@yoroi/common
Version:
The Common package of Yoroi SDK
39 lines (38 loc) • 2.49 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.useObservableValue = useObservableValue;
var React = _interopRequireWildcard(require("react"));
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
/**
* For some reason `React.useSyncExternalStore` is not working properly
* **please remember to pass a stable `executor` to avoid re-renderings** e.g `React.useCallback...`
*
* **ATTENTION** useObservableValue was designed to mimic `useSyncExternalStore`
* the executor should read the data from the source and not from the event
* so basically it means -> something changes, please updated with the latest data
*
* **NOTE** if the data from the event is desired to perform some action, please subscribe directly
* and don't use this hook
*
* **NOTE** be mindful that if the observer is a behavior subject, the hook will update twice when mounting
* 1st on the value intialization and
* 2nd after subscribing to the observable (cuz it will emit the last value, when present)
*/
function useObservableValue(_ref) {
let {
observable$,
getter
} = _ref;
const [value, setValue] = React.useState(getter());
React.useEffect(() => {
const subscription = observable$.subscribe(() => {
setValue(() => getter());
});
return () => subscription.unsubscribe();
}, [getter, observable$]);
return value;
}
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