@ngrx/effects
Version:
Side effect model for @ngrx/store
55 lines • 12.3 kB
JavaScript
import { defer, merge, Subject } from 'rxjs';
import { concatMap, dematerialize, filter, finalize, map, materialize, } from 'rxjs/operators';
/**
* Wraps project fn with error handling making it safe to use in Effects.
* Takes either a config with named properties that represent different possible
* callbacks or project/error callbacks that are required.
*/
export function act(
/** Allow to take either config object or project/error functions */
configOrProject, errorFn) {
const { project, error, complete, operator, unsubscribe } = typeof configOrProject === 'function'
? {
project: configOrProject,
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
error: errorFn,
operator: concatMap,
complete: undefined,
unsubscribe: undefined,
}
: { ...configOrProject, operator: configOrProject.operator || concatMap };
return (source) => defer(() => {
const subject = new Subject();
return merge(source.pipe(operator((input, index) => defer(() => {
let completed = false;
let errored = false;
let projectedCount = 0;
return project(input, index).pipe(materialize(), map((notification) => {
switch (notification.kind) {
case 'E':
errored = true;
return {
kind: 'N',
value: error(notification.error, input),
};
case 'C':
completed = true;
return complete
? {
kind: 'N',
value: complete(projectedCount, input),
}
: undefined;
default:
++projectedCount;
return notification;
}
}), filter((n) => n != null), dematerialize(), finalize(() => {
if (!completed && !errored && unsubscribe) {
subject.next(unsubscribe(projectedCount, input));
}
}));
}))), subject);
});
}
//# 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{ Action } from '@ngrx/store';\nimport { defer, merge, Observable, OperatorFunction, Subject } from 'rxjs';\nimport {\n  concatMap,\n  dematerialize,\n  filter,\n  finalize,\n  map,\n  materialize,\n} from 'rxjs/operators';\nimport { ObservableNotification } from './utils';\n\n/** Represents config with named parameters for act */\nexport interface ActConfig<\n  Input,\n  OutputAction extends Action,\n  ErrorAction extends Action,\n  CompleteAction extends Action,\n  UnsubscribeAction extends Action\n> {\n  // Project function that produces the output actions in success cases\n  project: (input: Input, index: number) => Observable<OutputAction>;\n  // Error handle function for project\n  // error that happened during project execution\n  // input value that project errored with\n  error: (error: any, input: Input) => ErrorAction;\n  // Optional complete action provider\n  // count is the number of actions project emitted before completion\n  // input value that project completed with\n  complete?: (count: number, input: Input) => CompleteAction;\n  // Optional flattening operator\n  operator?: <Input, OutputAction>(\n    project: (input: Input, index: number) => Observable<OutputAction>\n  ) => OperatorFunction<Input, OutputAction>;\n  // Optional unsubscribe action provider\n  // count is the number of actions project emitted before unsubscribing\n  // input value that was unsubscribed from\n  unsubscribe?: (count: number, input: Input) => UnsubscribeAction;\n}\n\nexport function act<\n  Input,\n  OutputAction extends Action,\n  ErrorAction extends Action\n>(\n  project: (input: Input, index: number) => Observable<OutputAction>,\n  error: (error: any, input: Input) => ErrorAction\n): (source: Observable<Input>) => Observable<OutputAction | ErrorAction>;\nexport function act<\n  Input,\n  OutputAction extends Action,\n  ErrorAction extends Action,\n  CompleteAction extends Action = never,\n  UnsubscribeAction extends Action = never\n>(\n  config: ActConfig<\n    Input,\n    OutputAction,\n    ErrorAction,\n    CompleteAction,\n    UnsubscribeAction\n  >\n): (\n  source: Observable<Input>\n) => Observable<\n  OutputAction | ErrorAction | CompleteAction | UnsubscribeAction\n>;\n/**\n * Wraps project fn with error handling making it safe to use in Effects.\n * Takes either a config with named properties that represent different possible\n * callbacks or project/error callbacks that are required.\n */\nexport function act<\n  Input,\n  OutputAction extends Action,\n  ErrorAction extends Action,\n  CompleteAction extends Action = never,\n  UnsubscribeAction extends Action = never\n>(\n  /** Allow to take either config object or project/error functions */\n  configOrProject:\n    | ActConfig<\n        Input,\n        OutputAction,\n        ErrorAction,\n        CompleteAction,\n        UnsubscribeAction\n      >\n    | ((input: Input, index: number) => Observable<OutputAction>),\n  errorFn?: (error: any, input: Input) => ErrorAction\n): (\n  source: Observable<Input>\n) => Observable<\n  OutputAction | ErrorAction | CompleteAction | UnsubscribeAction\n> {\n  const { project, error, complete, operator, unsubscribe } =\n    typeof configOrProject === 'function'\n      ? {\n          project: configOrProject,\n          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion\n          error: errorFn!,\n          operator: concatMap,\n          complete: undefined,\n          unsubscribe: undefined,\n        }\n      : { ...configOrProject, operator: configOrProject.operator || concatMap };\n\n  type ResultAction =\n    | OutputAction\n    | ErrorAction\n    | CompleteAction\n    | UnsubscribeAction;\n  return (source) =>\n    defer((): Observable<ResultAction> => {\n      const subject = new Subject<UnsubscribeAction>();\n      return merge(\n        source.pipe(\n          operator((input, index) =>\n            defer(() => {\n              let completed = false;\n              let errored = false;\n              let projectedCount = 0;\n              return project(input, index).pipe(\n                materialize(),\n                map(\n                  (\n                    notification\n                  ):\n                    | ObservableNotification<\n                        ErrorAction | CompleteAction | OutputAction\n                      >\n                    | undefined => {\n                    switch (notification.kind) {\n                      case 'E':\n                        errored = true;\n                        return {\n                          kind: 'N',\n                          value: error(notification.error, input),\n                        };\n                      case 'C':\n                        completed = true;\n                        return complete\n                          ? {\n                              kind: 'N',\n                              value: complete(projectedCount, input),\n                            }\n                          : undefined;\n                      default:\n                        ++projectedCount;\n                        return notification as ObservableNotification<OutputAction>;\n                    }\n                  }\n                ),\n                filter((n): n is NonNullable<typeof n> => n != null),\n                dematerialize(),\n                finalize(() => {\n                  if (!completed && !errored && unsubscribe) {\n                    subject.next(unsubscribe(projectedCount, input));\n                  }\n                })\n              );\n            })\n          )\n        ),\n        subject\n      );\n    });\n}\n"]}