@sanity/form-builder
Version:
Sanity form builder
50 lines (49 loc) • 3.14 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.useAsync = useAsync;
var _react = _interopRequireDefault(require("react"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(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(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function _iterableToArrayLimit(arr, i) { var _i = null == arr ? null : "undefined" != typeof Symbol && arr[Symbol.iterator] || arr["@@iterator"]; if (null != _i) { var _s, _e, _x, _r, _arr = [], _n = !0, _d = !1; try { if (_x = (_i = _i.call(arr)).next, 0 === i) { if (Object(_i) !== _i) return; _n = !1; } else for (; !(_n = (_s = _x.call(_i)).done) && (_arr.push(_s.value), _arr.length !== i); _n = !0); } catch (err) { _d = !0, _e = err; } finally { try { if (!_n && null != _i.return && (_r = _i.return(), Object(_r) !== _r)) return; } finally { if (_d) throw _e; } } return _arr; } }
function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
/**
* Takes an async function and returns a [AsyncState<value>, callback] pair.
* Whenever the callback is invoked, a new AsyncState is returned.
* If the returned callback is called again before the previous callback has settled, the resolution of the previous one will be ignored, thus preventing race conditions.
* @param fn an async function that returns a value
* @param dependencies list of dependencies that will return a new [value, callback] pair
*/
function useAsync(fn, dependencies) {
var _React$useState = _react.default.useState(null),
_React$useState2 = _slicedToArray(_React$useState, 2),
state = _React$useState2[0],
setState = _React$useState2[1];
var lastId = _react.default.useRef(0);
var wrappedCallback = _react.default.useCallback(arg => {
var asyncId = ++lastId.current;
setState({
status: 'pending'
});
Promise.resolve().then(() => fn(arg)).then(res => {
if (asyncId === lastId.current) {
setState({
status: 'complete',
result: res
});
}
}, err => {
if (asyncId === lastId.current) {
setState({
status: 'error',
error: err
});
}
});
}, [fn, ...dependencies]);
return [state, wrappedCallback];
}