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import { FilterFn, find } from "../webpack";
import { React } from "../webpack/common";
import { proxyLazy } from "./proxyLazy";
/**
* 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 makeLazy<T>(factory: () => T): () => T {
let cache: T;
return () => cache ?? (cache = factory());
}
export const lazy = makeLazy;
/**
* Do a lazy webpack search. Searches the module on first property access
* @param filter Filter function
* @returns A proxy to the webpack module. Not all traps are implemented, may produce unexpected results.
*/
export function lazyWebpack<T = any>(filter: FilterFn): T {
return proxyLazy(() => find(filter));
}
/**
* 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 as any /* I hate react typings ??? */} />;
};
}
/**
* 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;
}
/**
* Join an array of strings in a human readable way (1, 2 and 3)
* @param elements Elements
*/
export function humanFriendlyJoin(elements: string[]): string;
/**
* Join an array of strings in a human readable way (1, 2 and 3)
* @param elements Elements
* @param mapper Function that converts elements to a string
*/
export function humanFriendlyJoin<T>(elements: T[], mapper: (e: T) => string): string;
export function humanFriendlyJoin(elements: any[], mapper: (e: any) => string = s => s): string {
const { length } = elements;
if (length === 0) return "";
if (length === 1) return mapper(elements[0]);
let s = "";
for (let i = 0; i < length; i++) {
s += mapper(elements[i]);
if (length - i > 2) s += ", ";
else if (length - i > 1) s += " and ";
}
return s;
}
/**
* Calls .join(" ") on the arguments
* classes("one", "two") => "one two"
*/
export function classes(...classes: string[]) {
return classes.join(" ");
}
export function sleep(ms: number): Promise<void> {
return new Promise(r => setTimeout(r, ms));
}
/**
* Wraps a Function into a try catch block and logs any errors caught
* Due to the nature of this function, not all paths return a result.
* Thus, for consistency, the returned functions will always return void or Promise<void>
*
* @param name Name identifying the wrapped function. This will appear in the logged errors
* @param func Function (async or sync both work)
* @param thisObject Optional thisObject
* @returns Wrapped Function
*/
export function suppressErrors<F extends Function>(name: string, func: F, thisObject?: any): F {
return (func.constructor.name === "AsyncFunction"
? async function (this: any) {
try {
await func.apply(thisObject ?? this, arguments);
} catch (e) {
console.error(`Caught an Error in ${name || "anonymous"}\n`, e);
}
}
: function (this: any) {
try {
func.apply(thisObject ?? this, arguments);
} catch (e) {
console.error(`Caught an Error in ${name || "anonymous"}\n`, e);
}
}) as any as F;
}
/**
* Wrap the text in ``` with an optional language
*/
export function makeCodeblock(text: string, language?: string) {
const chars = "```";
return `${chars}${language || ""}\n${text}\n${chars}`;
}
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