NODE_PENDING_DEPRECATION=1

新增于: v8.0.0

当设置为 1 时，触发挂起的弃用警告。

待弃用用于提供一种选择性的"早期警告"机制，开发者可以利用该机制来检测弃用的 API 的使用情况。

Added in: v8.0.0

When set to 1, emit pending deprecation warnings.

Pending deprecations are generally identical to a runtime deprecation with the notable exception that they are turned off by default and will not be emitted unless either the --pending-deprecation command line flag, or the NODE_PENDING_DEPRECATION=1 environment variable, is set. Pending deprecations are used to provide a kind of selective "early warning" mechanism that developers may leverage to detect deprecated API usage.