@npio/internals/src/server/util/object.ts

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import { isPlainObject } from "moderndash";

export const merge = <T extends {}, S extends {}>(
  target: T,
  ...sources: S[]
): T & S => {
  const copy = { ...target } as any;
  for (const source of sources) {
    for (let [k, v] of Object.entries(source)) {
      if (v == null) continue;
      if (isPlainObject(v)) {
        v = merge(isPlainObject(copy[k]) ? copy[k] : {}, v);
      }
      copy[k] = v as any;
    }
  }

  return copy;
};