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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 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | 4x 56x 4x 36x 19x 19x 17x 17x 17x 20x 20x 20x 20x 20x 3x 17x 5x 5x 5x 12x 17x | import { DeepPartial } from '../types'
const isObject = (item: any): item is Record<string, any> => {
return item && typeof item === 'object' && !Array.isArray(item)
}
/**
* Deep merges two objects.
* properties in source override properties in target.
* Arrays are replaced, not concatenated (usually preferred for config).
*/
export const deepMerge = <T extends object>(target: T, ...sources: DeepPartial<T>[]): T => {
if (!sources.length) return target
// Merge the first source into target
const source = sources.shift()
if (!source) return deepMerge(target, ...sources)
const output = { ...target }
Eif (isObject(target) && isObject(source)) {
Object.keys(source).forEach((key) => {
const sourceKey = key as keyof typeof source
const targetKey = key as keyof typeof target
const sourceValue = source[sourceKey]
const targetValue = target[targetKey]
if (sourceValue === '' || sourceValue === null || sourceValue === undefined) {
// Skip empty strings, nulls, and undefined to support inheritance
// (source empty means fall back to target)
return
}
if (isObject(sourceValue)) {
Iif (!(sourceKey in target)) {
Object.assign(output, { [key]: sourceValue })
} else if (isObject(targetValue)) {
;(output as any)[key] = deepMerge(targetValue as object, sourceValue as any)
} else E{
Object.assign(output, { [key]: sourceValue })
}
} else {
Object.assign(output, { [key]: sourceValue })
}
})
}
// Recursively merge remaining sources
return deepMerge(output, ...sources)
}
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