@apollo/client
Version:
A fully-featured caching GraphQL client.
74 lines • 2.81 kB
JavaScript
import { __spreadArray } from "tslib";
// Take an observable and N callbacks, and observe the observable,
// ensuring it is called exactly N times, resolving once it has done so.
// Optionally takes a timeout, which it will wait X ms after the Nth callback
// to ensure it is not called again.
export function observableToPromiseAndSubscription(_a) {
var observable = _a.observable, _b = _a.shouldResolve, shouldResolve = _b === void 0 ? true : _b, _c = _a.wait, wait = _c === void 0 ? -1 : _c, _d = _a.errorCallbacks, errorCallbacks = _d === void 0 ? [] : _d;
var cbs = [];
for (var _i = 1; _i < arguments.length; _i++) {
cbs[_i - 1] = arguments[_i];
}
var subscription = null;
var promise = new Promise(function (resolve, reject) {
var errorIndex = 0;
var cbIndex = 0;
var results = [];
var tryToResolve = function () {
if (!shouldResolve) {
return;
}
var done = function () {
subscription.unsubscribe();
// XXX: we could pass a few other things out here?
resolve(results);
};
if (cbIndex === cbs.length && errorIndex === errorCallbacks.length) {
if (wait === -1) {
done();
}
else {
setTimeout(done, wait);
}
}
};
var queue = Promise.resolve();
subscription = observable.subscribe({
next: function (result) {
queue = queue
.then(function () {
var cb = cbs[cbIndex++];
if (cb)
return cb(result);
reject(new Error("Observable 'next' method called more than ".concat(cbs.length, " times")));
})
.then(function (res) {
results.push(res);
tryToResolve();
}, reject);
},
error: function (error) {
queue = queue
.then(function () {
var errorCb = errorCallbacks[errorIndex++];
if (errorCb)
return errorCb(error);
reject(error);
})
.then(tryToResolve, reject);
},
});
});
return {
promise: promise,
subscription: subscription,
};
}
export default function (options) {
var cbs = [];
for (var _i = 1; _i < arguments.length; _i++) {
cbs[_i - 1] = arguments[_i];
}
return observableToPromiseAndSubscription.apply(void 0, __spreadArray([options], cbs, false)).promise;
}
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