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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | 13x 2x 11x 5x 6x 8x 5x | import { isRecord } from '../guard';
import type { DeepPartial } from '../types';
function mergeValues(base: unknown, patch: unknown): unknown {
if (patch === undefined) {
return base;
}
if (!isRecord(base) || !isRecord(patch)) {
return patch;
}
return Object.fromEntries([
...Object.entries(base),
...Object.entries(patch).map(([key, value]) => [
key,
mergeValues(Object.hasOwn(base, key) ? base[key] : undefined, value),
]),
]);
}
/**
* Applies a partial patch to nested settings, such as saved preferences over the defaults: plain objects are
* merged at every depth, other values replace, `undefined` keeps. A `__proto__` key stays a plain property.
*
* @template T - The type of the settings.
* @param base - The complete object, such as the defaults.
* @param patch - The values to change.
* @returns A new object that shares the unchanged branches with `base`.
* @example
* deepMerge({ grid: { step: 10, isVisible: true } }, { grid: { isVisible: false } });
* // { grid: { step: 10, isVisible: false } }
*/
export function deepMerge<T extends object>(base: T, patch: DeepPartial<NoInfer<T>>): T {
// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion -- A DeepPartial<T> merged into a T is a T.
return mergeValues(base, patch) as T;
}
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