on-one
Version:
Subscribe to one or more events and accept the first emitted
70 lines • 2.89 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "default", {
enumerable: true,
get: function() {
return onOne;
}
});
function _array_like_to_array(arr, len) {
if (len == null || len > arr.length) len = arr.length;
for(var i = 0, arr2 = new Array(len); i < len; i++)arr2[i] = arr[i];
return arr2;
}
function _array_without_holes(arr) {
if (Array.isArray(arr)) return _array_like_to_array(arr);
}
function _iterable_to_array(iter) {
if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter);
}
function _non_iterable_spread() {
throw new TypeError("Invalid attempt to spread non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _to_consumable_array(arr) {
return _array_without_holes(arr) || _iterable_to_array(arr) || _unsupported_iterable_to_array(arr) || _non_iterable_spread();
}
function _unsupported_iterable_to_array(o, minLen) {
if (!o) return;
if (typeof o === "string") return _array_like_to_array(o, minLen);
var n = Object.prototype.toString.call(o).slice(8, -1);
if (n === "Object" && o.constructor) n = o.constructor.name;
if (n === "Map" || n === "Set") return Array.from(n);
if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _array_like_to_array(o, minLen);
}
var isArray = Array.isArray || function(x) {
return Object.prototype.toString.call(x) === '[object Array]';
};
function onOne(emitter, nameOrNames, fn) {
var names = isArray(nameOrNames) ? nameOrNames : [
nameOrNames
];
var called = false;
var wrappers = [];
names.forEach(function(name) {
var wrapper = function wrapper() {
for(var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++){
args[_key] = arguments[_key];
}
if (called) return;
called = true;
// cleanup
for(var i = 0; i < names.length; i++){
emitter.removeListener(names[i], wrappers[i]);
}
// error-first callback: 'error' event passes error as first arg, others pass null
if (name === 'error') {
return fn(args[0], name);
}
return fn.apply(void 0, [
null
].concat(_to_consumable_array(args), [
name
]));
};
wrappers.push(wrapper);
emitter.on(name, wrapper);
});
}
/* CJS INTEROP */ if (exports.__esModule && exports.default) { try { Object.defineProperty(exports.default, '__esModule', { value: true }); for (var key in exports) { exports.default[key] = exports[key]; } } catch (_) {}; module.exports = exports.default; }