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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { deepClone } from './clone.js';
import type { Cloneable } from './clone.js';
type DeepPartial<T> = {
[P in keyof T]?: T[P] extends Record<string | number | symbol, unknown> ? DeepPartial<T[P]> : T[P];
};
function isPureObject(value: unknown): value is Record<string | number | symbol, unknown> {
return typeof value === 'object' && value !== null && !Array.isArray(value);
}
/**
* valueにないキーをdefからもらう（再帰的）\
* nullはそのまま、undefinedはdefの値
**/
export function deepMerge<X extends Record<string | number | symbol, unknown>>(value: DeepPartial<X>, def: X): X {
if (isPureObject(value) && isPureObject(def)) {
const result = deepClone(value as Cloneable) as X;
for (const [k, v] of Object.entries(def) as [keyof X, X[keyof X]][]) {
if (!Object.prototype.hasOwnProperty.call(value, k) || value[k] === undefined) {
result[k] = v;
} else if (isPureObject(v) && isPureObject(result[k])) {
const child = deepClone(result[k] as Cloneable) as DeepPartial<X[keyof X] & Record<string | number | symbol, unknown>>;
result[k] = deepMerge<typeof v>(child, v);
}
}
return result;
}
throw new Error('deepMerge: value and def must be pure objects');
}
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