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import {IterableElement, Promisable} from 'type-fest';
export function pSomeFunction<
List extends Iterable<unknown>,
Element extends IterableElement<List>,
>(
iterable: List,
predicate: (value: Element) => Promisable<boolean>,
): Promisable<boolean> {
const promises: Array<PromiseLike<boolean>> = [];
// Prioritize sync functions and early returns
for (const item of iterable) {
const result = predicate(item as Element);
if (typeof result === 'boolean') {
if (result) {
// Early sync return on the first truthy value
return true;
}
} else {
promises.push(result);
}
}
if (promises.length === 0) {
// Matches `[].some(Boolean)`
return false;
}
return pSome(promises);
}
export async function pSome(iterable: Iterable<PromiseLike<unknown>>): Promise<boolean> {
return new Promise(resolve => {
for (const promise of iterable) {
(async () => {
if (await promise) {
resolve(true);
}
})();
}
void Promise.allSettled(iterable).then(() => {
resolve(false);
});
});
}
export function pEveryFunction<
List extends Iterable<unknown>,
Element extends IterableElement<List>,
>(
iterable: List,
predicate: (value: Element) => Promisable<boolean>,
): Promisable<boolean> {
const promises: Array<PromiseLike<boolean>> = [];
// Prioritize sync functions and early returns
for (const item of iterable) {
const result = predicate(item as Element);
if (typeof result === 'boolean') {
if (!result) {
// Early sync return on the first falsy value
return false;
}
} else {
promises.push(result);
}
}
if (promises.length === 0) {
// Matches `[].every(Boolean)`
return true;
}
return pEvery(promises);
}
export async function pEvery(iterable: Iterable<PromiseLike<unknown>>): Promise<boolean> {
const results = await Promise.all(iterable);
return results.every(Boolean);
}
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