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import { React } from "../webpack/common";
/**
* Makes a lazy function. On first call, the value is computed.
* On subsequent calls, the same computed value will be returned
* @param factory Factory function
*/
export function lazy<T>(factory: () => T): () => T {
let cache: T;
return () => {
return cache ?? (cache = factory());
};
}
/**
* Await a promise
* @param factory Factory
* @param fallbackValue The fallback value that will be used until the promise resolved
* @returns [value, error, isPending]
*/
export function useAwaiter<T>(factory: () => Promise<T>): [T | null, any, boolean];
export function useAwaiter<T>(factory: () => Promise<T>, fallbackValue: T): [T, any, boolean];
export function useAwaiter<T>(factory: () => Promise<T>, fallbackValue: T | null = null): [T | null, any, boolean] {
const [state, setState] = React.useState({
value: fallbackValue,
error: null as any,
pending: true
});
React.useEffect(() => {
let isAlive = true;
factory()
.then(value => isAlive && setState({ value, error: null, pending: false }))
.catch(error => isAlive && setState({ value: null, error, pending: false }));
return () => void (isAlive = false);
}, []);
return [state.value, state.error, state.pending];
};
/**
* A lazy component. The factory method is called on first render. For example useful
* for const Component = LazyComponent(() => findByDisplayName("...").default)
* @param factory Function returning a Component
* @returns Result of factory function
*/
export function LazyComponent<T = any>(factory: () => React.ComponentType<T>) {
return (props: T) => {
const Component = React.useMemo(factory, []);
return <Component {...props} />;
};
}
/**
* Recursively merges defaults into an object and returns the same object
* @param obj Object
* @param defaults Defaults
* @returns obj
*/
export function mergeDefaults<T>(obj: T, defaults: T): T {
for (const key in defaults) {
const v = defaults[key];
if (typeof v === "object" && !Array.isArray(v)) {
obj[key] ??= {} as any;
mergeDefaults(obj[key], v);
} else {
obj[key] ??= v;
}
}
return obj;
}
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