funcunit/site/node_modules/can/view/mustache/doc/key.md

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@typedef {String} can.mustache.key key
@parent can.mustache.types

A key references a value within the current [can.mustache.context context] of a 
template being rendered. In the following example, the 
key is `name`:

    <h1>{{name}}</h1>
    
If this template is rendered with:

    {
      name: "Austin"
    }

The template writes out:

    <h1>Austin</h1>