 2.2.0

Code

/**
 * @param {|} bar
 * @returns {}
 */
function foo(bar) {}

Expected behavior:
Requesting a completion inside the {} after @param should return type name completion

Actual behavior:
No suggestions besides text suggestions are available.

Note that suggestions do work inside the {} after @returns.

I don't seem to be able to get good completions inside of a @returns.

We don't do this for regular types either.

Based on what I've seen of completions.ts, it handles a few special cases (right of dot, JSX tag) and then calls tryGetGlobalSymbols(). There's a comment in that function saying /// TODO filter meaning based on the current context. This should be doable based on the parent node. In your example the parent node is a JSDocTypeExpression, so it has to be a type. In an expression it has to be a value, except in a type assertion expression.
We should also prefer local symbols first. E.g.:

I'm obviously trying to print x, not __dirname!

So there are 2 issues blocking getting useful completions in a non-foo. context:

• Use local completions first.
• Filter completions by meaning.

[mhegazy]

@sheetalkamat this looks related to your change to filter completions based on location. we probably should filter completions in a jsdoc comment between {} to types and namespaces only.