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3.4 KiB
{"version":3,"file":"asyncMap.js","sourceRoot":"","sources":["../../../src/utilities/observables/asyncMap.ts"],"names":[],"mappings":"AACA,OAAO,EAAE,UAAU,EAAE,MAAM,iBAAiB,CAAC;AAE7C,sEAAsE;AACtE,6CAA6C;AAC7C,MAAM,UAAU,QAAQ,CACtB,UAAyB,EACzB,KAAuC,EACvC,OAA4C;IAE5C,OAAO,IAAI,UAAU,CAAI,UAAC,QAAQ;QAChC,IAAI,YAAY,GAAG;YACjB,sEAAsE;YACtE,sEAAsE;YACtE,2CAA2C;YAC3C,IAAI,YAAC,QAAmB;gBACtB,OAAO,IAAI,OAAO,CAAC,UAAC,OAAO,IAAK,OAAA,OAAO,CAAC,QAAQ,EAAE,CAAC,EAAnB,CAAmB,CAAC,CAAC;YACvD,CAAC;SACe,CAAC;QAEnB,SAAS,YAAY,CACnB,QAAuC,EACvC,GAAqB;YAErB,OAAO,UAAC,GAAG;gBACT,IAAI,QAAQ,EAAE,CAAC;oBACb,IAAM,IAAI,GAAG;wBACX,mEAAmE;wBACnE,4DAA4D;wBAC5D,OAAA,QAAQ,CAAC,MAAM,CAAC,CAAC;4BACf,uBAAuB,CAAE,CAAS;4BACpC,CAAC,CAAC,QAAQ,CAAC,GAAG,CAAC;oBAFf,CAEe,CAAC;oBAElB,YAAY,GAAG,YAAY,CAAC,IAAI,CAAC,IAAI,EAAE,IAAI,CAAC,CAAC,IAAI,CAC/C,UAAC,MAAM,IAAK,OAAA,QAAQ,CAAC,IAAI,CAAC,MAAM,CAAC,EAArB,CAAqB,EACjC,UAAC,KAAK,IAAK,OAAA,QAAQ,CAAC,KAAK,CAAC,KAAK,CAAC,EAArB,CAAqB,CACjC,CAAC;gBACJ,CAAC;qBAAM,CAAC;oBACN,QAAQ,CAAC,GAAG,CAAC,CAAC,GAAG,CAAC,CAAC;gBACrB,CAAC;YACH,CAAC,CAAC;QACJ,CAAC;QAED,IAAM,OAAO,GAAgB;YAC3B,IAAI,EAAE,YAAY,CAAC,KAAK,EAAE,MAAM,CAAC;YACjC,KAAK,EAAE,YAAY,CAAC,OAAO,EAAE,OAAO,CAAC;YACrC,QAAQ;gBACN,iEAAiE;gBACjE,mEAAmE;gBACnE,mBAAmB,CAAC,YAAY,CAAC,IAAI,CAAC,cAAM,OAAA,QAAQ,CAAC,QAAQ,EAAE,EAAnB,CAAmB,CAAC,CAAC;YACnE,CAAC;SACF,CAAC;QAEF,IAAM,GAAG,GAAG,UAAU,CAAC,SAAS,CAAC,OAAO,CAAC,CAAC;QAC1C,OAAO,cAAM,OAAA,GAAG,CAAC,WAAW,EAAE,EAAjB,CAAiB,CAAC;IACjC,CAAC,CAAC,CAAC;AACL,CAAC","sourcesContent":["import type { Observer } from \"./Observable.js\";\nimport { Observable } from \"./Observable.js\";\n\n// Like Observable.prototype.map, except that the mapping function can\n// optionally return a Promise (or be async).\nexport function asyncMap<V, R>(\n observable: Observable<V>,\n mapFn: (value: V) => R | PromiseLike<R>,\n catchFn?: (error: any) => R | PromiseLike<R>\n): Observable<R> {\n return new Observable<R>((observer) => {\n let promiseQueue = {\n // Normally we would initialize promiseQueue to Promise.resolve(), but\n // in this case, for backwards compatibility, we need to be careful to\n // invoke the first callback synchronously.\n then(callback: () => any) {\n return new Promise((resolve) => resolve(callback()));\n },\n } as Promise<void>;\n\n function makeCallback(\n examiner: typeof mapFn | typeof catchFn,\n key: \"next\" | \"error\"\n ): (arg: any) => void {\n return (arg) => {\n if (examiner) {\n const both = () =>\n // If the observer is closed, we don't want to continue calling the\n // mapping function - it's result will be swallowed anyways.\n observer.closed ?\n /* will be swallowed */ (0 as any)\n : examiner(arg);\n\n promiseQueue = promiseQueue.then(both, both).then(\n (result) => observer.next(result),\n (error) => observer.error(error)\n );\n } else {\n observer[key](arg);\n }\n };\n }\n\n const handler: Observer<V> = {\n next: makeCallback(mapFn, \"next\"),\n error: makeCallback(catchFn, \"error\"),\n complete() {\n // no need to reassign `promiseQueue`, after `observer.complete`,\n // the observer will be closed and short-circuit everything anyways\n /*promiseQueue = */ promiseQueue.then(() => observer.complete());\n },\n };\n\n const sub = observable.subscribe(handler);\n return () => sub.unsubscribe();\n });\n}\n"]} |