@uirouter/core/lib/hooks/lazyLoad.js.map

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  "sourcesContent": [
    "import { Transition } from '../transition/transition';\nimport { TransitionService } from '../transition/transitionService';\nimport { TransitionHookFn } from '../transition/interface';\nimport { StateDeclaration, LazyLoadResult } from '../state/interface';\nimport { services } from '../common/coreservices';\nimport { StateRule } from '../url/interface';\n\n/**\n * A [[TransitionHookFn]] that performs lazy loading\n *\n * When entering a state \"abc\" which has a `lazyLoad` function defined:\n * - Invoke the `lazyLoad` function (unless it is already in process)\n *   - Flag the hook function as \"in process\"\n *   - The function should return a promise (that resolves when lazy loading is complete)\n * - Wait for the promise to settle\n *   - If the promise resolves to a [[LazyLoadResult]], then register those states\n *   - Flag the hook function as \"not in process\"\n * - If the hook was successful\n *   - Remove the `lazyLoad` function from the state declaration\n * - If all the hooks were successful\n *   - Retry the transition (by returning a TargetState)\n *\n * ```\n * .state('abc', {\n *   component: 'fooComponent',\n *   lazyLoad: () => import('./fooComponent')\n *   });\n * ```\n *\n * See [[StateDeclaration.lazyLoad]]\n */\nconst lazyLoadHook: TransitionHookFn = (transition: Transition) => {\n  const router = transition.router;\n\n  function retryTransition() {\n    if (transition.originalTransition().options().source !== 'url') {\n      // The original transition was not triggered via url sync\n      // The lazy state should be loaded now, so re-try the original transition\n      const orig = transition.targetState();\n      return router.stateService.target(orig.identifier(), orig.params(), orig.options());\n    }\n\n    // The original transition was triggered via url sync\n    // Run the URL rules and find the best match\n    const $url = router.urlService;\n    const result = $url.match($url.parts());\n    const rule = result && result.rule;\n\n    // If the best match is a state, redirect the transition (instead\n    // of calling sync() which supersedes the current transition)\n    if (rule && rule.type === 'STATE') {\n      const state = (rule as StateRule).state;\n      const params = result.match;\n      return router.stateService.target(state, params, transition.options());\n    }\n\n    // No matching state found, so let .sync() choose the best non-state match/otherwise\n    router.urlService.sync();\n  }\n\n  const promises = transition\n    .entering()\n    .filter((state) => !!state.$$state().lazyLoad)\n    .map((state) => lazyLoadState(transition, state));\n\n  return services.$q.all(promises).then(retryTransition);\n};\n\nexport const registerLazyLoadHook = (transitionService: TransitionService) =>\n  transitionService.onBefore({ entering: (state) => !!state.lazyLoad }, lazyLoadHook);\n\n/**\n * Invokes a state's lazy load function\n *\n * @param transition a Transition context\n * @param state the state to lazy load\n * @returns A promise for the lazy load result\n */\nexport function lazyLoadState(transition: Transition, state: StateDeclaration): Promise<LazyLoadResult> {\n  const lazyLoadFn = state.$$state().lazyLoad;\n\n  // Store/get the lazy load promise on/from the hookfn so it doesn't get re-invoked\n  let promise = lazyLoadFn['_promise'];\n  if (!promise) {\n    const success = (result) => {\n      delete state.lazyLoad;\n      delete state.$$state().lazyLoad;\n      delete lazyLoadFn['_promise'];\n      return result;\n    };\n\n    const error = (err) => {\n      delete lazyLoadFn['_promise'];\n      return services.$q.reject(err);\n    };\n\n    promise = lazyLoadFn['_promise'] = services.$q\n      .when(lazyLoadFn(transition, state))\n      .then(updateStateRegistry)\n      .then(success, error);\n  }\n\n  /** Register any lazy loaded state definitions */\n  function updateStateRegistry(result: LazyLoadResult) {\n    if (result && Array.isArray(result.states)) {\n      result.states.forEach((_state) => transition.router.stateRegistry.register(_state));\n    }\n    return result;\n  }\n\n  return promise;\n}\n"
  ]
}