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ts: deep merge json serializable objects
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| function isObject(obj: any) { | |
| return typeof obj === "object" && obj !== null; | |
| } | |
| function isPlainObject(obj: any) { | |
| return Object.getPrototypeOf(obj).constructor === Object; | |
| } | |
| /** | |
| * used to deep merge json serializable objects. | |
| * skips undefined source values and empty array slots. | |
| */ | |
| export function merge(target: any, source: any) { | |
| if (isObject(target) && isObject(source)) { | |
| if (Array.isArray(source)) { | |
| source.forEach((item, i) => (target[i] = merge(target[i], item))); | |
| return target; | |
| } else if (isPlainObject(source)) { | |
| Object.keys(source).forEach( | |
| key => (target[key] = merge(target[key], source[key])) | |
| ); | |
| return target; | |
| } | |
| } | |
| return source !== void 0 ? source : target; | |
| } |
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