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import { purry } from './purry';
type FlattenDeep<T> = T extends ReadonlyArray<infer K> ? FlattenDeep2<K> : T;
type FlattenDeep2<T> = T extends ReadonlyArray<infer K> ? FlattenDeep3<K> : T;
type FlattenDeep3<T> = T extends ReadonlyArray<infer K> ? FlattenDeep4<K> : T;
type FlattenDeep4<T> = T extends ReadonlyArray<infer K> ? K : T;
/**
* Recursively flattens `array`.
* Note: In `pipe`, use `flattenDeep()` form instead of `flattenDeep`. Otherwise, the inferred type is lost.
* @param items the target array
* @signature P.flattenDeep(array)
* @example
* P.flattenDeep([[1, 2], [[3], [4, 5]]]) // => [1, 2, 3, 4, 5]
* P.pipe(
* [[1, 2], [[3], [4, 5]]],
* P.flattenDeep(),
* ); // => [1, 2, 3, 4, 5]
* @category Array
* @pipeable
*/
export function flattenDeep<T>(items: readonly T[]): Array<FlattenDeep<T>>;
export function flattenDeep<T>(): (
items: readonly T[]
) => Array<FlattenDeep<T>>;
export function flattenDeep() {
return purry(_flattenDeep, arguments, flattenDeep.lazy);
}
function _flattenDeep<T>(items: Array<T>): Array<FlattenDeep<T>> {
return _reduceLazy(items, flattenDeep.lazy());
}
function _flattenDeepValue<T>(value: T | Array<T>): T | Array<FlattenDeep<T>> {
if (!Array.isArray(value)) {
return value;
}
const ret: any[] = [];
value.forEach(item => {
if (Array.isArray(item)) {
ret.push(...flattenDeep(item));
} else {
ret.push(item);
}
});
return ret;
}
export namespace flattenDeep {
export function lazy() {
return (value: any): LazyResult<any> => {
const next = _flattenDeepValue(value);
if (Array.isArray(next)) {
return {
done: false,
hasNext: true,
hasMany: true,
next: next,
};
}
return {
done: false,
hasNext: true,
next,
};
};
}
}
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