typeorm
Version:
Data-Mapper ORM for TypeScript, ES7, ES6, ES5. Supports MySQL, PostgreSQL, MariaDB, SQLite, MS SQL Server, Oracle, MongoDB databases.
63 lines (61 loc) • 2.32 kB
JavaScript
/**
* Utils to help to work with Promise objects.
*/
var PromiseUtils = /** @class */ (function () {
function PromiseUtils() {
}
/**
* Creates a new promise with resolved value used for lazy relations.
*/
PromiseUtils.create = function (value) {
var promise = Promise.resolve(value);
promise["__value__"] = value;
return promise;
};
/**
* If given value is a promise created by "create" method this method gets its value.
* If given value is not a promise then given value is returned back.
*/
PromiseUtils.extractValue = function (object) {
if (object instanceof Promise && object["__value__"])
return object["__value__"];
return object;
};
/**
* Runs given callback that returns promise for each item in the given collection in order.
* Operations executed after each other, right after previous promise being resolved.
*/
PromiseUtils.runInSequence = function (collection, callback) {
var results = [];
return collection.reduce(function (promise, item) {
return promise.then(function () {
return callback(item);
}).then(function (result) {
results.push(result);
});
}, Promise.resolve()).then(function () {
return results;
});
};
/**
* Returns a promise that is fulfilled with an array of promise state snapshots,
* but only after all the original promises have settled, i.e. become either fulfilled or rejected.
*/
PromiseUtils.settle = function (promises) {
return Promise.all(promises.map(function (p) { return Promise.resolve(p).then(function (v) { return ({
state: "fulfilled",
value: v,
}); }, function (r) { return ({
state: "rejected",
reason: r,
}); }); })).then(function (results) {
var rejected = results.find(function (result) { return result.state === "rejected"; });
if (rejected)
return Promise.reject(rejected.reason);
return results.map(function (result) { return result.value; });
});
};
return PromiseUtils;
}());
export { PromiseUtils };
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