Method addCleanupFn

packages/core/src/defer/registry.ts:82–89

(blockId: string, fn: Function)

  // we have to leave the lowest block Id in the registry
  // unless that block has no children
  addCleanupFn(blockId: string, fn: Function) {
    let cleanupFunctions: Function[] = [];
    if (this.cleanupFns.has(blockId)) {
      cleanupFunctions = this.cleanupFns.get(blockId)!;
    }
    cleanupFunctions.push(fn);
    this.cleanupFns.set(blockId, cleanupFunctions);
  }

  invokeTriggerCleanupFns(blockId: string) {
    const fns = this.cleanupFns.get(blockId) ?? [];