Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 37 38 39 40 41 | 7x 6x 6x 9x 1x 8x 8x 8x 8x 1x 7x 7x 6x | /**
* シンプルなディープマージユーティリティ。
* 2026 Best Practice: 外部ライブラリへの依存を避け、必要な機能のみを軽量に実装。
* プロトタイプ汚染対策済みの安全な実装。
*/
export function deepMerge<T extends object>(
target: T,
source: Partial<T> | undefined,
): T {
if (!source) return target;
const output = { ...target } as Record<string, unknown>;
for (const key in source) {
// 2026 Best Practice: プロトタイプ汚染（__proto__, constructor, prototype）の防止
if (key === "__proto__" || key === "constructor" || key === "prototype") {
continue;
}
Eif (Object.prototype.hasOwnProperty.call(source, key)) {
const sourceValue = (source as Record<string, unknown>)[key];
const targetValue = (target as Record<string, unknown>)[key];
if (
sourceValue &&
typeof sourceValue === "object" &&
!Array.isArray(sourceValue) &&
targetValue &&
typeof targetValue === "object" &&
!Array.isArray(targetValue)
) {
output[key] = deepMerge(targetValue as object, sourceValue as object);
} else if (EsourceValue !== undefined) {
output[key] = sourceValue;
}
}
}
return output as T;
}
|