Use

Template variables are often used to pass data between components. <component-a> exports its propA value to the template variable scope.vars.variable. This is, in turn, used to update the value of propB in <component-b>.

<component-a propA:to="scope.vars.variable"/>
<component-b propB:from="scope.vars.variable"/>

Template variables are global to the template. Similar to JavaScript var variables, template variables do not have block level scope. The following does not work:

{{#each something}}
    <component-a propA:to="scope.vars.variable"/>
    <component-b propB:from="scope.vars.variable"/>
{{/each}}

To work around this, an localContext helper could be created as follows:

stache.registerHelper( "localContext", function( options ) {
    return options.fn( new Map() );
} );

And used like:

{{#each something}}
    {{#localContext}}
      <component-a propA:to="./variable"/>
      <component-b propB:from="./variable"/>
    {{/localContext}}
{{/each}}