Function traverse

packages/reactivity/src/watch.ts:333–369

(
  value: unknown,
  depth: number = Infinity,
  seen?: Map<unknown, number>,
)

}

export function traverse(
  value: unknown,
  depth: number = Infinity,
  seen?: Map<unknown, number>,
): unknown {
  if (depth <= 0 || !isObject(value) || (value as any)[ReactiveFlags.SKIP]) {
    return value
  }

  seen = seen || new Map()
  if ((seen.get(value) || 0) >= depth) {
    return value
  }
  seen.set(value, depth)
  depth--
  if (isRef(value)) {
    traverse(value.value, depth, seen)
  } else if (isArray(value)) {
    for (let i = 0; i < value.length; i++) {
      traverse(value[i], depth, seen)
    }
  } else if (isSet(value) || isMap(value)) {
    value.forEach((v: any) => {
      traverse(v, depth, seen)
    })
  } else if (isPlainObject(value)) {
    for (const key in value) {
      traverse(value[key], depth, seen)
    }
    for (const key of Object.getOwnPropertySymbols(value)) {
      if (Object.prototype.propertyIsEnumerable.call(value, key)) {
        traverse(value[key as any], depth, seen)
      }
    }
  }
  return value
}