Yield computed properties in link-to component

[sukima]

This would allow greater flexibility and support for some CSS frameworks and situations where the link-to needs more than one element. For example:

{{#link-to "my-route" tagName="li" as |link|}}
  <a href={{link.href}} class="{{link.active}}">Link Title</a>
{{/link-to}}

Or even more complex ideas:

{{#link-to "my-route" tagName="li" as |link|}}
  {{#if link.active}}
    <span class="red">Current Route</span>
  {{else}}
    <a href={{link.href}}>Link Title</a>
  {{/if}}
{{/link-to}}

[snewcomer]

@sukima This is cool! I wonder if this could use a test in link-to-test.js? What do you think?

[locks]

This introduces new public API, so it necessitates an RFC.

[sukima]

• Related RFC
• Outdated PR

[mmun]

I'm closing this issue in light of emberjs/rfcs#275 (comment).

I still strongly encourage people to continue exploring this space in addons and in discussion issues on the RFC repo.