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import _extends from "@babel/runtime/helpers/esm/extends"; export function isPlainObject(item) { return item !== null && typeof item === 'object' && item.constructor === Object; } function deepClone(source) { if (!isPlainObject(source)) { return source; } const output = {}; Object.keys(source).forEach(key => { output[key] = deepClone(source[key]); }); return output; } export default function deepmerge(target, source, options = { clone: true }) { const output = options.clone ? _extends({}, target) : target; if (isPlainObject(target) && isPlainObject(source)) { Object.keys(source).forEach(key => { // Avoid prototype pollution if (key === '__proto__') { return; } if (isPlainObject(source[key]) && key in target && isPlainObject(target[key])) { // Since `output` is a clone of `target` and we have narrowed `target` in this block we can cast to the same type. output[key] = deepmerge(target[key], source[key], options); } else if (options.clone) { output[key] = isPlainObject(source[key]) ? deepClone(source[key]) : source[key]; } else { output[key] = source[key]; } }); } return output; }