Function onDeferBlockCompletion

packages/core/src/defer/triggering.ts:580–585

* Registers cleanup functions for a defer block when the block has finished * fetching and rendering

(lDetails: LDeferBlockDetails, callback: VoidFunction)

 * fetching and rendering
 */
function onDeferBlockCompletion(lDetails: LDeferBlockDetails, callback: VoidFunction) {
  if (!Array.isArray(lDetails[ON_COMPLETE_FNS])) {
    lDetails[ON_COMPLETE_FNS] = [];
  }
  lDetails[ON_COMPLETE_FNS].push(callback);
}

/**
 * Determines whether specific trigger types should be attached during an instruction firing