in src/legacy/react/reactive.ts [12:31]
function setPropAccessors<T>(props: any, selector: SelectorFunction<T>) {
let newProps: any = {};
Object.keys(props).forEach(key => {
newProps[key] = props[key];
});
Object.keys(selector).forEach((key: string) => {
let getter = selector[key as keyof T];
if (typeof newProps[key] === typeof undefined) {
Object.defineProperty(newProps, key, {
enumerable: true,
get: () => getter.call(null, newProps),
});
}
});
return newProps;
}