54 lines
1.1 KiB
JavaScript
54 lines
1.1 KiB
JavaScript
var Promise = require('native-promise-only');
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module.exports = Deferred;
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function Deferred() {
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if (!(this instanceof Deferred)) {
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return new Deferred();
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}
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var self = this;
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this.promise = new Promise(function (resolve, reject) {
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self.resolve = resolve;
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self.reject = reject;
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});
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};
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Deferred.Promise = Promise;
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Deferred.prototype.nodeify = function (cb, opts) {
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if (typeof opts === 'undefined') {
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opts = { spread: false };
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}
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if (typeof cb === 'function') {
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this.promise
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.then(function (val) {
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var args;
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if (opts.spread && Array.isArray(val)) {
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args = val;
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args.unshift(null);
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} else {
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args = [null, val];
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}
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cb.apply(null, args);
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})
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.catch(function (err) {
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cb(err);
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});
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} else {
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return this.promise;
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}
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};
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Deferred.prototype.resolver = function () {
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var self = this;
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return function (err, results) {
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var args = Array.prototype.slice.call(arguments);
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if (err) {
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return self.reject(err);
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}
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args.shift(); // drop err
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self.resolve(args.length === 1 ? args[0] : args);
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};
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};
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function noop() {}
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