simple-pure-utils
Version:
Funciones puras para manipulación de objetos, arreglos, promesas y observables
52 lines • 3.83 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.splitPromise = exports.toSyncPromise = exports.isSyncPromiseType = exports.syncPromiseValue = exports.isSyncPromise = void 0;
const split_1 = require("./split");
/**True si la promesa se resuelve síncronamente */
function isSyncPromise(x) {
return syncPromiseValue(x).status != "pending";
}
exports.isSyncPromise = isSyncPromise;
/**Devuelve un objeto con el valor de la promesa si es síncrona, si no, devuelve un objeto indicando que no se pudo obtener su valor*/
function syncPromiseValue(x) {
let sync = {
status: "pending"
};
x.then((x) => sync = {
value: x,
status: "resolved"
}, err => sync = {
error: err,
status: "error"
});
return sync;
}
exports.syncPromiseValue = syncPromiseValue;
/**Devuelve true si una implementación de Promise soporta resolución síncrona */
function isSyncPromiseType(promiseClass) {
return isSyncPromise(new promiseClass((resolve) => resolve(10)));
}
exports.isSyncPromiseType = isSyncPromiseType;
/**
* Devuelve una promesa que internamente almacena su valor una vez que fue resuelta, de tal manera que al resolverse de nuevo se resuleve de forma síncrona.
* Esto mejora el rendimiento bastante el rendimiento ya que se puede verificar de forma síncrona si la promesa ya esta resuelta (no se ocupa un estatus intermedio de "cargando")
* @param x Una promesa
*/
function toSyncPromise(x) {
if (isSyncPromise(x))
return x;
return new split_1.SyncPromise((resolve, reject) => x.then(resolve, reject));
}
exports.toSyncPromise = toSyncPromise;
/**Crea una nueva promesa y devuelve por separado la promesa y las funciones que resuelven y rechazan a la promesa */
function splitPromise() {
let resolve = null;
let reject = null;
const promise = new split_1.SyncPromise((onfulfilled, onrejected) => {
resolve = onfulfilled;
reject = onrejected;
});
return { promise, resolve, reject };
}
exports.splitPromise = splitPromise;
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