addonBlueprintLookupPaths() {
    let addonPaths = this.addons
      .reduce((sum, addon) => {
        if (addon.blueprintsPath) {
          let val = addon.blueprintsPath();
          if (val) {
            sum.push(val);
          }
        }
        return sum;
      }, [])
      .reverse();

    return addonPaths;
  }
Returns a list of addon paths where blueprints will be looked up.

    @private
    @method addonBlueprintLookupPaths
    @return {Array} List of paths