Intlayer

import { DestroyRef, inject } from '@angular/core'; type AnyFn = (...args: any[]) => any; export type SharedComposableReturn<T extends AnyFn = AnyFn> = T; /** * Angular replacement for Vue's tryOnScopeDispose * Uses Angular's DestroyRef to handle cleanup when the injection context is destroyed */ export function tryOnScopeDispose(fn: () => void) { try { const destroyRef = inject(DestroyRef, { optional: true }); if (destroyRef) { destroyRef.onDestroy(fn); return true; } return false; } catch { // If called outside injection context, return false return false; } } /** * Angular equivalent of Vue's createSharedComposable * Creates a singleton pattern for services/composables */ export const createSharedComposable = <Fn extends AnyFn>( composable: Fn ): SharedComposableReturn<Fn> => { let subscribers = 0; let state: ReturnType<Fn> | undefined; let cleanupFn: (() => void) | undefined; const dispose = () => { subscribers -= 1; if (cleanupFn && subscribers <= 0) { cleanupFn(); state = undefined; cleanupFn = undefined; } }; return <Fn>((...args) => { subscribers += 1; if (!state) { state = composable(...args); // Set up cleanup when the first subscriber is destroyed if (tryOnScopeDispose(dispose)) { cleanupFn = dispose; } } else { // For additional subscribers, just set up their individual cleanup tryOnScopeDispose(dispose); } return state; }); };